Presentation on theme: "Using the ASAS-3 Database"— Presentation transcript:
1Using the ASAS-3 Database A. Price 97th AAVSO Annual MeetingOctober 16-19, Nantucket, MASpecial Thanks to Sebastian Otero and Mike Simonsen
2ASAS All Sky Automated Survey Prof. Paczynski (Yale)All Sky Automated SurveyProf. Bohdan Paczynski & Dr. Grzegorz PojmańskiInexpensive all sky cameras for every amateur’s backyardPublic dataAAVSO has permission to include ASAS data in the databaseUse for finding comparison starsOr personal projectsASAS-3N (Hawaii)ASAS-3 (Chile)
3ASAS-3 20,000,000 stars Mag 8-14 South of +28o All sky since June, 2006Cadence: 1-3 days36,858 ASAS-2 V Data16,230 ASAS-2 Ic Data105,028 ASAS-3 V Data loaded by Sean Dvorak (DKS)5,896 comp stars based on ASAS-3 data
12Differences between aperture magnitudes is too large Beware of Saturation!Differences between aperture magnitudes is too largeBetter...
13Check the field and other apertures Beware of Crowding!Check the field and other apertures
14Beware of mean mags! Saturation causes artificially low means (DIY) HDSaturation causes artificially low means(DIY)Zero point calibration issues(calibrate using external sources or use old ASAS catalog)
15Using the Data Ignore data sets with <10 obs (star may be on edge) Reported accuracy is based on night-to-night variationAdd 0.05 in quadrature to the ASAS uncertainty and report that number (for now)Submit via Extended FormatUse ASAS3 as the observer codePut “Submitted by X” in the Remarks where X is your observer codePut ASAS in the Chart, Cname and Kname fieldsSend an to so we can credit your observer totalsDatabase is alive and always changingWhen using ASAS data in a publication, describe how you chose which aperture and data set to use.Also, include a citation to:Pojmanski, G. 2002, Acta Astronomica, 52, 397