Comet 168P/Hergenrother
October 9.945, 2012 observation
C9 telescope (D = 0.235 m)
LISA
Spectrograph at R = 750 (35 microns slit)
Atik 460EX+ CCD camera (binning
2x2)
Castanet-Tolosan Observatory (France)
Exposure : 5 x 600 s
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Image of comet given by LISA guiding camera. Right, during acquisition phase.
2D
composite spectrum (before flat-field correction, coloration is artificial)
Observed
spectrum.
Ratio
of comet spectrum and HD134411 star spectrum (G2V star, solar equivalent objet). The ratio elliminate Sun signature. Note the flat aspect of dust reflectance
spectrum.
The comet is gaz free object for the date. Ultraviolet
CN line is prominent. [OI] lines are also detect.
David Schleicher, Lowell Observatory, reports from
narrowband photometry on Oct. 9 (see IAU Electronic Telegram No 3257)
that the comet is
strongly carbon-chain depleted
(cf. A'Hearn et al. 1995, Icarus 118, 223), by
even more than that of comet 21P/Giacobini-Zinner, the proto-type of this
class.
Download observed spectrum:
_168p_hergenrother_flat_20121009_945_cbuil.fit
Download ratio spectrum:
_168p_hergenrother_flat_20121009_945_2_cbuil.fit