I have a question about converting times from JD or HJD to BJD-TDB. There is a web-based utility offered by Ohio State to convert to BJD-TDB Time Utilities
To do the conversion, I need to know the location of the observatory (Lat., Long., & Elev.). We don’t know those values for observations posted in the AAVSO database. This is important when combining measurements from different sources that are taken over a period of time. Anyone have any suggestions?
Use the default observatory location (the geocenter) as in the attached partial screenshot of the utility web page for converting UTC to BJD_TDB. (Edit) The RA and DEC of the target must of course be entered.
I believe the error introduced by using the geocentre instead of the actual observatory coordinates may be no more than about 20 milliseconds.
