Dictionary of Nomenclature of Celestial Objects
(Last update: 26-Sep-2023)

Result of query: info cati USNO-A2.0$

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
     byMONET 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
 Originof the Acronym: A = Assigned by the author(s)