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={https://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 by DB column index. [Sort alphabetically]
| Name | Table Head |
Description | Unit | UCD |
|---|
| accref |
Product key |
Access key for the data
|
N/A |
meta.ref.url;meta.dataset |
| owner |
Owner |
Owner of the data
|
N/A |
N/A |
| embargo |
Embargo ends |
Date the data will become/became public
|
yr |
N/A |
| mime |
Type |
MIME type of the file served
|
N/A |
meta.code.mime |
| accsize |
File size |
Size of the data in bytes
|
byte |
N/A |
| ssa_dstitle |
Title |
A compact and descriptive designation of the dataset.
|
N/A |
meta.title;meta.dataset |
| ssa_creatorDID |
C. DID |
Dataset identifier assigned by the creator
|
N/A |
meta.id |
| ssa_pubDID |
P. DID |
Dataset identifier assigned by the publisher
|
N/A |
meta.ref.ivoid |
| ssa_cdate |
Proc. Date |
Processing/Creation date
|
N/A |
time;meta.dataset |
| ssa_pdate |
Pub. Date |
Date last published.
|
N/A |
N/A |
| 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_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_targname |
Object |
Common name of object observed.
|
N/A |
meta.id;src |
| 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_redshift |
z |
Redshift of target object
|
N/A |
src.redshift |
| ssa_targetpos |
Obj. pos |
Equatorial (ICRS) position of the target object.
|
N/A |
pos.eq;src |
| ssa_snr |
SNR |
Signal-to-noise ratio estimated for this dataset
|
N/A |
stat.snr |
| ssa_location |
Location |
ICRS location of aperture center
|
deg |
pos.eq |
| ssa_aperture |
Aperture |
Angular diameter of aperture
|
deg |
phys.angSize;instr.fov |
| ssa_dateObs |
Date Obs. |
Midpoint of exposure (MJD)
|
d |
time.epoch |
| ssa_timeExt |
Exp. Time |
Exposure duration
|
s |
time.duration |
| ssa_specmid |
Mid. Band |
Midpoint of region covered in this dataset
|
m |
instr.bandpass |
| ssa_specext |
Bandwidth |
Width of the spectrum
|
m |
instr.bandwidth |
| ssa_specstart |
Band start |
Lower value of spectral coordinate
|
m |
em.wl;stat.min |
| ssa_specend |
Band end |
Upper value of spectral coordinate
|
m |
em.wl;stat.max |
| ssa_length |
Length |
Number of points in the spectrum
|
N/A |
N/A |
| ssa_dstype |
Data type |
Type of data (spectrum, time series, etc)
|
N/A |
N/A |
| ssa_publisher |
Publisher |
Publisher of the datasets included here.
|
N/A |
meta.curation |
| ssa_creator |
Creator |
Creator of the datasets included here.
|
N/A |
N/A |
| ssa_collection |
Collection |
A short handle naming the collection this spectrum belongs to.
|
N/A |
N/A |
| ssa_instrument |
Instrument |
Instrument or code used to produce these datasets
|
N/A |
meta.id;instr |
| ssa_datasource |
Src |
Method of generation for the data (one of survey, pointed, theory, custom, artificial).
|
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_reference |
Ref. |
URL or bibcode of a publication describing this data.
|
N/A |
meta.bib.bibcode |
| 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_fluxcalib |
Calib Flux |
Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED).
|
N/A |
N/A |
| ssa_binSize |
Spect. Bin |
Bin size in wavelength
|
m |
em.wl;spect.binSize |
| 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_speccalib |
Calib. Spect. |
Type of wavelength calibration
|
N/A |
meta.code.qual |
| ssa_specres |
Spec. Res. |
Resolution (in meters of wavelength) on the spectral axis
|
m |
spect.resolution;em.wl |
| 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 |
| time_min |
1st Obs |
First timestamp in time series (MJD Topocentric UTC)
|
d |
time.epoch;stat.min |
| time_max |
Last Obs |
Last timestamp in time series (MJD Topocentric UTC)
|
d |
time.epoch;stat.max |
| amp |
Amplitude |
Difference between brightest and weakest observation.
|
mag |
phot.mag;em.opt.U;arith.diff |
| med_mag |
〈mag〉 |
Median magnitude in the band given by filter
|
mag |
phot.mag |
| field |
Field |
Survey field observed.
|
N/A |
meta.id;obs.field |
| ra |
Ra |
ICRS right ascension for this object.
|
N/A |
pos.eq.ra;meta.main |
| dec |
Dec |
ICRS declination for this object.
|
N/A |
pos.eq.dec;meta.main |
| mjds |
T[] |
An array containing the time values of the time series
|
d |
time.epoch |
| mags |
mag[] |
An array containing the magnitude for the times in mjd
|
mag |
phot.mag |
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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