Astrometric Catalogs: Untangling the Acronym Jungle

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Presentation transcript:

Astrometric Catalogs: Untangling the Acronym Jungle Sean E. Urban U.S. Naval Observatory U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

FK5 – Old Standard Number of stars: 4652 Mag. Range: 0 to 9 (sparse beyond 6) Accuracies (2000) Pos = 100 mas; P.M = 2 mas/yr Transit circle data – long epoch span Obsolete by Hipparcos U.S. Naval Observatory

Obsolete FK5-based Catalogs IRS – International Reference Stars ACRS – Astrographic Cat. Reference Stars PMM – Positions and Proper Motions SAO – All incarnations U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

Hipparcos – New Standard Number of stars: 118,000 Accuracies (2000) Positions: 10 mas Proper motions: 1-2 mas HIP satellite observations Not obsolete More detailed talk following U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

ACT Reference Catalog Number of stars: 998,758 Mag. Range: 4th to 11th Accuracies (2000) Pos = 40 mas; P.M. = 3 mas/yr Tycho (on HIP) and AC Obsolete by Tycho-2 U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

Tycho-2 Number of stars: 2.54 million Mag. Range 0 to 12th Accuracies (2000) Pos = 40 mas; P.M. = 1 to 3 mas/yr Tycho + TC + Astrographs + AC Not obsolete More detailed talk following U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

UCAC1 Preliminary release March 2000 Southern hemisphere coverage only Mag. Range 8th to 16th Accuracies (2000) Pos. 20 to 70 mas; P.M. 2 to 12 mas/yr Observing continuing More detailed talk on this project follows U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

Guide Star Catalog 1.2 Number of stars: 19 million Mag. Range 6 to 15th Accuracies 500 mas? Single epoch only, no proper motions Recommend using USNO A2.0 U.S. Naval Observatory

Major Astrometric Catalogs U.S. Naval Observatory

USNO A2.0 Number of stars: 526 million Mag. range: 10 to 20? Accuracies 250 mas? Single epoch only, no proper motions To be replaced with B series More detailed talk following U.S. Naval Observatory

Summary Use Hipparcos, if possible Tycho-2 next UCAC1 can be used in south A2 if requiring very faint or very dense stars FK5, IRS, ACRS, PMM, ACT, and GSC are not recommended U.S. Naval Observatory

Recommended Catalogs U.S. Naval Observatory