Observations of the LCROSS Impact with the Allen Telescope Array

Details Observations of the LCROSS Impact with the Allen Telescope Array Observations of the LCROSS Impact with the Allen Telescope Array

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21540307b&link_type=abstract

American Astronomical Society, AAS Meeting #215, #403.07; Bulletin of the American Astronomical Society, Vol. 42, p.224

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Scientific paper

The LCROSS impact at the lunar South Pole in the crater Cabeus (314.5E, 84.74S) was observed on October 9, 2009 with the 42-element Allen Telescope Array at Hat Creek Radio Observatory. Cabeus has permanently shadowed regions (PSRs) where water delivered by cometary and asteroid impacts in the past has been inferred (1). The ATA-42 was used to search for dissociated OH from that water in the direction of the impact plume at 1612 MHz, 1665 MHz, 1667 MHz and 1720 MHz from impact through 4 hours post-impact. A secondary goal of the observation was to determine if the explosion created by the impact flash emitted radiation at radio frequencies to help elucidate the mechanism responsible for impact flashes caused by meteoritic impacts on the lunar surface. To that end, we used one of two dual-polarization, 100 MHz-bandwidth correlators to make continuum observations at 7000 MHz. The second dual-polarization correlator with a bandwidth of 3 MHz was used to make spectral line observations of the 1665 MHz and 1667 MHz OH lines. A change in the target crater from Cabeus A1 to Cabeus rendered the impact site itself unobservable. The 1612 MHz, 1665 MHz, and 1667 MHz OH lines and 1720 MHz OH line were also simultaneously observed using two dual-polarization, 75-MHz beamformers and the high-resolution SETI signal detectors. This poster discusses the results of the LCROSS observations with the multiple, simultaneous backends of the ATA-42.
The first phase of the ATA was funded through generous grants from the
Paul G. Allen Family Foundation. UC Berkeley, the SETI Institute, the
National Science Foundation (Grant No. 0540599), Sun Microsystems,
Xilinx, Nathan Myhrvold, Greg Papadopoulos, and other corporations and
individual donors contributed additional funding.
(1) Science, Vol 325 (5948), 25 Sept. 2009

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