Data Set Information
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| DATA_SET_NAME |
SHAPE AND ROTATION OF (8567) 1996 HW1 V1.0
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| DATA_SET_ID |
EAR-A-I0037-5-SHAPE8567-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Data Set Overview : We observed near-Earth Asteroid (8567) 1996 HW1 at the Arecibo Observatory on six dates in September 2008, obtaining radar images and spectra. By combining these data with an extensive set of new lightcurves taken during 2008-2009 and with previously published lightcurves from 2005, we were able to reconstruct the object's shape and spin state. 1996 HW1 is an elongated, bifurcated object with maximum diameters of 3.8 x 1.6 x 1.5 km and a contact-binary shape. It is the most bifurcated near-Earth asteroid yet studied and one of the most elongated as well. The sidereal rotation period is 8.76243 +/- 0.00004 h and the pole direction is within 5 degrees of ecliptic longitude and latitude (281, -31). Radar astrometry has reduced the orbital element uncertainties by 27% relative to the a priori orbit solution that was based on a half-century of optical data. Simple dynamical arguments are used to demonstrate that this asteroid could have originated as a binary system that tidally decayed and merged. The shape model is presented as a faceted solid in Wavefront .obj format. Also given are rendered .png images of the shape and tabulated rotation state.
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| DATA_SET_RELEASE_DATE |
2016-12-31T00:00:00.000Z
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| START_TIME |
2005-06-26T12:00:00.000Z
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| STOP_TIME |
2009-01-08T12:00:00.000Z
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| MISSION_NAME |
SUPPORT ARCHIVES
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| MISSION_START_DATE |
1965-01-01T12:00:00.000Z
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| MISSION_STOP_DATE |
2015-01-01T12:00:00.000Z
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| TARGET_NAME |
ASTEROID 8567
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| TARGET_TYPE |
ASTEROID
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| INSTRUMENT_HOST_ID |
OBS14409T1
OBS240T1
OBS352T1
OBS14411T1
OBS078T5
OBS296T1
OBS14412T1
OBS14408T1
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| INSTRUMENT_NAME |
APOGEE AP8
ARECIBO PLANETARY RADAR TRANSMITTER
SBIG ST-6
ARECIBO 2380 MHZ RADAR RECEIVER
TABLE MOUNTAIN OBSERVATORY 24-INCH CCD CAMERA
SBIG ST-8
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| INSTRUMENT_ID |
I2959
I0038
I2957
I0037
I0042
I0238
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| INSTRUMENT_TYPE |
CCD CAMERA
RADAR TRANSMITTER
RADAR RECEIVER
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| NODE_NAME |
Small Bodies
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| ARCHIVE_STATUS |
LOCALLY ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview : See table 3 of Magri et al., 2011 for formal model uncertainties. 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.
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| CITATION_DESCRIPTION |
Magri, C., Howell, E.S., Nolan, M.C., Taylor, P.A., Fernandez, Y.R, Mueller, M., Vervack, R.J., Benner, L.A.M., Giorgini, J.D., Ostro, S.J., Scheeres, D.J., Hicks, M.D., Rhoades, H., Somers, J.M., Gaftonyuk, N.M., Kouprianov, V.V., Krugly, Yu.N., Molotov, I.E., Busch, M.W., Margot, J.L., Benishek, V., Protitch-Benishek, V., Galad, A., Higgins, D., Kusnirak, P., and Pray, D.P., Shape and Rotation of (8567) 1996 HW1 V1.0. EAR-A-I0037-5-SHAPE8567-V1.0. NASA Planetary Data System, 2017.
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| ABSTRACT_TEXT |
We present the three-dimensional shape and rotation state of near-Earth asteroid (8567) 1996 HW1 based on radar images and optical lightcurves (Magri et al., 2011). 1996 HW1 was observed in 2008 using the 12.6-cm radar at Arecibo Observatory. Optical lightcurves were obtained at several observatories and used to further constrain the shape modeling.
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| PRODUCER_FULL_NAME |
MICHAEL NOLAN
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| SEARCH/ACCESS DATA |
SBN PSI WEBSITE
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