I moved to use the program FotoDif, to make my measurements.
This is orginal Fotofif data:
ABSOLUTE PHOTOMETRY
CALIBRATION STARS:
C1: 13.068
C2: 13.37
UX UMA CHK-135
GEO J DATE MAG +/- NSR MAG +/- NSR AIRMS TRANS FWHM" BAKGR N NUM
----------------------------------------- -------------------------- ----- ----- ----- ------ -- ----
2456725.21170 12.909 0.009 121 13.509 0.012 92 2.399 1.06 3.83 16.79 01 0001
2456725.21219 12.900 0.009 122 13.520 0.012 92 2.398 1.07 3.98 16.87 01 0002
When make AAVSO report, FotoDif compute time only as Heliocentric Julian Date - HJD. Is that ok?
Below an example AAVSO report generated by the Fotodif - is it right?
Chart is 13186DYN, Filter Jhonson-V, two ref.stars (131 and 134) Chk star is 135.
#TYPE=Extended
#OBSCODE=KTU
#SOFTWARE=FotoDif 3.89
#DELIM=comma
#DATE=HJD
#OBSTYPE=CCD
#NAME,DATE,MAG,MERR,FILT,TRANS,MTYPE,CNAME,CMAG,KNAME,KMAG,AMASS,GROUP,CHART,NOTES
UX UMA,2456725.21496,12.909,0.009,V,NO,STD,ENSEMBLE,na,135,13.509,2.399,NA,13186DYN,na
UX UMA,2456725.21545,12.900,0.009,V,NO,STD,ENSEMBLE,na,135,13.520,2.398,NA,13186DYN,na
DATE:
Reply to myself:
http://www.aavso.org/aavso-extended-file-format
Hi Timo,
As you already found out, the AAVSO Extended Format supports HJD. I personally submit all of my data using that date format. WebObs stores the HJD and then converts it to JD and also stores that value with each record (since the Light Curve Generator currently uses JD for its plots). When someone downloads your observations, they will see the original HJD that you used for the submission.
Arne
Arne
Are you aware of any programs, hopefully Win, that will pick up the RA, Dec and JD from the image Fits header and output the HJD?
Thanks
Donn
AIP4WIN will output HJD. You just have to have told it lat and long in the settings.
Terry
Hi Donn,
I'm not a Windows person, so I hope someone steps forward with an answer for you! There are several HJD calculators on the Web (and of course, IRAF has such utilities...), such as
http://www.physics.sfasu.edu/astro/javascript/hjd.html
Arne