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II/336       AAVSO Photometric All Sky Survey (APASS) DR9       (Henden+, 2016)

APASS: The AAVSO Photometric All-Sky Survey - Data Release 9 Henden A.A., Templeton M., Terrell D., Smith T.C., Levine S., Welch D. <American Association of Variable Star Observers (AAVSO) (2016)> =2015AAS...22533616H =2016yCat.2336....0H
ADC_Keywords: Stars, variable ; Photometry, UBV ; Photometry, SDSS Description: The AAVSO Photometric All Sky Survey (APASS) project is designed to bridge the gap between the shallow Tycho2 two-bandpass photometric catalog that is complete to V=11 and the deeper, but less spatially-complete catalogs like SDSS or PanSTARRS. It can be used for calibration of a specific field; for obtaining spectral information about single sources, determining reddening in a small area of the sky; or even obtaining current-epoch astrometry for rapidly moving objects. The survey is being performed at two locations: near Weed, New Mexico in the Northern Hemisphere; and at CTIO in the Southern Hemisphere. Each site consists of dual bore-sighted 20cm telescopes on a single mount, designed to obtain two bandpasses of information simultaneously. Each telescope covers 9 square degrees of sky with 2.5arcsec pixels, with the main survey taken with B,V,g',r',i' filters and covering the magnitude range 10<V<17. A bright extension is underway, saturating at V=7 and extending the wavelength coverage from u' to Y. The current catalog is Data Release 9 and contains approximately 62 million stars. The American Association of Variable Star Observers is responsible for the overall management of the survey; a team of professional astronomers participate in the data analysis. The project was initially funded by the Robert Martin Ayers Sciences Fund, with a follow-on grant from the National Science Foundation. Acknowledging APASS in publications: Please include the following in any published material that makes use of the APASS data products: "This publication makes use of data products from the AAVSO Photometric All Sky Survey (APASS). Funded by the Robert Martin Ayers Sciences Fund and the National Science Foundation." File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file apass9.sam 147 1000 The APASS catalog, sample output (on a total of 62 million sources)
See also: B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014) J/AJ/148/81 : APASS BVgri photometry of RAVE stars. I. Data (Munari+, 2014) J/other/JAD/20.4 : 180 APASS variable stars in Aquarius (Munari+, 2014) J/other/NewA/27.1 : RR Lyrae candidates in Aqr halo stream (Munari+, 2014) http://www.aavso.org/apass : APASS home page Byte-by-byte Description of file: apass9.sam
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right ascension in decimal degrees (J2000) 12- 21 F10.6 deg DEdeg Declination in decimal degrees (J2000) 23- 27 F5.3 arcsec e_RAdeg [0/2.4] RA uncertainty 29- 33 F5.3 arcsec e_DEdeg [0/2.4] DEC uncertainty 35- 44 I10 --- Field [20110001/9999988888] Field name 46- 48 I3 --- nobs [2/387] Number of observed nights 50- 53 I4 --- mobs [2/3476] Number of images for this field, usually nobs*5 55- 60 F6.3 mag B-V [-7.5/13]? B-V color index 62- 67 F6.3 mag e_B-V [0/10.1]? B-V uncertainty 69- 74 F6.3 mag Vmag [5.5/27.4]? Johnson V-band magnitude 76- 81 F6.3 mag e_Vmag [0/7]? Vmag uncertainty 83 I1 --- ueVmag [0/1]? Uncertainty flag on e_Vmag (1) 85- 90 F6.3 mag Bmag [5.4/27.3]? Johnson B-band magnitude 92- 97 F6.3 mag e_Bmag [0/10]? Bmag uncertainty 99 I1 --- ueBmag [0/1]? Uncertainty flag on e_Bmag (1) 101-106 F6.3 mag g'mag [5.9/24.2]? g'-band AB magnitude, Sloan filter 108-113 F6.3 mag e_g'mag [0/9.7]? g'mag uncertainty 115 I1 --- ueg'mag [0/1]? Uncertainty flag on e_g'mag (1) 117-122 F6.3 mag r'mag [5.1/23.9]? r'-band AB magnitude, Sloan filter 124-129 F6.3 mag e_r'mag [0/6.5]? r'mag uncertainty 131 I1 --- uer'mag [0/1]? Uncertainty flag on e_r'mag (1) 133-138 F6.3 mag i'mag [4.2/29.1]? i'-band AB magnitude, Sloan filter 140-145 F6.3 mag e_i'mag [0/9.6]? i'mag uncertainty 147 I1 --- uei'mag [0/1]? Uncertainty flag on e_i'mag (1)
Note (1): Uncertainty flag as follows: 0 = Standard deviation of N observations 1 = Poissonian error (unique observation)
Acknowledgements: Arne Henden [AAVSO]
(End) Arne Henden [AAVSO], Emmanuelle Perret [CDS] 27-Jan-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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