Table 2
Astrometry and Ks magnitudes of Neptune’s inner satellites.
| Ref. frame | Mean motion | r | L | 2.2 μm | |
| (deg day-1) | (× 103 km) | (deg) | magnitude | ||
|
|
|||||
| Larissa | K2a | 649.05408 ± 0.00009 | 72.60 ± 0.80 | 75.52 ± 0.64 | 20.4 ± 0.2 |
| Galatea | K2a | 839.66123 ± 0.00008 | 61.80 ± 0.62 | 20.73 ± 0.58 | 20.9 ± 0.3 |
| Despina | K2a | 1075.73297 ± 0.00013 | 51.82 ± 0.81 | 68.05 ± 0.89 | 21.0 ± 0.3 |
| Thalassa | K2b | 1155.75861 ± 0.00015 | 50.48 ± 0.87 | 358.33 ± 0.90 | 23.1 ± 0.6 |
Notes. The orbital radius r and longitude L (with origin at the J2000 ascending node) are measured in the equatorial plane of Neptune at the time of the reference frames K1, K2a, or K2b (cf. Table 1). The reference longitudes used to derive the mean motions are the values of Owen (1991) at epoch JD 2 447 757.0 = 1989 August 18, 12h at Neptune. Aperture photometry was used to measure the satellite magnitudes. The Ks zero-magnitude point (m0 = 22.98 and 23.15 on August 30 and 31, respectively) was calibrated using a reference star (HD 204778, mK = 9.37).
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