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19 April 2024 |
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A New Analysis of Spitzer Observations of Comet 29P/Schwassmann-Wachmann 1 | | Charles A. Schambeau
; Yanga R. Fernandez
; Carey M. Lisse
; Nalin Samarasinha
; Laura M. Woodney
; | | Date: |
23 Jun 2015 | | Abstract: | We present a new analysis of ${it Spitzer}$ observations of comet
29P/Schwassmann-Wachmann 1 taken on UT 2003 November 21, 23, and 24, similar to
a previous investigation of the observations (Stansberry et al. 2004), but
using the most recent ${it Spitzer}$ data pipeline products and intensive
image processing techniques. Analysis of images from the IRAC 5.8 & 8.0 $mu$m
bands and the MIPS 24.0 & 70.0 $mu$m bands resulted in photometry measurements
of the nucleus after a suite of coma modeling and removal processes were
implemented. SW1 was not identified in the 5.8 $mu$m image from the previous
work so its incorporation into this analysis is entirely new. Using the Near
Earth Asteroid Thermal Model (Harris 1998) resulted in a nucleus radius
measurement of $R$ = 30.2 $^{+3.7}_{-2.9}$ km and an infrared beaming parameter
value of $eta = 0.99$ $^{+0.26}_{-0.19}$. We also measured an infrared
geometric albedo, $p_{5.8}$ = 0.5 $pm$ 0.5. Extrapolating a 0.04 V-band albedo
and using a normalized reflectivity gradient $S’ = 14.94 pm 1.09$ [% (1000
{A})$^{-1}$] (Duffard et al. 2014) we recover an infrared albedo of $p_{5.8}$
= 0.31 in the near infrared consistent with the value recovered from thermal
modeling. The dust composition extracted from IRS spectra are very comet-like,
containing mainly amorphous ferromagnesian silicates (but with a minority of
crystalline silicates as well), water ice, and metal sulfides. | | Source: | arXiv, 1506.7037 | | Services: | Forum | Review | PDF | Favorites | |
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