The fifth U.S. Naval Observatory CCD Astrograph
Catalog (UCAC5)
1000
2017-02-27T08:28:00Z
New astrometric reductions of the US Naval Observatory CCD Astrograph
Catalog (UCAC) all-sky observations were performed from first principles
using the TGAS stars in the 8 to 11 magnitude range as reference star
catalog. Significant improvements in the astrometric solutions were
obtained and the UCAC5 catalog of mean positions at a mean epoch near 2001
was generated. By combining UCAC5 with Gaia DR1 data new proper motions on
the Gaia coordinate system for over 107 million stars were obtained with
typical accuracies of 1 to 2 mas/yr (R = 11 to 15 mag), and about 5 mas/yr
at 16th mag. Proper motions of most TGAS stars are improved over their Gaia
data and the precision level of TGAS proper motions is extended to many
millions more, fainter stars.
The database table uses actual NULLs for missing photometry, and all
angular coordinates have been homogenised to degrees.
2017arXiv170205621Z
Zacharias, N.; Finch, C.; Frouard, J.
surveys
astrometry
proper-motions
Optical
2015-01-01 2015-01-01
0/0-11
8.277e-20 4.138e-19
Position ICRS Epoch J2015.0 "ra" "dec"
Error "ra_error" "dec_error"
Velocity "pmra" "pmde" Error "sigpmr" "sigpmd"
Position ICRS Epoch "epu" "ra_ucac" "de_ucac"
Velocity "pmra" "pmde" Error "sigpmr" "sigpmd"
shortName: UCAC 5
testQuery.ra: 208.82855
testQuery.dec: -59.70276
testQuery.sr: 0.001
cone/scs.xml
row = self.getFirstVOTableRow()
self.assertEqual(row["source_id"], '5867576683902312192')
self.assertAlmostEqual(row["rmag"], 13.449999809265137)
self.assertAlmostEqual(row["pmde"], -2.333330030523939e-06)
/tap/sync
for group in self.getXpath(
"//v:GROUP[utype='stc:CatalogEntryLocation']"):
if self.getXpath(
"v:FIELDref[utype='stc:AstroCoords.Position2D.Value2.C1']",
group)[0].get("ref")=="ra_ucac":
# UCAC position annotation, epoch is in column
self.assertEqual(
self.getXpath(
"v:FIELDref[utype='stc:AstroCoords.Position2D.Epoch']",
group)[0].get("ref"), "epu")
else:
# Gaia position annotation, epoch is a literal
self.assertEqual(
self.getXpath(
"v:PARAM[utype='stc:AstroCoords.Position2D.Epoch']",
group)[0].get("value"), "2015.0")
self.assertEqual(
self.getXpath(
"v:PARAM[utype='stc:AstroCoords.Position2D.Epoch.yearDef']",
group)[0].get("value"), "J")