Digitized First Byurakan Survey (DFBS) Spectra Query Service
Short Name:
DFBS SSAP
Date:
27 Dec 2024 08:31:13
Publisher:
The GAVO DC team
Description:
The First Byurakan Survey (FBS) is the largest and the first systematic
objective prism survey of the extragalactic sky. It covers 17,000 sq.deg.
in the Northern sky together with a high galactic latitudes region in the
Southern sky. The FBS has been carried out by B.E. Markarian, V.A.
Lipovetski and J.A. Stepanian in 1965-1980 with the Byurakan Observatory
102/132/213 cm (40"/52"/84") Schmidt telescope using 1.5 deg. prism. Each
FBS plate contains low-dispersion spectra of some 15,000-20,000 objects;
the whole survey consists of about 20,000,000 objects.
The EPN-TAP 2.0 version of the complete asteroid data from the Minor
Planet Center (MPC), updated once per month. The MPC operates at the
Smithsonian Astrophysical Observatory under the auspices of Division
III of the International Astronomical Union (IAU).
The MPC Orbit database contains orbital elements of minor planets that
have been published in the Minor Planet Circulars, the Minor Planet
Orbit Supplement and the Minor Planet Electronic Circulars.
Spectra from the Flash and Heros Echelle spectrographs developed at
Landessternwarte Heidelberg and mounted at La Silla and various other
observatories. The data mostly contains spectra of OB stars. Heros was
the name of the instrument after Flash got a second channel in 1995.
Spectra from the Flash and Heros Echelle spectrographs developed at
Landessternwarte Heidelberg and mounted at La Silla and various other
observatories. The data mostly contains spectra of OB stars. Heros was
the name of the instrument after Flash got a second channel in 1995.
This table, corresponding to gaia_source of the full DR1, contains
the 1.15 billion objects reliably detected in the first 14 months of
Gaia observations. It essentially consists of high-precision positions
and magnitudes. The TGAS subset (about 2 million objects observed by
both Gaia and Hipparcos) has proper motions and parallaxes. Users are
advised to beware strong correlations between the astrometric
parameters present for some of the less densely observed objects and
the inhomogeneous coverage in this first data release (solution id:
1635378410781933568).
A table of the light curves released with Gaia DR2 (about half a million
in total). In each Gaia band (G, BP, RP), we give epochs, fluxes and
their errors in arrays. We do not include the quality flags (DR2: “may
be safely ignored for many general purpose applications”). You can
access them through the associated datalink service if you select
source_id. You will usually join this table with gaia.dr2light.
We have also removed all entries with NaN observation times; hence,
the array lengths in the different bands can be significantly different,
and the indices in transit_ids do not always correspond to the
indices in the time series.
Furthermore, we only give fluxes and their errors here rather than
magnitudes. Fluxes can be turned into magnitude using::
mag = -2.5 log10(flux)+zero point,
where the zero points assumed for Gaia DR2 are
25.6884±0.0018 in G, 25.3514±0.0014 in BP, and
24.7619±0.0019 in RP (VEGAMAG).
This schema contains data re-published from the official
Gaia mirrors (such as ivo://uni-heidelberg.de/gaia/tap) either to
support combining its data with local tables (the various Xlite tables)
or to make the data more accessible to VO clients (e.g., epoch fluxes).
Other Gaia-related data is found in, among others, the gdr2dist, gdr3mock,
gdr3spec, gedr3auto, gedr3dist, gedr3mock, and gedr3spur schemas.
This service exposes about 0.5 million light curves of stars
classified as variable by the Gaia analysis system through the VO SSAP
protocol. The lightcurves are published per-band and are also
available through obscore.