Discovery | |
---|---|
Discovered by | Christian Heinrich Friedrich Peters |
Discovery date | 19 September 1870 |
Designations | |
(112) Iphigenia | |
Pronunciation | /ˌɪfɪdʒɪˈnaɪə/ [1] |
Named after | Iphigenia |
A870 SA | |
Main belt | |
Orbital characteristics [2] | |
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) |
2.43415 AU (364.144 Gm) | |
Eccentricity | 0.12813 |
3.80 yr (1387.1 d) | |
Average
orbital speed | 19.01 km/s |
169.984 ° | |
0° 15m 34.308s / day | |
Inclination | 2.6029° |
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
[2] 71.07 ± 0.52 km [3] |
Mass | (1.97 ± 6.78) × 1018 kg [3] |
Mean
density | 10.48 ± 36.06 g/cm3 [3] |
Equatorial
surface gravity | 0.0202 m/s² |
Equatorial
escape velocity | 0.0382 km/s |
31.466 h (1.3111 d) [2] [4] | |
0.0393±0.005 | |
Temperature | ~178 K |
C | |
9.84 | |
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. [5]
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. [6] These findings agree with independent results reported in 2008, which gave a period of 31.466±0.001 hours. [4]