An exploration of Pluto’s environment through stellar occultations

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Table 2

Occulted stars and Pluto’s system geometry.

Date	Star mag	Star position	Sub-observer Pluto latitude	Pluto’s barycenter offset
	V, K	(ICFR/J2000)	Pluto’s north pole position angle^a	relative to DE413 ephemeris
			Distance to observer

April 10, 2006	16.5, 12.9	α_s = 266.528667°	B = −38.98°	Δα·cos(δ) = −74 ± 2 mas
		δ_s = −15.769475°	P = + 68.18°	Δδ = + 16 ± 2 mas
			4.5908 × 10⁹ km

June 14, 2007	15.4, 11.6	α_s = 267.5864133°	B = −39.69°	Δα·cos(δ) = −98 ± 1 mas
		δ_s = −16.37839167°	P = + 67.08°	Δδ = + 79 ± 1 mas
			4.5318 × 10⁹ km

Notes.

^(a)

Assuming that Pluto’s north pole vector is opposite to Charon’s orbital pole (IAU convention), whose position is taken from Tholen et al. (2008): α_p = 133.0539°, δ_p = −6.1680° (ICRS/J2000).

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