Wikipedia:Featured picture candidates/Comet C/2013 US10 Catalina

Comet C/2013 US10 Catalina
Voting period ends on 30 Jan 2016  at 11:06:21 (UTC)
 * Reason:very good quality picture with EV
 * Articles in which this image appears:C/2013 US10
 * FP category for this image:Featured pictures/Space/Looking out
 * Creator:Alexander Vasenin


 * Support as nominator Not as impressive as NASA images, but a very good work for an amateur astronomer. It also could be useful to illustrate other articles. – Yann (talk) 11:06, 20 January 2016 (UTC)
 * comment there are a number of lines of red pixels (most obvious is at 4 o'clock to the nucleus. Anyone know the cause?©Geni (talk) 11:28, 21 January 2016 (UTC)
 * File description says: stack of 5 exposures over 5 minutes. I think those are bad sensor pixels. The 5 images were aligned later in software because the stars move over 5 minutes. So the bad pixels streak like that. Bammesk (talk) 03:27, 22 January 2016 (UTC)
 * (Author) Yes, those are hot pixels. I used dark frames (as well as bias and flat frames) to calibrate every light frame before stacking them. Unfortunately sometimes it's not enough. I'll fix those and post updated image. BTW, it's 5 frames with 5 minutes exposure for each frame (I've fixed the description). It's quite difficult multistep process to stack a comet image, because a comet moves very significantly relative to background stars over half an hour. --Alexander Vasenin (talk) 04:17, 22 January 2016 (UTC)

--Armbrust The Homunculus 11:41, 30 January 2016 (UTC)