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

Further access options are discussed below

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

You can access this service using:

scs.xml -- a standard SCS interface as defined by the IVOA to access catalog-type data; SCS clients use http://dc.g-vo.org/apass/q/cone/scs.xml? to access the service
form -- an interface for web browsers through an HTML form

Coverage

This service is published as follows:

Within the set(s) ivo_managed with the renderer dali
Within the set(s) ivo_managed,local with the renderer form
Within the set(s) ivo_managed with the renderer scs.xml

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

Input Fields

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

Name	Table Head	Description	Unit	UCD
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.

Name	Table Head	Description	Unit	UCD
_r	Dist.	Distance to cone center	deg	pos.angDistance
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.

Name	Table Head	Description	Unit	UCD	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.angDistance	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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