Global Information173 Ino information
 | |
| Discovery[1] | |
|---|---|
| Discovered by | A. Borrelly |
| Discovery site | Marseille |
| Discovery date | 1 August 1877 |
| Designations | |
MPC designation | (173) Ino |
| Pronunciation | /ˈaɪnoʊ/ EYE-noh[2] |
Named after | Ἰνώ Īnṓ[3] (Greek mythology) |
Alternative designations | A877 PA; 1922 SB |
Minor planet category | main-belt[1][4] · (middle) Ino[5] |
| Adjectives | Inoan (/aɪˈnoʊən/ eye-NOH-ən)[6] |
| Orbital characteristics[4] | |
| 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° |
Argument of perihelion | 228.89° |
| Physical characteristics | |
| Dimensions | c/a = 0.76±0.06[7] |
Mean diameter | 145±3 km[7] 119±27 km[8] 125.8±1.5 km[9] 148±42 km[10] 154.1±3.5 km[11] 160.6 km[12] |
| Mass | (2.2±1.3)×1018 kg[7] (4.79±3.11)×1018 kg[13] |
Mean density | 1.4±0.8 g/cm3[7] 2.23±1.47 g/cm3[13] |
Synodic rotation period | 5.93 h[14] 6.1±0.2 h[15] 6.106±0.001 h[15] 6.1088±0.0007 h[15] 6.11 h[16] 6.113±0.002 h[17] 6.11651 h[18] 6.15 h[19] 6.163 h[20] |
Geometric albedo | 0.061 (calculated)[7] 0.059[12] 0.06±0.02[10] 0.0642±0.003[11] 0.07±0.05[8] 0.096±0.018[9] |
Spectral type | Tholen = C[4] SMASS = Xk[4] B–V = 0.705[4] U–B = 0.305[4] |
Absolute magnitude (H) | 7.66[4][9][10][11][12][21] 7.80±0.05[22] 7.90[8][23] |
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.[1][3] The dark Xk-type asteroid has a rotation period of 6.15 hours.[21]
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