Details on Acronym: USNO-A2.0 | |
USNO-A2.0 | (US Naval Obs., A2.0 catalogue) |
Write: | <<USNO-A2.0 NNNN-NNNNNNNN>> |
N: | 526280881 |
Object: | * (SIMBAD class: Star) |
Note: | USNO-A2.0 is based on a re-reduction of the Precision Measuring Machine (PMM) scans from POSS-I O and E plates (≥-18deg) and SRC-J and ESO-R plates (≤-20deg). The major difference between USNO-A2.0 and its previous version USNO-A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). The USNO-A2.0 number is made of a zone number (4 digits from 0000 to 1725 representing the distance in 0.1deg to the South Pole) and a number in the area (8 digits); a dash - must separate the two parts. Note that this number differs from the USNO-A1.0 number. |
Ref: | =1998USNO2.C......0M |
by | MONET D. , et al. |
The PMM USNO-A2.0 Catalog., 0-None (1998) | |
A catalogue of astrometric standards. | |
o | <USNO-A2.0 NNNN-NNNNNNNN> N=526280881. |
=E= | Catalogue in electronic form as I/252 |
Origin | of the Acronym: A = Assigned by the author(s) |