Hristo Pavlov
4-th Trans Tasman Symposium on
Occultations
5 April 2010, Canberra
 Started
as project for Astrometry
 Significant learning for me, read many
papers on the topics of Photometry and
Astrometry
 Shifted the main focus from astrometry to
asteroid occultation measurements
 First line of code written in April 2009
 In closed beta testing since January 2010
 Planned release date as public beta –
May 2010
 Improved
tracking
 Easier to reduce light curves by new
users and more control for advanced
users
 Ability to save and send a small in size
light curve file that can be used by others
to do additional reductions
 More ways to do photometry
 Ability to correct for Flats and Darks
 Image
Calibration (Darks & Flats)
 Digital Filters
 Photometry – algorithms
 Photometry – standard system as filters
 Photometry - variable star methodology
 Astrometry
 Spacecraft Star Orientation – lost in space
algorithms
 Packages for stellar photometry
 CCD and Video camera documentation




Stetson. P., 1986, "DAPHOT: A computer program for crowded-field
stellar photometry", http://adsabs.harvard.edu/cgibin/bib_query?bibcode=1987PASP...99..191S&db_key=AST
Stetson. P., 1989, "The techniques of least squares and stellar
photometry with CCDs",
http://nedwww.ipac.caltech.edu/level5/Stetson/Stetson4_2.html
Mighell, K., 1999, "Algorithms for CCD Stellar Photometry",
http://www.adass.org/adass/proceedings/adass98/reprints/migh
ellkj.pdf
Fadeyev, V., 2004, "PSF Photometry Lecture",
http://panisse.lbl.gov/snphot/lec8_vitaliy_PSF_fit.pdf
 April
– September 2009: Built a prototype to
test the photometry and astrometry
algorithms that are going to be used
 June – July 2009: Acquired and reported
astrometry of bright asteroids and comets
using the prototype to test the astrometry
precision (~ 0.3”)
 October 2009: Did tests of the photometric
algorithms with real star fields. Published
the results on my web site at:
http://www.hristopavlov.net/Articles/Video
Photometry.html
 Developed
between November 2009 –
April 2010
 Used code from the prototype
 Rewrite of the tracking to add significant
improvements
 In closed beta testing since January 2010
DEMO1 - 2000AJ55 (17h 56m 36s -26d55'42'').AVI
12:12:35 – 12:13:05
DEMO2 - REC_049.AVI
9:11:08 – 9:12:08
DEMO3 - DEMO3 - 071231_Nealley 41m25s.AVI
10:41:18 – 10:41:31
DEMO5 - Dione.lc
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