We’ve been up on the roof many times since the last update. Usually it’s pretty frustrating, I’ve become an expert in weather websites. We still don’t know what we are doing, we don’t have a very good camera yet and we still haven’t got a digital focuser. While we can see them, we certainly can’t take photos of nebulae, galaxies or anything like that yet. We also need a reducer (de-magnifier) for that, they are generally much larger than the field of our camera and our current camera is not very sensitive.
So we are left with planets, but the planets are currently not really being helpful. Mars is only visible shortly after dusk close to the south west horizon – basically you are looking through lots of Lamborghini exhaust from Chelsea. Me and Edo tried to look at it. The air was so turbulent it was as if the planet was on fire.
Nick at the Widescreen Centre (who is the best thing about the Widescreen Centre) says we should forget looking at anything less than 25 degrees below the horizon. Jupiter is only about 30 degrees above the horizon at 1am and I can’t stay up till 4am. This will get better in the coming weeks and months but for now, there is our first attempt at imaging. I did it with Sunayana tonight. She was up for staying later and it would have got better too, as Jupiter is rising, but I wanted to get home.
We also looked at the moon and did some picture taking, I think with better seeing we will be able to improve on this a bit, but I do wonder how good the seeing ever gets in central London. Now we’ve just got a new boiler, I’m hoping for a cold snap!
UPDATE: I found out this is Gauss Crater using my wife’s Rand McNally Moon Atlas. It’s not South East it’s North East. Bit difficult to tell which way is up when it’s a full moon…
How many frames were these? There looks to be quite a bit of noise in them. Perhaps try for a bigger stack? I think they look OK for “first light” pictures though. What camera is it? Have you got the telescope itself well collimated? What focuser are you using? The built in one or have you attached a crayford on the back? The built in one on mine causes all sorts of problems – I get mirror flop every time I move it so it knocks the collimation and focus out. But they might have fixed that problem on the better models…?
Hi Chris, the telescope looks well collimated as far as I can see just from looking at the concentric rings when out of focus. This stack was about 100 I think. I think a bigger stack wouldn’t really help but I could be wrong. We have not taken delivery of the digital focuser yet, that arrives next week. We’ve never seen collimation off in terms of concentric rings going obviously non-concentric.
We are just using a skyris 618c for this one.
I think it’s difficult for you to comprehend how bad the seeing is close to the horizon. We will try a bigger stack and different exposures when Jupiter is higher.
100 frames? I run 14000 frame capture then use the best 10-20%. Come along to a BSIA meeting in Regents park.
jupiter is rotating, how to you manage to avoid that screwing up your 14000 images?
The imager has a max fps of around 200. WinJUPOS can be use for derotation.