Table information for 'bgds2.ssa_time_series'
General
Table Description:
This table contains metadata about the photometric time series from
BGDS in IVOA SSA format. The actual data is available through a
datalink service or in the lc_allband table.
This table is not
available for
ADQL queries and through the
TAP endpoint.
Resource Description:
From the Bochum Galactic Disk Survey, time series have been obtained in the
r and i bands on an (up to) nightly basis. Depending on the field, the time
series contain up to more than 300 nights over 9 years. Each measurement in
r and i represents the averaged flux over 10 minutes of observation
(from 9 averaged 10s images). Additionally, intermittent measurements
in Johnson UVB, Sloan z and the narrowbands OIII, NB, Halpha and SII
have been recorded as well.
The Bochum Galactic Disk Survey is a project to monitor the stellar content
of the Galactic disk in a 6 degree wide stripe centered on the Galactic
plane. The data has been recorded from September 2010 to September 2019 in
Sloan r and i simultaneously with the Robotic Bochum Twin Telescope (RoBoTT)
at the Universitaetssternwarte Bochum near Cerro Armazones in the Chilean
Atacama desert. It contains measurements of about 2x10^7 stars over nine
years.
The source images are available from ivo://org.gavo.dc/bgds/q/sia.
For a list of all services and tables belonging
to this table's
resource, see Information on resource 'BGDS DR2 time series'
Citing this table
To cite the table as such, we suggest the following
BibTeX entry:
@MISC{vo:bgds2_ssa_time_s,
year=2024,
title={{BGDS} DR2 time series},
author={Hackstein, M. and Haas, M. and Fein, C. and Chini, R.},
url={http://dc.zah.uni-heidelberg.de/tableinfo/bgds2.ssa_time_series},
howpublished={{VO} resource provided by the {GAVO} Data Center}
}
Copyright, License, Acknowledgements
If you use GDS data, please cite
2015AN....336..590H.
Resource Documentation
The time series from BGDS DR2 by default come as IVOA Spectral Data Model
compliant VOTables. If you what plain text instead, add
&format=txt to the dlget URIs. The columns you get back then
are epoch in MJD, magnitude and magnitude error in mag, and a link to
a cutout showing where the measurement came from.
Columns
Sorted alphabetically. [Sort by DB column index]
| Name | Table Head |
Description | Unit | UCD |
|---|
| accref |
Product key |
Access key for the data
|
N/A |
meta.ref.url;meta.dataset |
| accsize |
File size |
Size of the data in bytes
|
byte |
N/A |
| amp |
Amplitude |
Difference between brightest and weakest observation.
|
mag |
phot.mag;em.opt.U;arith.diff |
| dec |
Dec |
ICRS declination for this object.
|
N/A |
pos.eq.dec;meta.main |
| embargo |
Embargo ends |
Date the data will become/became public
|
yr |
N/A |
| field |
Field |
Survey field observed.
|
N/A |
meta.id;obs.field |
| mags |
mag[] |
An array containing the magnitude for the times in mjd
|
mag |
phot.mag |
| med_mag |
〈mag〉 |
Median magnitude in the band given by filter
|
mag |
phot.mag |
| mime |
Type |
MIME type of the file served
|
N/A |
meta.code.mime |
| mjds |
T[] |
An array containing the time values of the time series
|
d |
time.epoch |
| obs_id |
Obs_id |
Main identifier of this observation (a single object may have multiple observations in different bands and fields)
|
N/A |
meta.id;meta.main |
| owner |
Owner |
Owner of the data
|
N/A |
N/A |
| ra |
Ra |
ICRS right ascension for this object.
|
N/A |
pos.eq.ra;meta.main |
| ssa_aperture |
Aperture |
Angular diameter of aperture
|
deg |
phys.angSize;instr.fov |
| ssa_bandpass |
Bandpass |
Bandpass (i.e., rough spectral location) of this dataset; this should be the most appropriate term from the vocabulary http://www.ivoa.net/rdf/messenger.
|
N/A |
instr.bandpass |
| ssa_binSize |
Spect. Bin |
Bin size in wavelength
|
m |
em.wl;spect.binSize |
| ssa_cdate |
Proc. Date |
Processing/Creation date
|
N/A |
time;meta.dataset |
| ssa_collection |
Collection |
A short handle naming the collection this spectrum belongs to.
|
N/A |
N/A |
| ssa_creationtype |
Using |
Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction)
|
N/A |
N/A |
| ssa_creator |
Creator |
Creator of the datasets included here.
|
N/A |
N/A |
| ssa_creatorDID |
C. DID |
Dataset identifier assigned by the creator
|
N/A |
meta.id |
| ssa_cversion |
C. Version |
Creator assigned version for this dataset (will be incremented when this particular item is changed).
|
N/A |
meta.version;meta.dataset |
| ssa_datasource |
Src |
Method of generation for the data (one of survey, pointed, theory, custom, artificial).
|
N/A |
N/A |
| ssa_dateObs |
Date Obs. |
Midpoint of exposure (MJD)
|
d |
time.epoch |
| ssa_dstitle |
Title |
A compact and descriptive designation of the dataset.
|
N/A |
meta.title;meta.dataset |
| ssa_dstype |
Data type |
Type of data (spectrum, time series, etc)
|
N/A |
N/A |
| ssa_fluxcalib |
Calib Flux |
Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).
|
N/A |
N/A |
| ssa_fluxStatError |
Err. flux |
Statistical error in flux
|
s**-1 |
stat.error;phot.flux.density;em |
| ssa_fluxSysError |
Sys. Err flux |
Systematic error in flux
|
s**-1 |
stat.error.sys;phot.flux.density;em |
| ssa_instrument |
Instrument |
Instrument or code used to produce these datasets
|
N/A |
meta.id;instr |
| ssa_length |
Length |
Number of points in the spectrum
|
N/A |
N/A |
| ssa_location |
Location |
ICRS location of aperture center
|
deg |
pos.eq |
| ssa_pdate |
Pub. Date |
Date last published.
|
N/A |
N/A |
| ssa_pubDID |
P. DID |
Dataset identifier assigned by the publisher
|
N/A |
meta.ref.ivoid |
| ssa_publisher |
Publisher |
Publisher of the datasets included here.
|
N/A |
meta.curation |
| ssa_redshift |
z |
Redshift of target object
|
N/A |
src.redshift |
| ssa_reference |
Ref. |
URL or bibcode of a publication describing this data.
|
N/A |
meta.bib.bibcode |
| ssa_snr |
SNR |
Signal-to-noise ratio estimated for this dataset
|
N/A |
stat.snr |
| ssa_speccalib |
Calib. Spect. |
Type of wavelength calibration
|
N/A |
meta.code.qual |
| ssa_specend |
Band end |
Upper value of spectral coordinate
|
m |
em.wl;stat.max |
| ssa_specext |
Bandwidth |
Width of the spectrum
|
m |
instr.bandwidth |
| ssa_specmid |
Mid. Band |
Midpoint of region covered in this dataset
|
m |
instr.bandpass |
| ssa_specres |
Spec. Res. |
Resolution (in meters of wavelength) on the spectral axis
|
m |
spect.resolution;em.wl |
| ssa_specstart |
Band start |
Lower value of spectral coordinate
|
m |
em.wl;stat.min |
| ssa_spectStatError |
Err. Spect |
Statistical error in wavelength
|
m |
stat.error;em |
| ssa_spectSysError |
Sys. Err. Spect |
Systematic error in wavelength
|
m |
stat.error.sys;em |
| ssa_targclass |
Ob. cls |
Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible)
|
N/A |
src.class |
| ssa_targetpos |
Obj. pos |
Equatorial (ICRS) position of the target object.
|
N/A |
pos.eq;src |
| ssa_targname |
Object |
Common name of object observed.
|
N/A |
meta.id;src |
| ssa_timeExt |
Exp. Time |
Exposure duration
|
s |
time.duration |
| time_max |
Last Obs |
Last timestamp in time series (MJD Topocentric UTC)
|
d |
time.epoch;stat.max |
| time_min |
1st Obs |
First timestamp in time series (MJD Topocentric UTC)
|
d |
time.epoch;stat.min |
Columns that are parts of indices are marked
like this.
Other
The following services may use the data contained in this
table:
VOResource
VO nerds may sometimes need
VOResource XML for this table.
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