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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
apass9.sam 147 1000 The APASS catalog, sample output
(on a total of 62 million sources)
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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
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Bytes Format Units Label Explanations
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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)
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Note (1): Uncertainty flag as follows:
0 = Standard deviation of N observations
1 = Poissonian error (unique observation)
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Acknowledgements:
Arne Henden [AAVSO]
(End) Arne Henden [AAVSO], Emmanuelle Perret [CDS] 27-Jan-2016