PPMXL is a catalog of positions, proper motions, 2MASS- and optical
photometry of 900 million stars and galaxies, aiming to be complete
down to about V=20 full-sky. It is the result
of a re-reduction of USNO-B1 together with 2MASS to the ICRS as
represented by PPMX. This service additionally provides improved proper
motions computed according to Vickers et al, 2016
(:bibcode:`2016AJ....151...99V`).
Parts I and III of the sixth fundamental catalog, a catalog of
high-precision astrometry for bright stars combining centuries of
ground-based observations as reflected in FK5 with HIPPARCOS
astrometry.
The result contains, in particular for the proper motions,
statistically significant improvements of the Hipparcos data und
represents a system of unprecedented accuracy for these 4150
fundamental stars. The typical mean error in pm is 0.35 mas/year for
878 basic stars, and 0.59 mas/year for the sample of the 3272
additional stars.
This service provides oscillator strengths and transition
probabilities. Mainly based on experimental energy levels, these were
calculated with the pseudo-relativistic Hartree-Fock method including
core-polarization corrections.
The UCD resolver uses the metadata in the current
Registry to suggest UCDs pertinent to natural language column descriptions.
In that, it fulfills a similar function as the `CDS UCD builder`_
but uses an entirely different approach.
.. _CDS UCD builder: http://cdsweb.u-strasbg.fr/UCD/cgi-bin/descr2ucd
The Ultracool Dwarf Companion Catalogue consists of 278 multiple
systems, 32 of which are newly discovered, each with at least one
spectroscopically confirmed Ultracool Dwarf, within a 100 pc
volume-limited sample. This catalogue is compiled using the Gaia
Catalogue of Nearby Stars for stellar primaries and the Gaia Ultracool
Dwarf Sample for low-mass companions and includes 241 doubles, 33
triples, and 4 higher-order systems established from positional,
proper motion, and parallax constraints.
This table contains the metadata for the plates that went into USNO-B
1.0 as best as we can reconstruct it (i.e., largely those that also
make up the Digital Sky Survey DSS). Most of the source files were
obtained from http://www.nofs.navy.mil/data/fchpix/, some additional
contributions came from Dave Monet.
A validator for IVOA identifiers, checking
conformity to version 2 of the specification.
The service returns results in a tabular format, where an identifier is
valid if no row with msg_type="ERROR" is present.
As per DALI, the format of the table returned can be controlled
through the RESPONSEFORMAT parameter; for machine consumption, the
most useful values for that parameter are probably json and votable.
The code used here is available at
http://svn.ari.uni-heidelberg.de/svn/gavo/hdinputs/ivoidval
These are 1.4GHz Very Long Baseline Interferometry images of 532
radio sources with a flux density exceeding 100uJy as determined by
Ibar et al. (2009, MNRAS, 397, 281), obtained between 2010-06-03 and
2010-09-03.
For all fields, we give frames processed using natural weighting to
preserve maximal sensitivity. For the 65 detected sources, we
additionally give frames processed using uniform weighting to suppress
sidelobes (see Middelberg et al. 2013, A&A 551, 97 for details) in
flux density measurements. Some sources have larger images to cover a
larger area because the initial coordinates were not sufficiently
accurate.
The Wide-Field Plate Database (WFPDB_) contains the descriptive information
for the astronomical wide-field (>1°) photographic observations stored in
numerous archives all over the world. The total number of these
observations, obtained since the end of the 19th century with more
then 200 instruments (telescopes) is about 2 550 000 from 509 archives.
The WFPDB is continually being updated, providing currently access to the
information for about 640 000 plates from 117 plate archives (30% of the
estimated total number of wide-field plates)
.. _WFPDB: http://www.skyarchive.org/
The Wide-field Infrared Survey Explorer (WISE) is a space-based imaging
survey of the entire sky in the 3.4 (W1), 4.6 (W2), 12 (W3), and 22 (W4) μm
mid-infrared. This is the project's reliable Source Catalog containing
accurate photometry and astrometry for over 500 million objects.
More details are available in the `Explanatory Supplement`_, which also
has a list of `Cautionary Notes`_.
.. _Explanatory Supplement: http://wise2.ipac.caltech.edu/docs/release/allsky/expsup/sec1_1.html
.. _Cautionary Notes: http://wise2.ipac.caltech.edu/docs/release/allsky/expsup/sec1_4b.html
![To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to PPMXL. For details, see the `Creative Commons CC0 1.0 Public Domain dedication <http://creativecommons.org/publicdomain/zero/1.0/>`_. Of course, you should still give proper credit when using this data as required by good scientific practice. .. image:: /static/img/cc0.png :alt: [CC0]](/registry-search/?f%5BcapabilityType_facet%5D%5B%5D=VOSI+Capabilities&f%5Bpublisher_facet_trim%5D%5B%5D=The+GAVO+DC+team&f%5Brights_facet%5D%5B%5D=To+the+extent+possible+under+law%2C+the+publisher+has+waived+all+copyright+and+related+or+neighboring+rights+to+PPMXL.++For+details%2C+see+the+%60Creative+Commons+CC0+1.0+Public+Domain+dedication+%3Chttp%3A%2F%2Fcreativecommons.org%2Fpublicdomain%2Fzero%2F1.0%2F%3E%60_.++Of+course%2C+you+should+still+give+proper+credit+when+using+this+data+as+required+by+good+scientific+practice.%0A%0A..+image%3A%3A+%2Fstatic%2Fimg%2Fcc0.png%0A+++%3Aalt%3A+%5BCC0%5D%0A%0A){kind=link}