173 Ino
Ino (minor planet designation: 173 Ino) is a large asteroid and the parent body of the Ino family, located in the central regions of the asteroid belt, approximately 150 kilometers (93 miles) in diameter. It was discovered on 1 August 1877, by French astronomer Alphonse Borrelly at Marseille Observatory in southern France, and named after the queen Ino from Greek mythology. The dark Xk-type asteroid has a rotation period of 6.15 hours.
| Discovery | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery site | Marseille |
| Discovery date | 1 August 1877 |
| Designations | |
MPC designation | (173) Ino |
| Pronunciation | /ˈaɪnoʊ/ EYE-noh |
Named after | Ἰνώ Īnṓ (Greek mythology) |
Alternative designations | A877 PA; 1922 SB |
Minor planet category | main-belt · (middle) Ino |
| Adjectives | Inoan (/aɪˈnoʊən/ eye-NOH-ən) |
| Orbital characteristics | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 138.75 yr (50,678 d) |
| Aphelion | 3.3142 AU |
| Perihelion | 2.1708 AU |
Semi-major axis | 2.7425 AU |
| Eccentricity | 0.2085 |
Orbital period (sidereal) | 4.54 yr (1,659 d) |
Mean anomaly | 307.27° |
Mean motion | 0° 13m 1.2s / day |
| Inclination | 14.197° |
Longitude of ascending node | 148.18° |
| 228.89° | |
| Physical characteristics | |
| Dimensions | c/a = 0.76±0.06 |
Mean diameter | 145±3 km 119±27 km 125.8±1.5 km 148±42 km 154.1±3.5 km 160.6 km |
| Mass | (2.2±1.3)×1018 kg (4.79±3.11)×1018 kg |
Mean density | 1.4±0.8 g/cm3 2.23±1.47 g/cm3 |
Synodic rotation period | 5.93 h 6.1±0.2 h 6.106±0.001 h 6.1088±0.0007 h 6.11 h 6.113±0.002 h 6.11651 h 6.15 h 6.163 h |
| 0.061 (calculated) 0.059 0.06±0.02 0.0642±0.003 0.07±0.05 0.096±0.018 | |
| Tholen = C SMASS = Xk B–V = 0.705 U–B = 0.305 | |
| 7.66 7.80±0.05 7.90 | |
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