Spectral observations in the 2.5-12 μm range of comet 103P/Hartley 2 were performed on 1 Jan. 1998 by the ISOPHOT instrument, on board the Infrared Space Observatory. The obtained spectrum evidences intense bands at 2.66 and 4.26 μm, attributable to H 2O and CO 2, respectively. The derived molecular production rates are Q(H 2O) = (3.1 ± 0.2) × 10 28 molec. s -1 and Q(CO 2) = (2.5 ± 0.3) × 10 27 molec. s -1. This leads to a CO 2/H 2O abundance ratio of ∼ 8%, showing that P/Hartley 2 is a relatively CO 2 abundant comet, with respect to IP/Halley and several other comets. A feature has been detected at 3.69 μm, whose attribution is rather puzzling. The long wavelength part of the spectrum is well fitted by a black-body profile at 285 K colour temperature. No significant silicate emission feature around 10 μm is observed, within observation errors.

Infrared spectral observations of comet 103P/Hartley 2 by ISOPHOT

COLANGELI, Luigi;EPIFANI, Elena;BUSSOLETTI, Ezio;FULLE, Marco;MENNELLA, Vito;PALUMBO, Pasquale;ROTUNDI, Alessandra
1999

Abstract

Spectral observations in the 2.5-12 μm range of comet 103P/Hartley 2 were performed on 1 Jan. 1998 by the ISOPHOT instrument, on board the Infrared Space Observatory. The obtained spectrum evidences intense bands at 2.66 and 4.26 μm, attributable to H 2O and CO 2, respectively. The derived molecular production rates are Q(H 2O) = (3.1 ± 0.2) × 10 28 molec. s -1 and Q(CO 2) = (2.5 ± 0.3) × 10 27 molec. s -1. This leads to a CO 2/H 2O abundance ratio of ∼ 8%, showing that P/Hartley 2 is a relatively CO 2 abundant comet, with respect to IP/Halley and several other comets. A feature has been detected at 3.69 μm, whose attribution is rather puzzling. The long wavelength part of the spectrum is well fitted by a black-body profile at 285 K colour temperature. No significant silicate emission feature around 10 μm is observed, within observation errors.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11367/63163
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 50
  • ???jsp.display-item.citation.isi??? 49
social impact