Data Set Information
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DATA_SET_NAME |
SHAPE MODEL OF ASTEROID (153591) 2001
SN263 V1.0
|
DATA_SET_ID |
EAR-A-I0037-5-SHAPE153591-V1.0
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NSSDC_DATA_SET_ID |
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DATA_SET_TERSE_DESCRIPTION |
Radar shape model of Asteroid (153591)
2001 SN263
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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
CCD CAMERA
CCD CAMERA
RADAR TRANSMITTER
CCD CAMERA
RADAR RECEIVER
CCD CAMERA
CCD CAMERA
CCD CAMERA
CCD CAMERA
|
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.
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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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SEARCH/ACCESS DATA |
SBN PSI WEBSITE
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