Thursday 24th January 2008

A clear night woohooo, I don’t see too many on them!

I left work early thinking I’d make a start straight away, but found my wireless LAN wasn’t working. After an hour or more of un-installing and re-installing drivers, trying different adapters and eventually testing the LAN with a Nintendo WII(!) I discovered my new TV sender was interfering with the LAN signal. A quick change of channel on the sender and everything was working, but I’d lost precious time.

A hasty setup and polar align then straight into imaging. There was a breeze which from timw to time was an issue and later on some clouds, but apart from that it was good viewing weather. I don’t know what possessed me but I started looking around for faint galaxies and nebulae, but without a guidescope my long exposures are still limited to 10’s of seconds.

I’ve done some very rough processing so far but I’m sure there will be many rainy nights when I can revisit them.

Here are a few:

The Bubble Nebula

 

bubble_nebula2.jpg

NGC 7333 Galaxy Cluster

NGC 7333 Galaxy Cluster
NGC 6946

NGC 6946
I’ll get some more details on here when I get a minute.

All images taken with Atik 16ic Mono, 254mm Newtonian with 1200mm focal length on EQ6 Pro Mount.

I was contacted by Belfast University regarding my images but asked to keep it quiet as they’d discovered a Supernova (SN2008S) in NGC6946 and wanted to use my images to confirm it’s existence and estimate when it first occurred.  As a “thank you” they included my name in the list of authors – does that make me a scientist :)

Here’s an extract from the resulting paper:

We commenced monitoring SN 2008S shortly after the discovery
epoch and collected data for the following eight months with a sam-
pling rate among the highest ever obtained for such a peculiar tran-
sient. Data obtained before the discovery date by several amateur
astronomers are also included to constrain the explosion epoch of
SN 2008S. The unfiltered image acquired by D. Abraham on Jan-
uary 16 (JD 2 454 482) shows no object visible in the SN 2008S
location with a limiting magnitude of 19.20 in V band (18.60 in
R band), while the first detection of SN 2008S is eight days later
on January 24 (JD 2 454 490). We therefore adopt January 20 (JD
2 454 486) as the explosion epoch, the uncertainty being about 4 d.
The phases in this paper are relative to the explosion date (when we
fix ph=0).

The full paper is available here http://arxiv.org/abs/0903.1286

Wednesday 16th January 2008

Finally I find myself between two weather fronts, after more than 2 weeks of non-stop rain I’ve had a couple of hours of almost clear sky this evening.  High cloud and a steamed up CCD cover made faint fuzzies too difficult although I did manage a few frames early on. As the clouds gathered I packed away the Atik 16ic and fetched my new un-modded SPC900NC. With the addition of a 3x barlow I turned the scope to Mars.

So here are 2 firsts for me, NGC6946 which is a magnitude 10.5 galaxy in Cepheus taken with the Atic 16ic. It’s a stack of 8×20 second frames stacked and stretched in K3CCDTools. The clouds may have parted but between the breeze and my not so good tracking most frames were unusable.

 NGC6496

My next “first” is the red planet. Previously I’ve viewed Mars through an eyepiece with a 2x barlow and barely been able to make out any surface detail, but tonight after a quick laser/barlow collimation and some lucky focusing I’ve managed a half decent image (IMHO).

Mars x2 Mars original size

Scope: 254mm Newtonian
F/L: 3600mm
Camera:     Unmodified SPC900NC

Wednesday 2nd January 2008

Finally I got out with the new camera last night, it wasn’t the clearest of nights and by 1am there was complete cloud cover, but I managed a couple of hundred frames (FITS) which I now have to process.

The reason I have FITS and not an AVI is that K3CCDTools failed to work. I’d configured the software a few days ago and run some darkframe tests just to make sure everything was ok, but on the night it let me down. The menu let me select Atik and the camera was on the list but when I selected it the Atik control panel failed to open and the control panel icon was greyed out. I’ll have to look into this but it gave me a chance to look at ArtemisCapture which comes with the camera.

The first thing I noticed was that focusing took longer than usual, this was mainly because I’d left “auto-stretch” on which meant the image was very dark. Later I found the focus tool but I think I did an “OK” job without it.
M52 - Click for a bigger version

So here it is, the image that I’ve waited a month to see, first-light with the Atik 16ic. I was aiming North West after aligning on Deneb and after slewing star to star northwards I came across M52. The image is a stack of 9 from 12x10second exposures, stacked in DeepSkyStacker and processed in PhotoShop.

Field of View

I have an image of M52 taken with the SPC900NC for comparison but after putting the images together they are different orientations so while it’s difficult to demonstrate here it does give me a chance to show the difference in fields of view between the two cameras.

After taking 12 frames of M52 I moved around the sky for the next 5 hours, taking a few frames here and there just to see what I could see. What I hadn’t seen was the cloud coming over and it wasn’t until I went out to put the scope away that I realized there wasn’t a star to be seen with the unaided eye.

NGC457 - The Owl Cluster
I couldn’t resist taking a few frames of the owl cluster (NGC457) in Cassiopeiae which I’ve also taken with the 1004x and SPC900, but I think this is my best yet.

M1Here’s another from the same session, my best M1 so far. When you consider this was late in the session and almost certainly taken  through cloud it’s not that bad. Well at least it’s recognisable.

Thursday 27th December 2007

I haven’t had a chance to take my new Atik16ic out for a test run yet, but I did try a dark frame and I’m a little concerned. Is it normal to see a darkframe like this?

Click on the image to see original size

This was 20 seconds with the lens cover on. I was hoping for a completely black image and was very surprised to find this light area across the image. I ran several test frames using  ArtemisCapture and this image was one of the last when the camera had been on for several minutes. The image was taken indoors, the room temperature was around 20°C any feedback would be very helpful.

Wednesday 26th December 2007

The sky has been overcast for a couple of weeks with no sign of a break in the near future – I blame all the astro kit that people had for Christmas! (and that includes me ;) )

As well as the Atik 16IC I was surprised to have another SPC900NC under the tree which is just what I need for planetary work. Since modifying my first SPC900 I’ve found it’s great for the long exposure work but a bit hit and miss in video mode. I think this is down to me not connecting the ground of the camera to the ground of the parallel port – but that’s another story.

Anyway, in order to get the camera into the 1.25″ eyepiece tube I need to fit an adapter, which I happen to have from my first camera which is now rehoused. The process is very simple and I’ve taken some photos to demonstrate how:

premod.jpgFirstly I removed the stand from the back of the camera by gently twisting it.

removecap.jpgNext you need to remove the light grey cap which surrounds the lens.

Ease a small screwdriver into the gap between the cap and the camera body and it’ll pop out.

lensin.jpg
This picture shows the grey cover removed and the black lens assembly in place. The lens is unsrewed with your fingers, no fancy tools required.

You can see a scratch where I wasn’t too careful with the screwdriver – oops.

lensout2.jpgHere the lens has been unscrewed clearly showing the IR filter which looks pink on the back of the lens.

I’ve tweaked the image to show the CCD.

adapterfitted.jpgFinally screw the 1.25″ eyepiece adapter into the camera. Don’t forget the CCD is now exposed so if you have a cap to cover the end of the adapter now would be a good time to fit it. I don’t have a cap but my balow lens does so I leave it attached to the camera when not in use.


This is not a “modded” camera in the true sense as the circuitry hasn’t been moddified but with the simple alteration the camera is now ready to point at Mars on the next clear night.