- S/2001 (87) 1 was discovered by Brown et al.,(IAUc, 7588) in Feb. 2001
- The Orbit model presented here is based on 24 positions taken with the VLT-NACO in service observing between Aug. and Oct. 2004
Orbital Elements of S/2001 (87) 1
| Orbital Properties | Sylvia & S/2001 (87) 1 |
| Semi-major axis (a) | 1356 +/- 5 km |
| Inclination (i) | 1.7 +/-1 deg in w.r.t primary |
| Eccentricity (e) | 0.001 +/- 0.001 |
| Period (P) | 3.6496 +/- 0.0007 days |
| Mass Mk | 1.48E19 kg |
| Density (rho) | 1.2 +/- 0.1 g/cm3 |
| Nominal Porosity | 60% |
| J2 | 0.17 +/- 0.1 |
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Pole Solution (72.4 +/- 0.5, 62.6 +/- 0.5) in ecliptic J2000
- The density is calculated considering an ellipsoid shape for Sylvia's primary a= 192 km, b= 132 km and c= 116 km
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Prograde orbit w.r.t to the spin of the primary
- size of the moonlet D=18 +/- 4 km
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Fig 1: Orbit of 87 Sylvia's satellite.
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Fig 2: Crosses indicate the positions of Sylvia's satellite measured on the data (using a Moffat-Gauss profile). The dots are the predicted positions of the orbit model. RMS = 10 mas |