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Data Set Information
DATA_SET_NAME SHAPE MODEL OF ASTEROID (153591) 2001 SN263 V1.0
DATA_SET_ID EAR-A-I0037-5-SHAPE153591-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : We report radar observations (2380-MHz, 13-cm) by the Arecibo Observatory and optical light curves observed from eight different observatories and collected at the Ondrejov Observatory of the triple near-Earth asteroid system (153591) 2001 SN263. The radar observations were obtained over the course of ten nights spanning February 12-26, 2008 and the light curve observations were made throughout January 12 - March 31, 2008. Both data sets include observations during the object's close approach of 0.06558 AU on February 20th, 2008. The delay-Doppler images revealed the asteroid to be comprised of three components, making it the first known triple near-Earth asteroid. Only one other object, (136617) 1994 CC is a confirmed triple near-Earth asteroid. We present physical models of the three components of the asteroid system. We constrain the primary's pole direction to an ecliptic longitude and latitude of (309,-80) degrees +/- 15 degrees. We find that the primary rotates with a period 3.4256 +/- 0.0002 h and that the larger satellite has a rotation period of 13.43 +/- 0.01 h, considerably shorter than its orbital period of approximately 6 days. We find that the rotation period of the smaller satellite is consistent with a tidally locked state and therefore rotates with a period of 0.686 +/- 0.002 days (Fang et al. [2011]. Astron. J. 141, 154-168). The primary, the larger satellite, and the smaller satellite have equivalent diameters of 2.5 +/- 0.03 km, 0.77 +/- 0.12 km, and 0.43 +/- 0.14 km, and densities of 1.1 +/- 0.2 g/cm^3, 1.0 +/- 0.4 g/cm^3, and 2.3 +/- 1.3 g/cm^3, respectively. The shape models are presented as faceted solids in Wavefront .obj format. Also given are rendered .png images of the shapes and tabulated rotation states. In the rendered mages, colored regions indicate areas that were not well-viewed by the radar observations (incidence and emission angle > 60 degrees). These facets are listed in the 'unseen' tables.
DATA_SET_RELEASE_DATE 2016-12-31T00:00:00.000Z
START_TIME 2007-01-12T12:00:00.000Z
STOP_TIME 2008-03-31T12:00:00.000Z
MISSION_NAME SUPPORT ARCHIVES
MISSION_START_DATE 1965-01-01T12:00:00.000Z
MISSION_STOP_DATE 2015-01-01T12:00:00.000Z
TARGET_NAME
TARGET_TYPE
INSTRUMENT_HOST_ID OBS14409T1
OBS240T1
OBS14410T1
OBS1242T2
OBS352T1
OBS14407T1
OBS296T1
OBS102T3
OBS14408T1
INSTRUMENT_NAME APOGEE AP8
OBSERVATOIRE DE HAUTE-PROVENCE 1.2M CCD 1996-2014
PALMER DIVIDE 0.5M CCD
ARECIBO PLANETARY RADAR TRANSMITTER
SBIG ST-6
ARECIBO 2380 MHZ RADAR RECEIVER
FLI--FL-PL3041-1-BB
TABLE MOUNTAIN OBSERVATORY 24-INCH CCD CAMERA
SBIG ST-8
SBIG ST-9E
INSTRUMENT_ID I2959
I2960
I2961
I0038
I2957
I0037
I2958
I0042
I0238
I1376
INSTRUMENT_TYPE CCD CAMERA
RADAR TRANSMITTER
RADAR RECEIVER
NODE_NAME Small Bodies
ARCHIVE_STATUS LOCALLY ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : See Table 4 of Becker et al., 2015 for formal uncertainties. The shape models of beta and gamma were computed as spherical harmonic representations. The models here are faceted realizations of those shapes. The coordinate system is not precisely aligned to the center of mass and moments of inertia. In principle, offsets could be physically meaningful, but they are within the uncertainties for this model.
CITATION_DESCRIPTION Becker, T.M., Howell, E.S, Nolan, M.C., Magri, C., Pravec, P., Taylor, P.A., Oey, J., Higgins, D., Vilagi, J., Korno, L., Galad, A., Gajdo, ., Gaftonyuk, N.M., Krugly, Yu.N., Molotov, I.E., Hicks, M.D., Carbognani, A., Warner, B.D., Vachier, F., Marchis, F., and Pollock, J.T., Shape model of Asteroid (153591) 2001 SN263 V1.0. EAR-A-I0037-5-SHAPE153591-V1.0. NASA Planetary Data System, 2017.
ABSTRACT_TEXT We present the three-dimensional shapes and rotation states of the three components of near-Earth asteroid (153591) 2001 SN263 based on radar images and optical lightcurves (Becker et al., 2015. 2001 SN263 was observed in 2003 using the 12.6-cm radar at Arecibo Observatory. Optical lightcurves were obtained at several observatories and used to further constrain the shape modeling.
PRODUCER_FULL_NAME MICHAEL NOLAN
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