Imaging and spectroscopy of comet C/2001 Q4 (NEAT) at 8.6 AU from the Sun

Details Imaging and spectroscopy of comet C/2001 Q4 (NEAT) at 8.6 AU from the Sun Imaging and spectroscopy of comet C/2001 Q4 (NEAT) at 8.6 AU from the Sun

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...398l..41t&link_type=abstract

Astronomy and Astrophysics, v.398, p.L41-L44 (2003)

Astronomy and Astrophysics

Astrophysics

8

Comets, C/2001 Q4 (Neat), Distant Activity

Scientific paper

Comet C/2001 Q4 (NEAT) was observed inbound at an heliocentric distance of 8.6 AU. Broadband filter images in the visible and long slit spectroscopy in the 3500-7000 Å range was recorded. No sign of CN emission was detected and an upper limit for CN production rate of 1.4*E25 molecules s-1 is estimated. The color of the dust in the inner coma is very red with a spectral index of 29%/1000 Å. The radial profile of the dust coma displays steep gradients of 1.7 (inner part) to 2.4 (outer part). The afrho value, a proxy for the dust production, is measured to be 1500 cm. The coma shows a weak and short conic structure in the northern hemisphere that is interpreted as dust fan produced by an active region on the nuclear surface.
Based on observations collected at the European Southern Observatory, Chile.

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