Affiliation
American Association of Variable Star Observers (AAVSO)
Sat, 10/24/2015 - 22:40
I observed NSV 1436 last night and it seemed brighter than the nearby comp star 129 with CCD exposure of 180 seconds with a photometric V filter. I subsequently did a 1 hour time series with BVI filters and wil submit this date to AASVO.
FJQ
Here is my transformed BVI data for NSV 1436, for 22-25Oct15 (there was no data for 23Oct15) taken through a CDK17 telescope and ST-10XME with Astrodon BVI filters; Note that 25Oct15's data was taken through clouds. Most of this data comes from a time series during outburst on 24Oct15:
http://www.astroimage.info/images/NSV1436BVI%2822-25Oct15%29.jpg
James
James
180 sec seems to be a very long exposure time to me, I do nothing that long at all and get good results. Are you sure you are not saturating the pixels?
John R
RIZ
I usually do 180 secs 2x2 bin on these kind of objects in quiescent phase. As you see in my data for 24Oct15 and afterwards, I switched to 15 sec exposing when in outburst. I only did this when I noticed the incoming 180sec frame showed it in outburst. On some variables, I shoot both a short and long exposure to get good signal whatever the variable state is. On systems like NSV 1436, I usually don't since they have an indefinate period. It's very easy to pick the wrong star in the quiescent state, since NSV 1436 has a bright companion south of it. When in outburst, the companion ' s light is superimposed on NSV 1436.
James
p.s. Here is a little AVI i did of NSV1436 before and after outburst: http://www.astroimage.info/images/NSV1436BVI-22-25Oct15.avi