[Aavso-photometry] HJDo?

[Shawn Dvorak]

Michael Koppelman wrote:
> HJD_0 is, for binaries, the middle of the primary eclipse. For RR's  
> it's the maximum. So that can vary. If you have the emphemeris you can  
> calculate the min (or max) by:
>
> HJD_Min = HJD_0 + P*k
>
> where k is some integer number. Play with k until you get a time  
> within the day you are looking for.
>
> M.
>
>
> On May 3, 2008, at 10:43 AM, Steven Orlando wrote:
>
>   
>> For a variable star, if you have an HJDo and a period(d), how is  
>> HJDo defined, and how can you calculate an ephemeris for a star with  
>> an HJDo and a period?
>>     
>
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>   
If the star(s) of interest are included in the database I use, you can 
have the calculations done for you for your location at 
http://www.rollinghillsobs.org/perl/calcEBephem.pl.

Shawn Dvorak