Hi, I hope someone please can help me.
The other night, for the 12492394234 time, I tried to detect the transit of hd 189733 b, the easiest transit.
I used a pentacon 200 mm f2.8 of 50mm of aperture, cmos camera zwo asi 120 MM of 12 bits, a skywatcher eq3-2 mount and later the astroimageJ program to process the data.
i started recording at 1.20 (10 min before the beginning of the transit) and stopped at 3.40 (20 min after the end), because where I live is UTC+2, according to the ETD:
i took 147 photos, 1 per minute, each of them lasting 10 seconds
I used a gain (iso equivalent) of 17:
the ingress is 0.48550 and the egress is 0.56065 according to the NASA explanet archivee:
The apertures I choose are 5, 15 and 25
No matter what or how many reference stars I choose, this is the plot I get, which doesn't make any sense to me:
https://ibb.co/c3hnhe here you can download my data:
when i turn on the fit mode, i get something like a light curve, but i believe the light curve should have already appeared without the fit mode:
I would appreciate if someone could please try with his laptop/program and tell me if he gets the same or different results
What am I doing wrong?
In another forum they said it might be because the photos are oversaturated, but they didn't look oversaturated when i was taking them, and I don't know how could they be oversaturated with 10 sec of exposure
Also some said that it may be because i may have been taking 8-bit photos, which I don't understand since the camera I use has a resolution of 12 bits; the program that came with the camera is SharpCap