Well done. At least you got an image.I went out a 9pm last night and there were lots of stars to the south. As I walked outside I felt rain. Clear to the south and rain overhead. Very annoying.
Took these live/ semi live views last night The first pic is a live view, using a Mallincam video camera, the rest have intergration times.
SCT 11in with a MFR5 focal reducer
Tonight (4 November, 2012), the SN is VISIBLY much brighter in magnitude than previously, and noticeably brighter than the star near it (close to the spiral arm).
Photos later... trying to get some in between clouds.
I could visually see the S shape structure of this Galaxy and the Super Nova.
Time available to me was very short this week so this is a quick one to see what it was like, hoping to get more time to image this weekend at a darker site.
40 x 25 sec subs
Stacked in DDS no darks or flats just tone curve adjustments crop and resize
12” LX200 (alt/az setup) Sony Nex-3 camera
Hi Ivan, yes of course, but i will have to wait until i get home from work, or maybe at lunchtime. I processed it quickly this morning so I could post it here, but didnt really have enough time to measure the brightness properly.
Hi Ivan, yes of course, but i will have to wait until i get home from work, or maybe at lunchtime. I processed it quickly this morning so I could post it here, but didnt really have enough time to measure the brightness properly.
Guys,
Magnitude estimate from a 5 minute subframe that was used in my 17 minute image last night, 5/11/12.
Using SkyX and CCDSoft, checked with MaximDL, I get 13.1 to 13.4 using UCAC3 reference stars.
Guys,
Magnitude estimate from a 5 minute subframe that was used in my 17 minute image last night, 5/11/12.
Using SkyX and CCDSoft, checked with MaximDL, I get 13.1 to 13.4 using UCAC3 reference stars.
Greg Seems a lot brighter to me
I would put it at the back end of mag 12 at least.
I could see it quite easily in my 8"SCT with a 21mm plossl.
But I bow to your greater knowledge of magnitudes from images
Cheers
Greg Seems a lot brighter to me
I would put it at the back end of mag 12 at least.
I could see it quite easily in my 8"SCT with a 21mm plossl.
But I bow to your greater knowledge of magnitudes from images
Cheers
HI Ron,
yes, i measured a range of values of field stars as well as the SN to arrive at those values above, and I recall measuring one value for the SN of 12.8 at one stage, but it was in the minority so I dropped it.
Please rest assured that I'm not expert here, but I do know there are traps and pitfalls that can make the process difficult to get the correct result. I checked and re-checked my estimate with the tools as I noted above, so i was happy that the value i derived was OK.
Now, that being said, after I posted the estimates above, i was thinking about it bit more and one of the things that can bias a magnitude estimate in a CCD image is the linearity of the pixels. I notice in my 5 minute image that the pixels of the supernova are almost at their limit, although not saturated, so I think i should go back to another image with a shorter exposure and compare the brightness results.
My estimate above was done quickly while I grabbed some lunch at work, so there's a good chance that I should have used an image with lower pixel levels so that the response is still well and truly linear.
I'll check further when i have more time and get back to this thread.
