Methane, ammonia, and their irradiation products at the surface of an intermediate-size KBO? - A portrait of Plutino (90482) Orcus

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Volume 520 (September-October 2010)

A&A, 520 (2010) A40

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Table 2:

Comparison of the visible spectral slope S (in %/100 nm) as computed from linear regression using the same algorithm on published data and our work over the common spectral range (0.51-0.76 $\mu$ m).
Data reference	UT date	r(AU)^a	$\alpha (^{\circ})$ ^b	Instrument	Computed S (%/100 nm)
This paper	2005-04-09	47.67	0.99	Keck + LRIS-RB	$2.01\pm0.54$
Fornasier et al. (2009)	2008-02-04	47.81	0.48	VLT + FORS2	$1.75\pm0.57$
de Bergh et al. (2005)	2004-04-11	47.62	1.02	VLT + FORS2	$1.42\pm0.74$
Fornasier et al. (2004)	2004-02-29	47.61	0.46	TNG + DOLORES	$1.80\pm0.67$

Notes. ^(a) Heliocentric distance from JPL Horizons ephemeris. ^(b) Phase angle ( $^{\circ}$ ) from JPL Horizons ephemeris.

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