Table 3
Information for Lutetia orientation.
| Sidereal period PS | 8.168 270 ± 0.000 001 h |
|
|
|
| IAU system† | |
| EQJ2000 (α0, δ0) | (52°, +12°) ± 5° |
| Reference epoch‡ | JD 2451545.00000 |
| UT 2000 Jan. 1.50 | |
| PM Angle W0 | 94° ± 2° |
|
|
|
| Inversion-technique System† | |
| ECJ2000 (λ0, β0) | (52°, –6°) ± 5° |
| Reference epoch t0 | JD 2444822.35116 |
| UT 1981 Aug. 5.85 | |
| PM Angle φ0 | 0° ± 2° |
Notes.
To orient the shape model in space at any time, a pole position, the spin period, and the observation time are required. In addition, the position of the prime meridian (PM) at some reference time must be specified, using either of two systems. Using the IAU convention (see Seidelmann et al. 2007), the value W0, related to the PM position, is given at the fixed reference time J2000.0. Alternatively, in the convention typically used with inversion techniques (e.g., see Eq. (1) in Kaasalainen et al. 2001; Durech et al. 2010) a reference epoch t0 is specified, at which time the PM-position parameter, φ0, attains the specified value (often zero).
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