Information on Service 'OGLE Time Series Browser Service'

[Use this service from your browser]

Further access options are discussed below

The Optical Gravitational Lensing Experiment (OGLE) is a long-term photometric survey operated by the University of Warsaw at Las Campanas Observatory. Most of the observations are carried out in the Cousins I filter, with auxiliary measurements in the V filter.

High-cadence, long-term observations of crowded fields have led to the systematic discovery and classification of variable stars. The OGLE Collection of Variable Stars (OCVS) contains over one million objects. OCVS light curves span three survey phases: OGLE-II (1996-2000), OGLE-III (2001-2009), and OGLE-IV (2010-present).

The VO-compliant re-publication of the OCVS light curve collection allows bulk download for objects with a specific variability class and parameters, which can be very handy for ML-based light curve analysis and related applications.

The original data of the republished collection can be found at: https://www.astrouw.edu.pl/ogle/ogle4/OCVS/.

While republishing, we almost preserve the original data structure. That is, there are tables with variable star parameters split by variability type (Cepheids, Eclipsing and Ellipsoidal Binaries, RR Lyrae stars, etc.) and by sky field: Galactic Bulge (BLG), Magellanic Clouds (LMC, SMC), Galactic Disc (GD). A few tables are related only to a variability class (e.g., Cataclysmic Variables - CV, BLAPs, Anomalous Cepheids in the Milky Way - ACEP/GAL) or a specific field (M54 variables, which comprise diverse classes).

All observed objects with their main parameters are aggregated in the object_all table, which facilitates generic queries across all classes. This table is served by Cone Search.

The ts_ssa table is the main table for light-curve queries. It is served by TAP and SSA services. The time series themselves, as well as previews of folded and unfolded light curves, can be accessed via DataLink from the ts_ssa and ObsCore tables. Direct links to previews of folded curves are placed in the preview column of both the ts_ssa and ObsCore tables.

For a list of all services and tables belonging to this service's resource, see Information on resource 'OGLE Time series'

Service Documentation

The original OCVS data are provided as a set of tables with stellar parameters, split by variable-star class and sky field. Indeed, different variability classes have different sets of parameters. We preserve the division by variability class, but aggregate stars of a given class from all fields into unified tables with corresponding names, such as cepheids for Classical Cepheids or eclipsing for Eclipsing Binaries and so on. This allows more precise, variability-class–specific queries.

All observed objects, together with their basic parameters, are aggregated in the object_all table, which facilitates generic queries across all classes. This table is served via Cone Search.

The ts_ssa table is the main table for light-curve queries. It is served by TAP and SSA services. The time series themselves, as well as previews of folded and unfolded light curves, can be accessed via DataLink from the ts_ssa and ObsCore tables. Direct links to previews of folded curves are placed in the preview column of both the ts_ssa and ObsCore tables.

ADQL Query Examples

Download all RR Lyrae light curves with period in [0.5–0.7 days] range in the I band:

SELECT ssa_targname, accref, o.period FROM ogle.ts_ssa AS t JOIN ogle.rrlyr AS o
ON t.ssa_targname = o.object_id
WHERE o.period BETWEEN 0.5 AND 0.7 AND t.ssa_bandpass = 'I'

Download all previews of the light curves with epochs (time of maximum brightness) in the future:

SELECT * from ogle.objects_all WHERE epoch > ivo_to_mjd('2027-01-01')

Find all stars with periods longer than the duration of observations in I filter:

SELECT o.* FROM ogle.objects_all o JOIN ogle.ts_ssa t ON o.object_id = t.ssa_targname
AND t.ssa_bandpass='I' WHERE o.period > ssa_timeext

Select ten eclipsing binary systems, classified as "Contact" with the longest periods:

SELECT TOP 10 accref, preview, o.* FROM ogle.eclipsing o JOIN ogle.ts_ssa t ON o.object_id = t.ssa_targname
WHERE subtype='C' and ssa_length>100 ORDER BY o.period DESC

Overview

You can access this service using:

Coverage

Intervals of messenger energies reflected in this resource: 1.12713 2.55638 eV

Time covered by this resource's data: 1995.77 2024.42

This resource is not (directly) published. This can mean that it was deemed too unimportant, for internal use only, or is just a helper for a published service. Equally likely, however, it is under development, abandoned in development or otherwise unfinished. Exercise some caution.

Other services provided on the underlying data include:

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
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_location Location ICRS location of aperture center deg pos.eq
ssa_targname Target Object Common name of object observed. N/A meta.id;src
t_max Max. t Upper bound of times represented in the data set d time.end;obs.exposure
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure

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
accref Product key Access key for the data N/A meta.ref.url;meta.dataset
datalink Datalink A link to a datalink document for this spectrum. N/A meta.ref.url
location_dec Dec N/A deg pos.eq.dec;meta.main
location_ra RA N/A deg pos.eq.ra;meta.main
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_targname Object Common name of object observed. N/A meta.id;src
t_max Max. t Upper bound of times represented in the data set d time.end;obs.exposure
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure

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
accref Product key Access key for the data N/A meta.ref.url;meta.dataset 1
mean_mag Mean magnitude Stellar magnitude mag phot.mag;stat.mean 1
ssa_location Location ICRS location of aperture center deg pos.eq 5
ssa_dateObs Date Obs. Midpoint of exposure (MJD) d time.epoch 5
ssa_timeExt Exp. Time Exposure duration s time.duration 5
ssa_length Length Number of points in the spectrum N/A N/A 5
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure 10
t_max Max. t Upper bound of times represented in the data set d time.end;obs.exposure 10
accsize File size Size of the data in bytes byte N/A 11
ssa_dstitle Title A compact and descriptive designation of the dataset. N/A meta.title;meta.dataset 15
ssa_creatorDID C. DID Dataset identifier assigned by the creator N/A meta.id 15
ssa_pubDID P. DID Dataset identifier assigned by the publisher N/A meta.ref.ivoid 15
ssa_cdate Proc. Date Processing/Creation date N/A time;meta.dataset 15
ssa_pdate Pub. Date Date last published. N/A N/A 15
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 15
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 15
ssa_targname Object Common name of object observed. N/A meta.id;src 15
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 15
ssa_redshift z Redshift of target object N/A src.redshift 15
ssa_targetpos Obj. pos Equatorial (ICRS) position of the target object. N/A pos.eq;src 15
ssa_snr SNR Signal-to-noise ratio estimated for this dataset N/A stat.snr 15
ssa_aperture Aperture Angular diameter of aperture deg phys.angSize;instr.fov 15
ssa_specmid Mid. Band Midpoint of region covered in this dataset m instr.bandpass 15
ssa_specext Bandwidth Width of the spectrum m instr.bandwidth 15
ssa_specstart Band start Lower value of spectral coordinate m em.wl;stat.min 15
ssa_specend Band end Upper value of spectral coordinate m em.wl;stat.max 15
ssa_csysName Sys System RA and Dec are given in N/A N/A 15
ssa_spectralucd UCD(spectral) UCD of the spectral column in the spectra served; when you have wavelengths, use em.wl for vacuum wavelengths, em.wl;obs.atmos for air wavelengths. N/A meta.ucd 15
ssa_spectralunit unit(spectral) Unit of the spectral column N/A meta.unit 15
ssa_fluxucd UCD(flux) UCD of the flux column N/A meta.ucd 15
ssa_fluxunit unit(flux) Unit of the flux column N/A meta.unit 15
ssa_publisher Publisher Publisher of the datasets included here. N/A meta.curation 15
ssa_creator Creator Creator of the datasets included here. N/A N/A 15
ssa_collection Collection A short handle naming the collection this spectrum belongs to. N/A N/A 15
ssa_instrument Instrument Instrument or code used to produce these datasets N/A meta.id;instr 15
ssa_datasource Src Method of generation for the data (one of survey, pointed, theory, custom, artificial). N/A N/A 15
ssa_creationtype Using Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction) N/A N/A 15
ssa_reference Ref. URL or bibcode of a publication describing this data. N/A meta.bib.bibcode 15
ssa_fluxStatError Err. flux Statistical error in flux N/A stat.error;phot.flux.density;em 15
ssa_fluxSysError Sys. Err flux Systematic error in flux N/A stat.error.sys;phot.flux.density;em 15
ssa_fluxcalib Calib Flux Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED). N/A N/A 15
ssa_binSize Spect. Bin Bin size in wavelength m em.wl;spect.binSize 15
ssa_spectStatError Err. Spect Statistical error in wavelength m stat.error;em 15
ssa_spectSysError Sys. Err. Spect Systematic error in wavelength m stat.error.sys;em 15
ssa_speccalib Calib. Spect. Type of wavelength calibration N/A meta.code.qual 15
ssa_specres Spec. Res. Resolution (in meters of wavelength) on the spectral axis m spect.resolution;em.wl 15
ssa_spaceError Err. Spc Statistical error in position deg stat.error;pos.eq 15
ssa_spaceCalib Calib. Spc Type of calibration in spatial coordinates N/A meta.code.qual 15
ssa_spaceRes Res. Spc Spatial resolution of data deg pos.angResolution 15
datalink Datalink A link to a datalink document for this spectrum. N/A meta.ref.url 15
mime Type MIME type of the file served N/A meta.code.mime 20
ssa_model Model Data model name and version N/A N/A 20
ssa_timeSI [Time] Time conversion factor in Osuna-Salgado convention. N/A N/A 20
ssa_spectralSI [Spectral] Spectral conversion factor in Osuna-Salgado convention N/A N/A 20
ssa_fluxSI [Flux] Flux/magnitude conversion factor in Osuna-Salgado convention N/A N/A 20
ssa_dstype Data type Type of data (spectrum, time series, etc) N/A N/A 20
period Period Period of the variable star (primary/longest) d src.var;time.period 20
epoch Epoch Time of maximum brightness; mjd (HJD) d src.var;time.epoch 20
owner Owner Owner of the data N/A N/A 25
embargo Embargo ends Date the data will become/became public yr N/A 25
ssa_region Coverage Rough coverage based on location and aperture. N/A pos.outline;obs.field 30

If you use or refer to the data obtained from this catalog in your scientific work, please cite the appropriate papers:
bibcode:2015AcA....65....1U (OGLE-IV photometry)
bibcode:2008AcA....58...69U (OGLE-III photometry)

Citation Info

VOResource XML (that's something exclusively for VO nerds)