A spectroscopic analysis of Jupiter-coupled object (52872) Okyrhoe, and TNOs (90482) Orcus and (73480) 2002 PN34

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Table 5:

Characteristics of Orcus models including volatiles.
Model	Reduced $\chi ^2$ ^a	Depth (%)^b
Model 2	72	-
2% CO₂	73	5
5% CO₂	74	11
10% CO₂	76	21
2% CH₄	72	2
5% CH₄	73	5
10% CH₄	80	10

Notes. ^(a) The $\chi ^2$ is weighted to give greater importance to locations where absorption bands exist (H₂O bands) and lower importance to regions affected by telluric absorption. The value compares the model to the near-infrared data from Barucci et al. (2008). ^(b) The percentage depth of the strongest CO₂ band at 2.012 $\mu$ m and the CH₄ band at $\sim$ 2.2 $\mu$ m relative to the continuum for each model.

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