The Crescent Nebula

This object is a splatter of red and blue paint flung out from a seething star. Here, the hot star's shed atmosphere is lit up by it's ultraviolet light and fluoresces in hydrogen light. The star is the 7.4 magnitude Wolf-Rayet star, PPM 84423 in the constellation of Cygnus. Just before I slotted the camera into the scope I got a stunning view of this strange arc. I used a 20mm wide-field eyepiece with a Lumicon Ultra High Contrast filter on the 20" telescope (f=2400mm). However, I didn't see the lovely colours shown here. The picture is 9 stacked 30 second exposures, plus flats and darks and the object is called NGC 6888, or the Crescent Nebula. I managed to dismantle my field flattener and insert the lenses into my camera adaptor to convert the f/4.8 scope into an f/3 scope a.k.a a 'light bucket'! The nebula can be found by aiming 1/3 of the way between the bright stars Sadr and Eta Cygni, and moving a tiny bit right. Look for the little W or M - the bright stars you can see in the lower portion of this picture.

Deeper still

Here's the latest 82 images of Gyulbudaghian's Variable nebula stacked with a more carefully taken flat field. Just thought I'd share it with you. Look around the red star PV Cephei in the dark 'hollow' at the centre - can you see a jet shooting out below and slightly to the right? This is the nebula I'm looking for - not the vast billowing clouds swallowing up the stars at the left. It's madly overexposed as I couldn't resist turning up the contrast!

Obscure Nebula - looking deeper

We had compared our images of Gyulbudaghian's Variable Nebula (HH 215, GM 1-29) and neither of us could see anything definate. It was the last deep-sky night for a fortnight as the moon was setting at 11pm as a distorted deep orange almond sinking behind the horizon. So, I was inspired to take another good bunch of 30" pics. All in all, I stacked 46 (including the previous pictures - below) to get a total exposure of over 25 minutes at f/4.8 on the 20" telescope. Here is the result. This picture is improved enough for you to see the Herbig-Haro jet HH 415 and the background nebulosity is clearer. HH 415 can be found by going below and slightly left of the bright blue star right of centre to find a bright-looking 13th magnitude star. There is a very faint star just below this and the object is the small streaky blur just below that. As for the main object around PV Cephei (just below centre), I still can't really see much there. With this picture, I increased the saturation, as it had somehow dropped during processing. So now the colours of the stars are revealed and they are stunning! This is especially useful on PV Cephei, which is clearly revealed to be a dim red colour, sitting in its dark patch of nebulous dust. Who knows what magnitude it's at now!?

The Helix Nebula

Contrary to what I've seen written, the Helix nebula is not the closest planetary nebula to us. It is one of my favourite objects but it is quite elusive, as it can only been seen at certain times under good conditions from UK and I had a good window of opportunity the other night. I took several shots, about 60 in all I think, 45 of which were good enough to stack (22x30",22x15" + 1'). The main trouble is that the nebula is so diffuse, it was barely visible on the individual pictures because of LIGHT POLLUTION! The worst culprits round here seem to be rural industry and carelessly aimed, wasteful and unnecessary security lights. So, to combat this, I stuck in a 40mm eyepiece on the 20" (60x) with a Lumicon UHC filter screwed on and the detail in the helix's structure was amazing and the centre of the nebula was filled in with a cool blue glow. I've done a lot of careful processing on the final image, as the flat fields were not as flat as I'd have liked (I took them on a white door indoors). It still looks quite noisy I think, but it's a beautiful object that I've been waiting a long while to photograph this well.

Gyulbudaghian's Variable Nebula

In this picture of Gyulbudaghian's nebula, North is down. It was ~ 8 mins worth of exposure on the 20" scope nearly overhead (5x1' + 6x30" + 17"). The nebula, which was discovered to be variable in 1977, has been very, very faint recently. The white lines point to the star PV Cephei, which is also faint. If you compare it to a previous image you will wonder what has happened to it... Strange star! (image courtesy STSci)

M19, the elongated globular cluster

Just a quick post to keep the blog ticking over. M19... A curiously elongated globular. One of my sharper images on the 20", but still a but fuzzy. I had to play around with the colour, as Deep Sky Stacker decided to give the midtones a green tinge when it stacked the pics. If I remember right, this was about 10 x 15 second shots on the 20", when it was tracking well, with darks and a flat. As far as globulars go this one is very close to and slightly further away than the centre of the galaxy, and we're looking at it through a plethora of distant stars and a bit of dust. It's an impressively big and bright cluster and it can be seen in binoculars at magnitude 6.8 in the constellation Ophiuchus. But why is it elongated? My instinct tells me it's tidal forces from the centre of the galaxy, but that's pure speculation.

Polar Mesospheric Clouds a long way South

On our observatory meeting night, we were treated to the usual clouding over and sprinkling of rain, while we were inside chatting. I was upstars in the dome, hoping we would be able to see a star or have something to point the scope at. We were watching a clear patch start to roll over revealing the twlinkly red star Antares and there were some cirrus-like clouds appearing right across the sky as the twlilight was fading at about 22:00 BST. I presumed they were cirrus but as the sky grew darker I realised they had some wonderful wave like patterns in them, and they continued to stand out from the darkening sky. They were Noctilucent clouds, covering the whole sky at 52 degrees North! I ran to the car while they faded to fetch my Canon 350D and took a few shots with it resting on a chair seat on the observatory roof, pointing NW. This particular shot taken at 22:36 on 15/07/09 is 1/5 second at ISO 1600, f/5.6 and about 35mm focal length (48mm @ 35mm-equivalent) with auto dark subtraction on. I continued at 4 seconds and ISO 100 thereafter for better noise, but the composition and scale of this earlier display looked the most impressive.

What was in front of the Space Station?

The Shuttle mission STS-127 has been delayed several days by bad weather, so what was the mystery object 30 seconds ahead of the International Space Station when it flew over Southern Britain at 23:07 UT(GMT) on 12/07/2009? Quite bright, it is clearly in the same orbit because the trails just appear to touch on this 30 second picture, as they did in the consecutive pictures. Take a look as it passed below Arcturus, viewed from just North of Norwich. Remember the light from the satellite has been spread out across its path and the ISS appeared much brighter than Arcturus.

Messier mosaic

Here is a 4x3 snippet of my new Messier object mosaic. Each picture is a 300x300 pixel image I have taken of the object. Some are awfully low in altitude from 52ºN. It's surprising how different each image is. Each have their own image processing challenges, whether it is light pollution subtraction, bringing out faint spiral arms, or eliminating the blurry disc effect on the small globular clusters. I learned that not all globulars look alike, and they all look impressive with a 20" scope. I used different magnifications for different objects, e.g. M24 in Sagittarius is huge! I have arranged my mosaic as 11 rows of 10, so each column ends in the same digit - but it's not complete. Here is a complete section so you can guess what columns and rows I have shown - if your astronomy knowledge is up to it, that is!

My best shot of Pluto yet

Pluto still has a place in our mind as a planet, but it's just too small. Smaller than the moon, a little bit brighter, but about 12,000 times further away. It is about 3,000,000,000 miles away in this photo and the light from the sun that's reached it is having to come all that way back in to us. It's amazing we can see it at all, because that light is the 'lucky' portion that has reflected almost straight off the rocks or ice on its surface. But nevertheless, it is clearly visible when you capture 30 seconds worth of those photons by bouncing them yet again off a 20 inch highly silvered mirror in a hole in a dome in a field in Norfolk. Pluto's moon, Charon, would also be visible if it didn't lie within the small circle of fuzz around the image of Pluto.

Hydrogen Balmer α

Apologies for not blogging for so long. I blame the summer twilight, and my new project. Since I got a reasonable picture of M83 (not the best of pictures - see below) I realised I could produce my own Messier mosaic. Unfortunatetly, this will take me the best part of a year, because I started in May. However, I am nearly there with the images - I have well over 90 of the 110 now and it's looking good. So I thought I would see what pictures I have that I am more pleased with. One of those I took last year with a single hand-guided exposure of about 6 minutes through a 400mm f/6.3 lens onto Kodak Elite Chrome 200 film. This was scanned directly from the slide film by Mike B, a much, much better quality scan than the crude messy job I paid the commercial photo processors to do. The field encompasses the star Sadr in Cygnus, M29, plenty of nebulosity and clearly shows the Crescent nebula - you can use it as a chart how to look for it. So here I've attached a higher quality *.bmp file for your perusal. As you can see from my previous images the Canon EOS's filtered sensor isn't a match for even ISO 200 film at the wavelength of Hydrogen Balmer α emission, 656 nm. Seriously want a modified one, but serious lack of £££!

An example of what a good 'flat' can do

I've decided to do my own collection of Messier object photos. Here is a photo of an object that I can barely see from my home latitude of 52.6ºN - M83, the Southern Pinwheel. It's 8.3 magnitude, but Declination 30ºS. Easily visible from latitudes such as Paris, Rome, New York, but venture back northward to the UK and it disappears into the murky brown skies we have here. It barely rises above the south horizon. When I took this photo it was about 6º up. (I also managed to get Ptolemy's cluster, M7 this night too!). Fortunately the observatory dome has a beautiful flat horizon, only spoilt by distant light pollution, which was exacerbated by moisture in the atmosphere after a hot, sunny day. During the long summer evening twilight, I managed to capture 10 flat field frames in a blank spot near Capella (at ~40% pixel saturation level) and thereafter I took 10 dark flat frames. So armed with a smooth flat I took 3x10", then a 20", followed by 16x30" exposures of M83, which individually looked like a yellowish blurry star on an intensely reddish brown background. I later got 4x30" dark frames. I spent the whole of the next day trying to stack them, but had to shrink each image by 50% so Deep Sky Stacker would pick up the stars, but once I did that, at 1 o'clock the following morning, the spiral arms finally revealed themselves! It definately needed the 16-bit image processing in DSS. After a quick cross-check using Starry Night Pro, I'd picked up PGC 48132, a 16.0 mag galaxy, which is just to the left, inside from 2 x 12 mag stars. What an achievement!

Lunar halo

While on my ante-meridional astronomical expedition I had the fortune to watch the gibbous moon setting behind cirrus cloud, creating a delicious opportunity for a lovely composition of a lunar 22º halo with stars above it and a very early, subtle dawn glow. Can you spot any constellations? Details: ISO 1600, 20s, 28mm f/2.8 + fish eye, rotated, cropped & colour balanced.

Good old summer sky coming back around

I recently did a midnight-'til-dawn astrononomy expedition to my solitary coastal heathland spot and saw all of those lovely summer delights at the milky way centre slowly rising in the south-east. So, I thought I would put a bit of effort into manual off-axis guiding. This involves me bent over looking at an extremely faint guide star and trying to keep it on the red crosshairs using a N/S/E/W hand pad. After the 30 second pictures started trailing because the automatic tracking was slowing, I got a 3 min 45 second picture of the Eagle Nebula, M16. I also took some 30 second darks, flats, flat darks, a 4 min dark, which roughly offset the internal camera 'glow' from the Eagle Nebula picture. After applying all the flat corrections I found my image much noisier than the raw image minus the dark. So here it is: a single exposure at f/6.3 f=1260mm 1600ISO (my manual guiding skills are great). I have used the vignetting (central brightness) to my advantage during the processing. The 'Pillars of Creation' are in the middle of the red nebula just to the right of the open cluster. An improvement on last year's multiple 30" exposures, and a surprising amount of red!

A Whale?

At last I've processed my folder full of pictures I called 'galaxy madness'. There's a whole lot of galaxies you can see and a whole lot more you can photograph with a 20" telescope on a good night in spring. Here's a funny one I found in the funny sounding constellation Canes Venatici. I detrailed and stacked 22 x 30second images of it (f/4.8, f.l=2400mm) so the exposure was 11 minutes on my Canon EOS 350D. It's an amazing likeness, n'est-ce pas?

20" vs 8"

This is the same subject as in the last photo, the Owl nebula, M97, in Ursa Major. I popped over to the observatory and took about 80 x 15s shots of the nebula through the 20" newtonian, which I could barely see through the camera after focusing on Merak. The telescope was descending from the zenith to the west. Most of the images were trailed because of poor consistency of the motor tracking and a good few were slightly spoiled because of car headlights on main beam shining right into the dome. Who's fault is this? The ridiculous number of cars on a tiny road at midnight or the observatory siting? We could do with a big sign to block the lights out. The bright moon made the background light subtraction most difficult, as it gave a subtle gradient across the picture that when processed becomes more severe. I whacked all 80 RAW picture files into Deep Sky Stacker and after about half an hour while I watched the Sky at Night, it had stacked them into one image with 8 minutes' worth of exposure (32 pics). Just look at the difference from my windswept 8" f/6.3 Schmidt-Cassegrain image on the post below. I couldn't track for as long, but the f/4.8 (fast) optics, good focus and massive aperture really helped bring out the triangle of 15th mag (ish) stars in the nebula. You can even see a couple of galaxies if you look carefully to the left and upper left of the nebula and the reddish outer edge of the nebula is just perceptible. (image repeated for comparison with below)

The Green Owl

We had a pretty display of stars from the city the other day; a clear, transparent night seemed to be underway so I got my 8" SCT out and drove up to the middle of a dark heath with a view over the sea. Fantastic! The light from the north came more from the milky way looming in the background, stationary above the sea. There was an aurora-esque shaft of light shooting out at right angles across the constellation Cepheus. A few dark clouds were actually sillhouetted against the milky way background. Ursa Major was approaching over head and I pointed the scope to it, attached my camera, focused, but the strong, cold wind was blowing the stars into little fuzzy flower shapes. I removed the dew shield, knowing that the wind would look after any condensation and set to work with a few 1 minute long snaps of the Owl Nebula, M97. Half way thorough, I ended up changing the 9V battery for my motor, and trying to repair a broken wire that has broken under field conditions like that was not nice. I spent ages trying to get Deep Sky Stacker to recognise my fuzzy stars but it was useless - I forced it to stack 16 in the end (which I had individually modified) and then it gave me stupidly blue pictures. I spent an equal age trying to work with Registax and I processed in Paint Shop Pro. The pic here is the 16 x 1 min Deep Sky Stack, ISO 1600. Apologies for the slightly yellow stars. You can see the Owl's eyes and central star. The Owl nebula, M97 is a 3' wide, 12th magnitude planetary nebula near the tip of The Plough.

Venus sweeps inside Earth's orbit

On approach to 'inferior conjunction' Venus is now a large, thin crescent, oriented horizontally - a rather strange angle for such northern latitudes and disappearing rapidly into the twilight. I dashed out to a local field with my brother and got about 40 very rapid snaps straight down my 8" SCT using a 2x barlow lens (f.l. ~ 3.9m). It's amazing how bright it still was considering how thin the crescent phase was, which by the way was easily seen in 10x binoculars and not quite by eye. I could see a fine backlit lower edge to the globe at 200x, seething in the low atmospheric turbulence and its brilliant white colour was dispersed into a near perfect spectrum. I stacked the best 17 of the 1/500" pictures (ISO 1600) and got a beautifully smooth rainbow crescent. Whilst this looked wonderful I had to use the RGB realign tool in Registax to shift the blue down and red up by 8 pixels to get a much sharper white crescent. Here's the final imaged cropped to a 500x500 bitmap.

Lulin encounters the Eskimo

Popped down to the observatory tonight as the weather was virtually promised to be clear. I had to walk past a load of kids getting up to dodgy things in the village hall car park as they had parked in the way of the gate to the observatory field. I don't mind 'club' music but there was some boring but extremely loud, monotonous, repetitive rave music coming from the hall where they were all gathered outside, smoking. Still, they were no bother, the moon was out of the sky, the floodlights weren't on - the only problem was the large amount of passing cloud the weathermen hadn't predicted again - the liars! (about 5 'octas' worth, I believe). I could see the constellation Gemini, which is where the comet Lulin was currently sailing as it was quite near overhead. The scope worked fine, I got lucky with several clear patches and captured 6x30second pics of the comet, but then I realised the comet was very near the Eskimo or Clown nebula. I squeezed both into one camera field at a push and got 3 shots - and thought this was much more worthy of a blog entry. The nebula is slightly overexposed, but it was a balancing act to process. I've included the Lulin shot also, processed to see the tail. I put the telescope to sleep (as we say) and got straight out and straight home in good time for bed for once (not that I have gone to bed, I am an astronomer after all).

The butterfly nebula in the constellation of the unicorn

I pushed the processing of this little planetary nebula (NGC 2346) until I could just see the wing shapes around it, that give it the name of the butterfly nebula. It was not obvious to see visually, although there was definately a bluish haze around the central star. This star is a spectroscopic binary, and is variable - possibly due to dust orbiting around the pair every 16 days. The dust could also explain the infra-red emission. I thought I'd give you a wide field shot; 20' x 30' is the raw field from the 20" scope and I took 8 x 15 second pictures at ISO 1600 on the Canon EOS 350D.

A couple of nice spiral galaxies

If you can recognise these, you have passed the test as a good experienced amateur astronomer. As a further clue, I also got a decent picture of a galaxy nearby, just one field width off to the North. I believe 6 x 30 second pictures on the 20" telescope is all it took to get the raw pictures, but the processing was what removed the light pollution and brought all the detail out, especially on the left galaxy.

The Night-Knight

Yes it's a rubbish pun but this looks exactly like the chesspiece. I took a plethora of exposures of assorted lengths through John G.'s filter and detrailed them all eventually. I have found an alternative way of doing this in Paint Shop Pro 7 using layers and 'darken' like the Photoshop method. The result looks quite good small. Pretty smooth. I played around with the pixel value mapping curves to process the stacked image. The vast red cloud IC 434 shines in hydrogen light so it's called an H II ('H-two') region. This light, unfortunately for our visual range of colour, is mostly 656.28 nanometres (H α) in the red, but a very tiny proportion is H β at 486.13 nm, which is in the blue region, enabling us to see it, barely! It's still too faint for my liking - the best I saw was a smudgy line with a gap in it where the horse's head is. This gap is a dark nebula, a dense protrusion called Barnard 33 (B 33) or The Horsehead Nebula that is part of an awesomely sized dust cloud floating in front of one side of IC 434. The blue cloud is a reflection nebula (NGC 2023).

Leo I

With this title I am not referring to the papacy, but the local dwarf galaxy near the star Regulus, which I was thrilled to pick up on this photo. Not a fantastically sharp picture, like some of those all-nighters on the internet, but artistically composed let's say. Those dedicated astrophotographers are blessed with fantastically dark non-misty skies and $1000s worth of equipment, whereas I have UK weather, UK light pollution, a hand made scope, a reconditioned D-SLR and little patience. There is also a 14th magnitude galaxy at the bottom - North is right on this pic. It was 6 x 30 second RAW images converted to TIFs, detrailed and then stacked in DSS (apologies for all the TLAs).

A stellar tantrum

One of our Society (John G - please visit his blog: see link) bought a 2" UHC filter that he lent me, so being knowledgeable of the sky, and it being winter, I decided to try it out on a rather strange patch of nebulosity near Sirius called 'Thor's Helmet'. After screwing the filter in place on my Camera adaptor and refocusing, I did a range of exposures from 30 seconds to 3 minutes, all of the longer ones trailing, and some of the 30 second ones trailing also. I detrailed all the trailed ones using the filter manually in Paint Shop Pro 7 just as jpegs, and ran them through Deep Sky Stacker. I was struck with the beauty of the resulting picture that appeared in front of me. And when I processed them in PSP7 I was stunned with the result. DSS selected 18 exposures, most 30 seconds, 3 of about 70" and 2 about 3', but equivalent to ~30" because of the detrailing process, of which it took an adaptive weighted average. Thor's Helmet, NGC 2359, is 7º from Sirius and exists because of a frantic massive star, called a Wolf-Rayet star near its centre. There is Oxygen O III (or O2+) emission in the centre and Hydrogen clouds further out.

Phoebe

I did hours of detective work recently, trying to find which little smudge on my processed images corresponded to Saturn's outer moon Phoebe. Both my sky chart programs were completely wrong with its position and I had to follow-up with some more images 3 days later. It's a rather lovely name for a very porous, dim, reddish rock that orbits in a 550 day retrograde orbit. She spins in 9 hours, so is not tidally locked like the other moons (and our own), leading astronomers to think it could be a captured asteroid. I'm amazed it was detected in 1898; it's only 16.45 magnitude! Take a look at the hi-res Cassini pictures to see how unbelievably full of holes it is. It was a case of taking 4 x 15 second exposures for each area around Saturn and stacking them to reduce noise. Here is the labelled version of the Tuesday night (Weds morning) when more moons were visible. The planet is rather overexposed (if you were wondering where the rings are).

Sol

I looked out of my window this morning and saw unexpected whiteness everywhere. There was no snow forecast, it was just a deep, powdery frost. So I went to my local heath to take some photos and as I climbed the hill I turned back and it was one of those rare occasions when you can look straight at the sun. It was wierd, like looking at a blank, white moon and I gave it a good stare, but I couldn't see any sunspots. I bracketed the exposures but chose the 1/2500" on ISO 100 with the Canon standard lens zoomed in to 70mm. This picture is a crop of a high quality jpeg and the optical quality is amazing, so I couldn't bear to scale the picture down (as I do for all the space pictures that overexpose stars into huge blobs). It was -4º with a breeze and I had no gloves, so in no time I had immobile hands and the autofocus frosted over.

My attempt at stitching photos together.

This is a worthy subject for a panorama: M33 the close spiral galaxy. It has lots of nebulae and clumps of stars visible - click on it and scrutinise the outer regions. I did 4 x 4 x 15 second pictures on the 20" scope with the centre of the galaxy in each corner and tried to stitch them together using the camera's software. The brightnesses were all different - I spent ages trying to adjust the brightness of different parts of the final picture but I had to stop sometime. I don't know of any free software that can easily correct for these subtle brightness differences. Anyway, my previous M33 pic (below) made it into print in my society's newsletter... but I've done as I said in the accompanying post and taken an improved picture (without any of those trailed smudges or the heavy blue bias).

Interacting galaxies

Blogger just lost my post because my finger accidentally fell on to the laptop touch-pad and clicked back on the browser! When I went forward again it was blank and so was the saved draft! Has anything similar happened to you? Anyway, enough ranting, here I present NGC 672 and IC 1727, and even a red galaxy PGC 1803573, which Andrew found out for me - the guy who does the 'littlebeck' blog. Can you see that the galaxy on the right, IC 1727 is a distorted former barred-spiral?

Cosmic Keyhole

This nebula is pretty easy to find - it is just below the Orion Nebula. NGC 1999, or the Keyhole nebula, for obvious reasons. It is quite striking in appearance due to the cloud of cold, dark 'dust' blocking the lit clouds behind. It is a reflection nebula, so I tried to process it to bring out all the faint outer nebulosity. Visually, it didn't look like much: just a smudge around a faint star, even in the 20" scope.

NGC 1535

I made the most out of the clear sky on Boxing Day, so here is another planetary nebula, in the constellation of Eridanus, NGC 1535. It looks a bit like a small version of the eskimo nebula and no doubt some budding astronomer has tried to name it, but I know it as NGC 1535 now, even though it's just a bunch of letters and numbers. It's got a second star in it, although I'm not sure whether this is a line-of-sight effect or not; surely in a close pair of stars one star can run out of fuel first and release it's atmosphere into space.

Tiny planetary nebula

This picture is of a tiny planetary nebula in the constellation of Lepus, called IC418. From the Hubble picture, it was christened the Spirograph nebula. This picture might not be particularly good but when I looked at it with a high magnification, it looked like a star surrounded by tiny pink rose petals. For some reason the central star is trailed, but the exposure was only 1 second taken remotely at the ISO800 setting on the camera. Unless there was camera shake, I have to presume the central portion of the nebula is elongated. I had to double the width and height of each pixel for this image. There appears to be a bit of structure in the pink disk.

Jones 1

...or to give it it's proper title, PK 104-29.1 . This planetary nebula was not picked up during the first great sky survey of about 10,000 deep sky objects for the New General Catalogue and the Index Catalogues. It is about 12.7 visual /15.1 photographic magnitude and its blue glow is spread over the two main arcs of a twisted ring over 5' in diameter. I saw the glow from one arc in the 20", but using a Lumicon UHC filter I could see both arcs and make out the ring - it was faint but easy after 10 minutes dark adaption - both of us present saw it visually this way. The central star is very blue and magnitude 15.7 easily captured in this image comprising of 9 x 30 second exposures (without detrailing). It is easily located (but not seen!) by going 1ºSSE of 72 Peg which is just north of the Square of Pegasus.

How many galaxies can you spot?

Sitting in the control room below the main dome, I was browsing the deep sky software and decided to slew the 20" toward the hitherto unknown (cliché) Pisces Cloud. I went upstairs and visually located NGC 403 and hopped over to the galaxies, which I could see as a few fuzzy patches strung out more or less in a straight line. I stuck the camera on and collected lots of trailed 30 second exposures. This is the current problem with the scope - not that it doesn't know where it is, but something somewhere is causing a quasi-periodic error. I later detrailed these and got 14 reasonable shots that I stacked and aggresively processed. You can see the purple amplifier glow at the bottom right and some headlight/light pollution residual artefact across the picture (taking flat-field images addresses this issue but make the problem worse before they make it better in these circumstances). I think it looks cosmic.

Venus, Jupiter and a Plane

Here's one of the scenic examples of my shots. It is of the observatory building showing the dome glinting in the moonlight and also features a plane flying in the distance behind it and the planets Venus and Jupiter. This wide-field photograph of 15 seconds at f/5.6 was taken on December 6th shortly after sunset at 1730 UT and has also captured some annoying but in this case quite aesthetically pleasing light pollution.

Looking back to the summer sky in an icy winter wind

This picture of M57 was taken from the observatory dome with an icy wind blowing in the opening, soon after dusk twlilight with Lyra and Cygnus still reasonably high in the western sky. The only problems being 1. car headlights and 2. a buffeted telescope. I couldn't get any 30-second shots without trails, so I de-trailed them all (phew!) and stacked the best 16 of them. Despite the de-trailing artefacts which appear as streaky noise you can easily make out IC 1296 the 15.1 magnitude spiral galaxy to the right.

Using my f/10 SCT at f/4

As I do astronomy on a budget, I like to see what I can fudge together or get away with. I do not have sophisticated tracking equipment on my SCT, just the R.A. motor and a manual guiding 1 x sidereal rate hand controller. This would suffice if I were to enjoy spending hours typically at -2ºC, hunched over an eyepiece, trying to counter the effects of wind and drift in my motor versus the sidereal rotation of the earth. I can't be doing with this and my knowledge of optics tells me that at f/4 compared with f/10 optics, the light gathered per area is 2.5x2.5=6.25 times greater thus shortening exposure times. I got hold of a second f/6.3 field flattener and after many long attempts with various coupling adapters I found a combination that worked with the focus at the end of its travel. I had to use a 1 1/4" adapter (I will get hold of a 2" version ASAP) so the vignetting (edge-of-field clipping) is quite severe; still it gives it a lovely 'through the telescope' quality! This is the Pleiades with an effective focal length of 800mm and aperture of 200mm in a single shot of about a minute.

A fire in space

I am very pleased with this picture of the Flame Nebula. Enjoy.
Mae'n dda gen i gyda hyn Lluniau y Niwl Ffagl. Mwynhau.
Ich bin mit dieser Abbildung des Flamme-Nebelflecks sehr erfreut. Genießen Sie.
Είμαι πολύ ευτυχής με αυτήν την εικόνα του νεφελώματος φλογών. Απολαύστε.
Je suis très heureux avec cette image de la nébuleuse de flamme. Appréciez.

M1

This is clearly not a photograph of the motorway that runs between London and Leeds. It is of the remnant from the supernova seen by the Chinese in 1054 as a star so bright it could easily be seen broad daylight. I want to see another. The very old star Betelgeuse in Orion is due to go supernova sometime in the next few tens of thousands of years and hopefully it will do it soon, during wintertime. That would be a truly awesome sight. A pinpoint of light much brighter than the full moon, turning the sky blue and casting sharp shadows when it rises at night. There is a slight risk of effects from the radiation, but we're just at a safe distance (no one knows exactly what this is, but it's about 600 light years away). Anyway this picture of M1 took 30 seconds on the 20" scope. This object is otherwise known as the Crab Nebula and it lives in Taurus, very close to the star ζ (zeta) Tauri.

Orion is back. Hail winter!

I had to test out the camera on the Great Orion Nebula. I knew it was very easy to saturate the centre of the nebula, so I took pictures of 30s, 6s and 1s. The individual frames looked lovely. I stacked the 3 pics in Registax after subtracting the light pollution and adjusting the brightness, contrast, gamma. The result is just an addition of the 3 different exposures, which isn't technically an accurate way of displaying it, but is necessary because of the large range of brightness.

A Hallowe'en night moon.

The observatory scope has just been recollimated, which enabled me to visually spot Titania, a magnitude 14½ moon, 20 arc-seconds below the 6th magnitude planet Uranus, which appeared at 200x as a very clear bright green disk, wobbling around in the atmosphere. I thought I'd have another go at some pictures of the moons, and there were some surprising background stars right behind the planet. I saw 2 moons, stacked 6 5 second pictures and revealed a 3rd. So here are Titania, Umbriel and Oberon. We quite like the effect of the starburst cross on the planet, which is 3000 times brighter than the moons. Incidentally, we had a little bother identifying the moons using astronomy software, as it didn't allow for the almost 3 hour light time and they move significantly in this time!