2008-01-11T16:27:00Z
200
stars
surveys
proper-motions
The USNO-B 1.0 Catalog
The USNO-B catalog is an all-sky catalog
of about 1e9 objects including their proper motions, based on
scans of several sky surveys conducted between 1950 and the late
1990ies.
2003AJ....125..984M
This service uses code provided by Astrometry.net.
For more details visit http://astrometry.net. The field metadata were,
in part, taken from CDS' Vizier service.
/usnob/res/plates/pq/form
/browse/ppmxl
Optical
0/1-112.257e-19 5.369e-19
True
The USNO-B 1.0 catalogue with Barron's
spurious detections removed.
This is the data table of USNO-B. Note that this data set is huge,
and usually your queries will time out unless you specify a
spatial region to search in.
The spurious detections listed by Barron et al (2008),
http://adsabs.harvard.edu/abs/2008AJ....135..414B, have been
removed, albeit with somewhat generous match radius, so
17327425 rows rather than 17224285 were deleted.
Note that the star/galaxy separation flag frequently is
>11 and !=19, which should not be the case according to the
documentation. We left it this way.
Surveys have been mappend onto characters, with A being the first
blue survey. The survey 9 is mapped to survey 8 (i.e., H).
::
M = Existence in a proper motion catalog,
s = object on a diffraction spike,
Y = Correlation with YS4.0 catalog (Monet, in prep.)
//scs#pgs-pos-index
Spurious detections in USNO-B 1.0 as
established by Barron et al, 2008AJ....135..414B.
2008AJ....135..414B
A crossmatch between USNO-B 1.0 and PPMX.
A crossmatch between USNO-B 1.0 and 2MASS.
Plate corrections to USNO-B 1.0 based
on a crossmatch with PPMX
ICRS Corrections by USNO-B1 Plate
For each plate and each survey, this table
gives the mean offsets between the positions of the stars common
to PPMX and USNO-B 1.0 with USNO-B magnitudes between 12.5 and
13.5. To find these, the PPMX positions were brought to the
epoch of the USNO-B plate using the PPMX proper motions.
Note that the infrared surveys have not been processed
since we could not figure out how to map the plate data to
the survey numbers given in USNO-B 1.0.
usnob_q
USNO-B query
`_,
for advanced queries, our USNO-B table is exposed to our
\RSTservicelink{__system__/tap/run/tap}{TAP service}.
]]>
usnob_platecor
Corrections to USNO-B plates from PPMX
This table contains, for each field
that went into USNO-B1, a correction derived from matching
the USNO-B1 positions for that plate with the PPMX ones (used
as a representation of ICRS) and deriving a mean offset of the
objects from that particular plate for them. We did not
attempt to derive magnitude-dependent corrections (although it is
known that the true residuals depend on both magnitude and color).
/tap/sync
rows = self.getVOTableRows()
self.assertEqual(len(rows), 1)
row = rows[0]
self.assertAlmostEqual(row["e_DEdeg"], 1.1111100093330606e-06)
self.assertAlmostEqual(row["R2mag"], 15.71000003814697)
self.assertAlmostEqual(row["pmDE"], -2.77778008239693e-06)
self.assertAlmostEqual(row["Epoch"], 1986.9000244140625)
self.assertEqual(row["B2eta"], 0.0)
self.assertEqual(row["B1eta"], None)
/tap/sync
# if there's a : in the host part, this decides we're running
# a "local" test, where the spurious detections have not been
# cleaned. Otherwise it's the actual service with a cleaned table.
local = ":" in self.url.httpURL.split("/")[2]
rows = self.getVOTableRows()
if local:
self.assertEqual(len(rows), 1)
else:
self.assertEqual(len(rows), 0)