163 Erigone
163 Erigone is an asteroid from the asteroid belt and the namesake of the Erigone family of asteroids that share similar orbital elements and properties. It was discovered by French astronomer Henri Joseph Perrotin on April 26, 1876, and named after one of the two Erigones in Greek mythology. This asteroid is orbiting the Sun at a distance of 2.37 AU with a period of 3.643 years and an eccentricity (ovalness) of 0.19. The orbital plane is inclined at an angle of 4.8° to the plane of the ecliptic.
3D convex shape model of 163 Erigone | |
| Discovery | |
|---|---|
| Discovered by | J. Perrotin |
| Discovery site | Toulouse |
| Discovery date | 26 April 1876 |
| Designations | |
MPC designation | (163) Erigone |
| Pronunciation | /ɪˈrɪɡəniː/ |
Named after | Erigone |
Alternative designations | A876 HC; 1892 RA; 1957 OT; 2017 YH23 |
Minor planet category | Main belt (Erigone) |
| Adjectives | Erigonian /ɛrɪˈɡoʊniən/ Erigonean /ɛrɪɡəˈniːən/ |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 123.56 yr (45131 d) |
| Aphelion | 2.8188 AU (421.69 Gm) |
| Perihelion | 1.9161 AU (286.64 Gm) |
Semi-major axis | 2.3675 AU (354.17 Gm) |
| Eccentricity | 0.19064 |
Orbital period (sidereal) | 3.64 yr (1330.5 d) |
Mean anomaly | 280.031° |
Mean motion | 0° 16m 14.052s / day |
| Inclination | 4.8148° |
Longitude of ascending node | 160.166° |
| 298.260° | |
| Earth MOID | 0.93686 AU (140.152 Gm) |
| Jupiter MOID | 2.3628 AU (353.47 Gm) |
| TJupiter | 3.518 |
| Physical characteristics | |
| Dimensions | 72.63±5.7 km 72.70 ± 1.95 km |
| Mass | (2.01 ± 0.68) × 1018 kg |
Mean density | 9.99 ± 3.45 g/cm3 |
Synodic rotation period | 16.136 h (0.6723 d) |
| 0.0546±0.010 0.0428 ± 0.0092 | |
| C (Tholen) | |
| 9.47, 9.48 | |
Photometric measurements taken in 2014 were used to construct a lightcurve that demonstrated a rotation period of 16.136±0.001 h with an amplitude of 0.32±0.02 in magnitude. Erigone is a relatively large and dark asteroid with an estimated size of 73 km. Based upon its spectrum, it is classified as a C-type asteroid, which indicates that it probably has a carbonaceous composition. It is the largest member of the eponymously named Erigone collisional family.