Constraints On The Size Of KBO (50000) Quaoar From A Single-chord Stellar Occultation

Details Constraints On The Size Of KBO (50000) Quaoar From A Single-chord Stellar Occultation Constraints On The Size Of KBO (50000) Quaoar From A Single-chord Stellar Occultation

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822412p&link_type=abstract

American Astronomical Society, AAS Meeting #218, #224.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of the stellar occultation of the magnitude 16.2 star 26029635 UCAC2 (2MASS ID 1275509401) by (50000) Quaoar were made at MIT's George R. Wallace, Jr., Astrophysical Observatory on the night of 11 February 2011 UT (Sallum, this meeting). A single occultation chord dataset was obtained and will be analyzed to place a lower limit on the size of Quaoar based on this chord. The resulting value will be compared to Quaoar size estimates from other techniques including direct imaging with the Hubble Space Telescope (Brown 2004), and Spitzer Infrared imaging (Stansberry 2007), which give significantly differing results given their error bars (1260 ± 190 km and 844.4 +206.7/-189.6 km, respectively).
The difficulties of analyzing low-cadence and single-chord occultation data will be examined, and comparisons to other such occultation chords of this type (e.g. Elliot 2010) will be made.
This work is supported in part by grant NNX10AB27G to MIT from NASA's Planetary Astronomy Division. Student participation is supported in part by NSF's REU program, MIT's Undergraduate Research Opportunities Program, NASA's Massachusetts Space Grant, and the George R. Wallace, Jr., Astrophysical Observatory.

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