Thu, 09/05/2024 - 01:23
Just starting to test if I can see exoplanet transit . Not sure of exact time of events shown in table from Astro.swathmore.
If I ask for local time is this for the long./lat of my site ? I tried to check using the BJD/TBD column but I can’t find any reference to convert this to time . Reason I’m asking this is because I took 4 hrs of data for the 9/1/2024 transit of HD189733b and the target and comp. Stars I used showed the same behavior. Did I miss the date ?
I’ve been checking work using variable stars and have guided sufficiently to see changes of 0.01 mag .
Any help would be appreciated .
Rich Tansey
Reno,Nevada
Rich:
Assuming you entered your own lat/long into the swarthmore site, the local time is for your own location and time zone. Check out UT and you should get the expected time zone shift. BJD is a modified (Barycentric) Julian Date so search the web for a calculator from JD to time (Day, HH MM SS).
BTW, what software did you use for time series photometric analysis of your images? What was the expected transit depth of your target? Your precision may not be quite up to exhibiting the small transit depth? AIJ would be a good choice for transit modeling among the typical noise.
Ken