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Table 3

Orbital and optical data for Sedna and 2010 EK139 at the time of the Herschel observations.

Object Quantity Value

Sedna r 87.43 AU
Δ 87.56 AU
α 0.°7
H V  +1.83 ± 0.05

2010 EK139 r 39.08 AU
Δ 39.50 AU
α 1.°3
H V  +3.80 ± 0.10

Notes. The parameters r and Δ denote the heliocentric distance and the distance from Herschel, α is the phase angle, and HV is the absolute visual magnitude, which is available from the literature.

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