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J/AJ/133/1247   Solar system survey with Spacewatch          (Larsen+, 2007)

The search for distant objects in the solar system using Spacewatch. Larsen J.A., Roe E.S., Albert C.E., Descour A.S., McMillan R.S., Gleason A.E., Jedicke R., Block M., Bressi T.H., Cochran K.C., Gehrels T., Montani J.L., Perry M.L., Read M.T., Scotti J.V., Tubbiolo A.F. <Astron. J., 133, 1247-1270 (2007)> =2007AJ....133.1247L
ADC_Keywords: Surveys ; Minor planets ; Solar system Keywords: Kuiper Belt - minor planets, asteroids - solar system: formation - surveys Abstract: We have completed a low-inclination ecliptic survey for distant and slow-moving bright objects in the outer solar system. This survey used data taken over 34 months by the University of Arizona's Spacewatch Project based at Steward Observatory, Kitt Peak. Spacewatch revisits the same sky area every three to seven nights in order to track cohorts of main-belt asteroids. This survey used a multiple-night detection scheme to extend our rate sensitivity to as low as 0.012"/hr. When combined with our plate scale and flux sensitivity (V∼21), this survey was sensitive to Mars-sized objects out to 300AU and Jupiter-sized planets out to 1200AU. The survey covered approximately 8000deg2 of raw sky, mostly within 10° of the ecliptic but away from the Galactic center. An automated motion detection program was modified for this multinight search and processed approximately 2 terabytes of imagery into motion candidates. This survey discovered 2003 MW12, currently the tenth largest classical Kuiper Belt object. In addition, several known large Kuiper Belt objects and Centaurs were detected, and the detections were used with a model of our observational biases to make population estimates as a check on our survey efficiency. We found no large objects at low inclinations despite having sufficient sensitivity in both flux and rate to see them out as far as 1200AU. For low inclinations, we can rule out more than one to two Pluto-sized objects out to 100AU and one to two Mars-sized objects to 200AU. Description: Our data were collected at the 0.9 meter Spacewatch telescope (IAU observatory code 691) at the Steward Observatory on Kitt Peak in Arizona as part of its normal near-Earth asteroid search. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 215 3930 Entries for the pointing history of the survey
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 24 A24 --- Name Processing name of region 26- 29 I4 --- Num Number of generated candidate motions at S/N=3 31- 36 F6.4 deg2 Cover Overlapped sky coverage between nights 38- 39 I2 h RAh ? Earlier night Right Ascension (J2000) 41- 42 I2 min RAm ? Earlier night Right Ascension (J2000) 44- 49 F6.3 s RAs ? Earlier night Right Ascension (J2000) 51 A1 --- DE- Earlier night Declination Sign (J2000) 52- 53 I2 deg DEd ? Earlier night Declination (J2000) 55- 56 I2 arcmin DEm ? Earlier night Declination (J2000) 58- 62 F5.2 arcsec DEs ? Earlier night Declination (J2000) 64- 73 A10 "YYYY/MM/DD" Obs.date ? UT Date of earlier night 75- 84 A10 "h:m:s" Obs.time ? Earlier UT Hour of shutter open (1) 86- 91 I6 --- Obj ?=0 Earlier night number of detected matched objects 93- 96 F4.1 arcsec FWHM Earlier night average FWHM of the stellar profile between the images 98-128 A31 --- Obser Earlier night observer identities 130-131 I2 h RA2h ? Later night Right Ascension (J2000) 133-134 I2 min RA2m ? Later night Right Ascension (J2000) 136-141 F6.3 s RA2s ? Later night Right Ascension (J2000) 143 A1 --- DE2- Later night Declination sign (J2000) 144-145 I2 deg DE2d ? Later night Declination (J2000) 147-148 I2 arcmin DE2m ? Later night Declination (J2000) 150-154 F5.2 arcsec DE2s ? Later night Declination (J2000) 156-165 A10 "YYYY/MM/DD" Obs2.date ? UT Date of later night 167-177 A11 "h:m:s" Obs2.time ? Later UT Hour of shutter open (1) 179-184 I6 --- Obj2 ?=0 Later night number of detected matched objects 186-189 F4.1 arcsec FWHM2 Later night average FWHM of the stellar profile between the images 191-215 A25 --- Obser2 Later night observer identities
Note (1): Midexposure time 60 seconds later.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 04-Feb-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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