Mid-IR Spitzer Observations Of The Active Centaur 60558 Echeclus

Details Mid-IR Spitzer Observations Of The Active Centaur 60558 Echeclus Mid-IR Spitzer Observations Of The Active Centaur 60558 Echeclus

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.4414b&link_type=abstract

American Astronomical Society, DPS meeting #38, #44.14; Bulletin of the American Astronomical Society, Vol. 38, p.566

Astronomy and Astrophysics

Astronomy

1

Scientific paper

On December 30, 2005, Choi and Weissman discovered that the formerly dormant Centaur 2000 EC98 was in strong outburst (IAUC 8656, 2006). Previous observations spanning a 3 year period indicated a lack of coma down to the 27 mag/sq. arcsec level (Rousselot et al. 2005). We present Spitzer MIPS observations of this newly active Centaur now known as 60558 Echeclus (2000 EC98) or 174P/Echeclus, taken in late February, 2006. The images show strong signal in both the 24 and 70 micron bands, and reveal an extended coma on the order of 2 arcmin in diameter. Preliminary analyses yield estimates of the coma signal contribution that are in excess of two thirds of the total signal in the 24 micron band. Simultaneous visual band observations were also made with Palomar Observatory's 200-inch telescope, and Table Mountain Observatory's 0.6m, and reveal a coma morphology nearly identical to the mid-IR observations; those results will also be discussed. This work was performed in part at the Jet Propulsion Laboratory under contract with NASA, and was supported in part by the NASA Planetary Astronomy Program.

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