Download - From UCAC to URAT
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from UCAC to URATYale, 2008 Sep 20 1
From UCAC to URAT
Norbert Zacharias
U.S. Naval ObservatoryAstrometry Department
Cataloging Division
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from UCAC to URATYale, 2008 Sep 20 2
acknowledgement UCAC (CCD setup, survey):
T.Rafferty, M. Germain, J.Pohlman, ...
all observers & site support (O.Saa, D.Castillo ... T.Tilleman)
M.Zacharias, C.Finch, G.Wycoff, ....
UCAC (proper motions): S.Urban, W. van Altena, T.Girard, A.Klemola, D.Monet, ...
U-mouse (detector): STA (R.Bredthauer, ...), G.Luppino ...
U-mouse (astrograph): USNO instrument shop (G.Wieder, ...)
USNO management (R.Gaume, K.Johnston ...)
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from UCAC to URATYale, 2008 Sep 20 3
U S N OC C DA s t r o g r a p hC a t a l o g
“red lens” astrograph + 4k CCD
combined with
early epoch photographic data
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from UCAC to URATYale, 2008 Sep 20 4
UCAC observing
1997 – 2004 (all-sky completed) 579 – 642 nm bandpass R = 8 to 16 mag positions accurate to 20 mas (10 – 14 mag) incl. proper motions (various early catalogs)
thanks Bill ! SPM = major contributor
most accurate astrometry for fainter than Hip.
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from UCAC to URATYale, 2008 Sep 20 5
modify dome at CTIO
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observing at CTIO
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backend of astrograph
4k camera
x-y slide
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UCAC products
UCAC1 (2000) : part of Southern Hemisphere UCAC2 (2003) : -90 to +50 deg decl. UCAC3 (2009) :
all-sky coverage; re-processing all pixel data
much improved completeness (bright stars, doubles)
improved astrometry (empirical profile fits, global iterations)
improved proper motions bright: new data: AGK2
improved proper motions faint: re-reduct. NPM, SPM
improved photometry (1 band)
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re-processing pixel data
4.5 TB compressed dark, flat handling double star fits empirical profiles identify overexposed multi-level results, flags keep “fit crash”
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StarScan plate measuring
early epoch data for proper motions, bright stars
CCD camera, step-stare mode accurate to <= 0.5 micrometer absolute
Zacharias et al. 2008, PASP
1930 AGK2: 1,900 plates 1976..1995 ZA: 2,300 plates 1983..1990 BB: 900 plates
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StarScan plate measure machine
Washington, DC
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SPM astrograph in Argentina
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KPNO 2.1 m
extragalactic reference frame link
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UCAC3 public release status
reductions completed: pixel re-processing --> x,y data, various models
“plate adjustment”, systematic errors (model, FDP, CTE)
StarScan data up to RA, Dec; SPM: final model decisions
levels of products, options for release:1) mean position catalog (80 million stars, all sky) include only if >=
2 detections + PM available
2) extract and identify minor planets -> separate catalog
3) identify double stars -> flags in main catalog
4) individual epoch RA, Dec of all detections
5) pixel data images (very noisy, dark current ...)
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U S N OR o b o t i cA s t r o m e t r i cT e l e s c o p e
4-shooter camera
plus
new 0.85m telescope
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URAT overview
USNO Robotic Astrometric Telescope
0.85 m aperture, focal length = 3.6 m 4.5 degree diameter field of view large format detector (world largest CCD)
2 px / FWHM at 1.0 arcsec seeing 9 micrometer pixel size 4 CCDs, each 95 mm on a side
60 s / 240 s integration 13 to 21 mag goal 5 mas for 'well exposed stars'
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URAT optical design
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URAT cut side view
EOST, 2005
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URATFASA2(EOST 2005)
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0.9 m primary mirror delivered, Feb.08
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status of URAT project
telescope: optical design studies completed primary mirror: delivered Feb. 2008 no funding to complete new telescope
detector: 10.5k by 10.5k CCD chip produced successfully thinning of 2 science grade chips May/July 2007 10k camera complete, 1st light October 2007 4-shooter camera funded, delivery March 2009
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“U-mouse”
(if you can't get the “rat”,how about a “mouse”?)
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10k camera dewar
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astrographwith 10k camera
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URAT phase 1 = U-mouse
currently no funding for new telescope
take 4-shooter camera, put at astrograph
complete re-make of astrograph 2007/08
move to CTIO or NOFS, begin new survey 2009
28 sq. deg. per exposure!
11 mas per image coord. (well exposed star)
multiple sky overlaps per year, 7 - 18 mag
clocked anti-blooming: seems to work!
solve for positions, motions + parallax
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STA1600B 4-shooter camera headconcept – front view
• Cryostat window –
350mm diameter,
300mm clear
aperture.
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4-shooter camera dewar
assembly
G.Luppino
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U-mouse project numbers
sky area per hemisphere 25,000 sq.deg field size per exposure 25 sq.deg number of fields 1000 2 exposures / field / epoch 60, 240 sec time for 1 field (exp.pair) 6 min time for 1-fold sky overlap 100 hour avail. observ. time / year 2,200 hour (CTIO) ...dark time, good seeing 1,500 hour (CTIO) numb. sky overlaps in 2 years 30 at CTIO numb. sky overlaps in 2 years 15 at NOFS single measure precision 11 mas(cent.+atm)...for well exposed stars R= 11..15; 40 mas R=17end of operation random error 2 mas at CTIO end of operation random error 3 mas at NOFS
systematic errors < 10 mas --> ???
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rebuilding astrograph in 24in dome
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astrograph new tube assembly
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USNO instrument shop Sep 2008astrograph tube assembly
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fully funct. 10k chip
image16
outputs
STA2008
Sep 17
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summary
UCAC3: all-sky to 16th mag, catalog in 2009 URAT -> Umouse: first light 2009
111 million pixel CCD detector on sky tested in 2007 use re-furbished astrograph for phase 1, 2008 get 4-shooter camera by March 2009 observe 2-3 years per site (NOFS, CTIO) catalog of positions, proper motions, parallaxes 2012
?