153 Hilda
Hilda (minor planet designation: 153 Hilda) is a large asteroid in the outer main belt, with a diameter of 170 km. The spectrum matches that of a P-type asteroid. It was discovered by Johann Palisa on 2 November 1875, from the Austrian Naval Observatory at Pula, now Croatia. The name was chosen by the astronomer Theodor von Oppolzer, who named it after one of his daughters.
Star field showing Hilda (apmag 14.2) | |
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Austrian Naval Obs. |
| Discovery date | 2 November 1875 |
| Designations | |
MPC designation | (153) Hilda |
| Pronunciation | /ˈhɪldə/ |
Alternative designations | A875 VC; 1935 GD |
Minor planet category | Main belt (Hilda) |
| Adjectives | Hildian /ˈhɪldiən/ |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 121.05 yr (44215 d) |
| Aphelion | 4.5341 AU (678.29 Gm) |
| Perihelion | 3.4225 AU (512.00 Gm) |
Semi-major axis | 3.9783 AU (595.15 Gm) |
| Eccentricity | 0.13971 |
Orbital period (sidereal) | 7.935 yr (2,898.3 d) 7.94 yr (2898.3 d) |
Mean anomaly | 51.690° |
Mean motion | 0° 7m 27.156s / day |
| Inclination | 7.8249° |
Longitude of ascending node | 228.16° |
| 38.617° | |
| Jupiter MOID | 0.569657 AU (85.2195 Gm) |
| TJupiter | 3.023 |
| Physical characteristics | |
| Dimensions | 170.63±3.3 km |
| Mass | ~5.2×1018 kg |
Equatorial escape velocity | ~ 6 m/s |
Synodic rotation period | 5.9587 h (0.24828 d) |
| 0.0618±0.002 | |
| P | |
| 7.48 | |
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