112 Iphigenia
Iphigenia (minor planet designation: 112 Iphigenia) is a fairly large and exceedingly dark main-belt asteroid. It is classified as a C-type asteroid, and therefore probably has a primitive carbonaceous composition. It was discovered by German-American astronomer C. H. F. Peters on September 19, 1870, and named after Iphigenia, a princess sacrificed by her father in Greek mythology. The orbital elements for 112 Iphigenia were published by German astronomer Friedrich Tietjen in 1871.
3D convex shape model of 112 Iphigenia | |
| Discovery | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | 19 September 1870 |
| Designations | |
MPC designation | (112) Iphigenia |
| Pronunciation | /ˌɪfɪdʒɪˈnaɪə/ |
Named after | Iphigenia |
Alternative designations | A870 SA |
Minor planet category | Main belt |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 145.57 yr (53169 d) |
| Aphelion | 2.7461 AU (410.81 Gm) |
| Perihelion | 2.12225 AU (317.484 Gm) |
Semi-major axis | 2.43415 AU (364.144 Gm) |
| Eccentricity | 0.12813 |
Orbital period (sidereal) | 3.80 yr (1387.1 d) |
Average orbital speed | 19.01 km/s |
Mean anomaly | 169.984° |
Mean motion | 0° 15m 34.308s / day |
| Inclination | 2.6029° |
Longitude of ascending node | 323.538° |
| 16.676° | |
| Earth MOID | 1.11284 AU (166.478 Gm) |
| Jupiter MOID | 2.60275 AU (389.366 Gm) |
| TJupiter | 3.493 |
| Physical characteristics | |
| Dimensions | 72.18±4.4 km 71.07 ± 0.52 km |
| Mass | (1.97 ± 6.78) × 1018 kg |
Mean density | 10.48 ± 36.06 g/cm3 |
Equatorial surface gravity | 0.0202 m/s² |
Equatorial escape velocity | 0.0382 km/s |
Synodic rotation period | 31.466 h (1.3111 d) |
| 0.0393±0.005 | |
| Temperature | ~178 K |
| C | |
| 9.84 | |
This body is orbiting the Sun with a period of 3.80 years and an eccentricity of 0.13. The orbital plane is inclined by 2.6° to the plane of the ecliptic. 112 Iphigenia has a cross-section diameter of ~72 km. Photometric observations of this asteroid during 2007 at the Observatorio Astronómico de Mallorca were used to create a light curve plot, which was published in 2010. This showed a relatively long synodic rotation period of 31.385±0.006 hours (1.3 days) and a brightness variation of 0.30±0.02 magnitude during each cycle. These findings agree with independent results reported in 2008, which gave a period of 31.466±0.001 hours.