Information on Service 'AAVSO Photometric All Sky Survey (APASS) DR10'

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AAVSO Photometric All-Sky Survey (APASS), underway since 2010, covers the entire sky from 7.5 < V < 16.5 magnitude, and in the BVugrizY bandpasses. A northern and a southern site are used, each with twin ASA 20cm astrographs and Apogee Aspen CG16m cameras, covering 2.9x2.9 square degrees with 2.6arcsec pixels. Landolt and SDSS standards are used for all-sky solutions, with typical 0.02mag calibration errors on the bright end.

Data Release 10 is a complete reprocessing of all 500K images taken with the system, including hundreds of nights not part of DR9. Sextractor is used for star finding and centroiding; DAOPHOT is used for aperture photometry; the astrometry.net plate-solving library is used for basic astrometry, supplanted with more precise WCS that utilizes knowledge of the optical train distortions. With these changes, DR10 includes many more stars than prior releases.

More information is available at http://www.aavso.org/apass.

For a list of all services and tables belonging to this service's resource, see Information on resource 'AAVSO Photometric All Sky Survey (APASS) DR10'

Overview

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This service is published as follows:

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Spatial Coverage

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

NameTable Head DescriptionUnitUCD
DEC Delta (ICRS) Declination (ICRS decimal) deg pos.eq.dec
hscs_pos Position/Name Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object N/A N/A
hscs_sr Search radius Search radius in arcminutes N/A N/A
MAXREC Match limit Maximum number of records returned. Pass 0 to retrieve service parameters. N/A N/A
RA Alpha (ICRS) Right Ascension (ICRS decimal) deg pos.eq.ra
RESPONSEFORMAT Output Format File format requested for output. N/A meta.code.mime
SR Search Radius Search radius deg N/A
VERB Verbosity Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns. N/A N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

NameTable Head DescriptionUnitUCD
_r Dist. Distance to cone center deg pos.distance
dec Dec ICRS declination for this object. N/A pos.eq.dec;meta.main
dec_error Err. Dec Estimated error in dec (there will be additional systematics especially in crowded fields). deg stat.error;pos.eq.dec
err_mag_b Err B Estimated error in mag_b. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.B
err_mag_g Err g Estimated error in mag_g. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.V
err_mag_i Err i Estimated error in mag_i. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I
err_mag_r Err r Estimated error in mag_r. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.R
err_mag_u Err u Estimated error in mag_u. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.U
err_mag_v Err V Estimated error in mag_v. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.V
err_mag_y Err Y Estimated error in mag_y. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I
err_mag_z_s Err z_s Estimated error in mag_z_s. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I
id Id APASS DR10 identifier formed as (SPD zone)-(star number) N/A meta.id;meta.main
mag_b Mag B Magnitude in Johnson B (Vega system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.B
mag_g Mag g Magnitude in Sloan g' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.V
mag_i Mag i Magnitude in Sloan i' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I
mag_r Mag r Magnitude in Sloan r' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.R
mag_u Mag u Magnitude in Sloan u' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.U
mag_v Mag V Magnitude in Johnson V (Vega system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.V
mag_y Mag Y Magnitude in Sloan Y (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I
mag_z_s Mag z_s Magnitude in Sloan z_s (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I
nobs_b N(B) Number of observations that went into mag_b N/A meta.number;obs;em.opt.B
nobs_g N(g) Number of observations that went into mag_g N/A meta.number;obs;em.opt.V
nobs_i N(i) Number of observations that went into mag_i N/A meta.number;obs;em.opt.I
nobs_r N(r) Number of observations that went into mag_r N/A meta.number;obs;em.opt.R
nobs_u N(u) Number of observations that went into mag_u N/A meta.number;obs;em.opt.U
nobs_v N(V) Number of observations that went into mag_v N/A meta.number;obs;em.opt.V
nobs_y N(Y) Number of observations that went into mag_y N/A meta.number;obs;em.opt.I
nobs_z_s N(z_s) Number of observations that went into mag_z_s N/A meta.number;obs;em.opt.I
ra Ra ICRS right ascension for this object. N/A pos.eq.ra;meta.main
ra_error Err. RA Estimated error in ra (there will be additional systematics especially in crowded fields). deg stat.error;pos.eq.ra

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

NameTable Head DescriptionUnitUCD Verb. Level
id Id APASS DR10 identifier formed as (SPD zone)-(star number) N/A meta.id;meta.main 1
ra Ra ICRS right ascension for this object. N/A pos.eq.ra;meta.main 1
dec Dec ICRS declination for this object. N/A pos.eq.dec;meta.main 1
mag_b Mag B Magnitude in Johnson B (Vega system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.B 5
mag_v Mag V Magnitude in Johnson V (Vega system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.V 5
mag_u Mag u Magnitude in Sloan u' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.U 5
mag_g Mag g Magnitude in Sloan g' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.V 5
mag_r Mag r Magnitude in Sloan r' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.R 5
mag_i Mag i Magnitude in Sloan i' (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I 5
mag_z_s Mag z_s Magnitude in Sloan z_s (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I 5
mag_y Mag Y Magnitude in Sloan Y (AB system). This is an aperture magnitude obtained with DAOPHOT. mag phot.mag;em.opt.I 5
_r Dist. Distance to cone center deg pos.distance 10
ra_error Err. RA Estimated error in ra (there will be additional systematics especially in crowded fields). deg stat.error;pos.eq.ra 15
dec_error Err. Dec Estimated error in dec (there will be additional systematics especially in crowded fields). deg stat.error;pos.eq.dec 15
nobs_b N(B) Number of observations that went into mag_b N/A meta.number;obs;em.opt.B 15
err_mag_b Err B Estimated error in mag_b. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.B 15
nobs_v N(V) Number of observations that went into mag_v N/A meta.number;obs;em.opt.V 15
err_mag_v Err V Estimated error in mag_v. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.V 15
nobs_u N(u) Number of observations that went into mag_u N/A meta.number;obs;em.opt.U 15
err_mag_u Err u Estimated error in mag_u. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.U 15
nobs_g N(g) Number of observations that went into mag_g N/A meta.number;obs;em.opt.V 15
err_mag_g Err g Estimated error in mag_g. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.V 15
nobs_r N(r) Number of observations that went into mag_r N/A meta.number;obs;em.opt.R 15
err_mag_r Err r Estimated error in mag_r. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.R 15
nobs_i N(i) Number of observations that went into mag_i N/A meta.number;obs;em.opt.I 15
err_mag_i Err i Estimated error in mag_i. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I 15
nobs_z_s N(z_s) Number of observations that went into mag_z_s N/A meta.number;obs;em.opt.I 15
err_mag_z_s Err z_s Estimated error in mag_z_s. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I 15
nobs_y N(Y) Number of observations that went into mag_y N/A meta.number;obs;em.opt.I 15
err_mag_y Err Y Estimated error in mag_y. From a comparison with DR9, it appears these estimates are overly pessimistic. mag stat.error;phot.mag;em.opt.I 15

Copyright, License, Acknowledgements

If you use this data in a paper, please include the following acknowledgement: “This paper makes use of data from the AAVSO Photometric All Sky Survey, whose funding has been provided by the Robert Martin Ayers Sciences Fund and from the NSF (AST-1412587).”

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