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 7:

Comparison of orbital and physical properties of some intermediate-large size water-bearing objects of interest.
Parameter	Orcus	Charon	(208996) 2003 AZ₈₄	Quaoar	Haumea
Dynamical Class^a	3:2	3:2	3:2	Classical	Classical
Orbit inclination ( $^{\circ}$ )^b	20.6	17.1	13.6	8.0	28.2
Semi-major axis (AU)^c	39.2	39.6	39.4	43.5	43.0
q (AU)^d	30.2	29.7	32.3	41.7	34.5
Q (AU)^e	48.1	49.6	46.5	45.2	51.5
r (AU)^f	47	31	45	43	51
Diameter (km)	$946\pm70^{(1)}$	$1207\pm3^{(2)}$	$686\pm95^{(1)}$	$850\pm200^{(1)}$	$1150\pm200^{(1)}$
	$940\pm70^{(3)}$			$910\pm100^{(6)}$	$\sim$ $2000\times1500\times1000^{(5)}$
				$1260\pm190^{(4)}$
p_V (%)^g	$19.7\pm3^{(1)}$	$\sim$ 40⁽⁷⁾	$12.3\pm4^{(1)}$	$19.9\pm10^{(1)}$	$80\pm15^{(1)}$
	$28\pm4^{(3)}$			$17.2\pm5^{(6)}$	60-80⁽⁸⁾
				$9.2\pm4^{(4)}$
Vis. slope (%/100 nm)^h	$\sim$ 2	-	$\sim$ 3	$\sim$ 28	$\sim$ 0
Dominant ice at surface	H₂O (cryst)	H₂O (cryst)	H₂O (cryst)	H₂O (cryst)	H₂O (cryst)
Volatiles and other	NH₄⁺+C₂H₆	NH₄⁺+CH₄+NH₃:H₂O⁽⁹⁾	CH₃OH ?⁽¹⁰⁾	CH₄+C₂H₆⁽¹¹⁾	-
	NH₃:H₂O+CH₄	NH₃:H₂O, NH₃⁽¹³⁾		CH₄+C₂H₆+N₂⁽¹²⁾
	NH₃+CH₄	NH₄OH⁽¹³⁾

Notes. ^(a) Using classification by Gladman et al. (2008). ^(b) With respect to ecliptic plane, from the Minor Planet Center. ^(c) From the Minor Planet Center. ^(d) Perihelion from the Minor Planet Center. ^(e) Aphelion from the Minor Planet Center. ^(f) Approximate current heliocentric distance. ^(g) Visible geometric albedo. ^(h) Slope of the visible spectrum from Fornasier et al. (2009) and references therein, except for Orcus: this paper.

References. (1) Stansberry et al. (2008), (2) Sicardy et al. (2006) and references therein, (3) Brown et al. (2010), (4) Brown & Trujillo (2004), (5) Brown (2008), (6) Brucker et al. (2009), (7) computed from Buie et al. (2010), (8) Rabinowitz et al. (2006), (9) Cook et al. (2009), (10) Guilbert et al. (2009), (11) Schaller & Brown (2007a), (12) Dalle Ore et al. (2009), (13) Merlin et al. (2010a) and references therein.

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