UCAC U.S. Naval Observatory CCD Astrograph Catalog T.J. Rafferty

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Presentation transcript:

UCAC U.S. Naval Observatory CCD Astrograph Catalog T.J. Rafferty

UCAC Instrumentation Telescope Focal length 2057mm Plate scale 100”/mm Bandpass 550-710nm CCD: Chip size 4094 x 4094 pixels Pixel Size 9.0 microns Pixel scale 0.905”/pixel Field of view 61 x 61 arcmin Bandpass 579-642nm

UCAC Observing Preliminary reductions Tycho-2 Global adjustment Hipparcos 2-fold overlap each star on two fields Two exposures per field: 25 second exp 8.0th -14.5th mag 125 second exp 10.0th -16.0th mag 200 second exp 10.5th -16.5th mag (ICRF sources) Observing rate 200 frames (100 fields) per night

UCAC Accuracy Magnitude Accuracy 8th 40 mas 9th 30 mas 10th – 14th 20 mas 15th 40 mas 16th 70 mas

UCAC Proper Motions Mag Source Catalogs Errors 8.0th -11.0th 140 TC/PC, AC 1-2 mas/yr 11.0th -12.5th AC, AGK2 2 mas/yr 12.5th -16.0th NPM, SPM 3-5 mas/yr

Catalog Density (stars/sq deg) Catalog Average Max Min UCAC 1,700 55,000 300 Hipparcos 3 14 0 Tycho-2 60 350 6

UCAC Milestones Feb 1998: started observations from Chile Mar 2000: UCAC1 released

UCAC1 27 million star positions with proper motions Sky coverage: -90 to -6 degrees declination Magnitude range: 8th to 16th Positions on ICRS Epoch: 1999.0 Proper motions using Tycho-2 & USNO A2.0 Available on CD-ROM

UCAC Milestones Feb 1998: started observations from Chile Mar 2000: UCAC1 released Sep 2000: southern hemisphere completed May 2001: end observations from Chile Jun 2001: start observations from Flagstaff 2003: northern hemisphere completed 2004: final catalog released

UCAC Information Astronomical Journal paper: Zacharias et al., vol 120, pp 2131-2147, October 2000 USNO web site: http://ad.usno.navy.mil/ucac/