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]
| 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 | |
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]
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b c Yeomans, Donald K., “112 Iphigenia”, JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
- ^ a b c Carry, B. (December 2012), “Density of asteroids”, Planetary and Space Science, 73 (1): 98–118, arXiv:1203.4336, Bibcode:2012P&SS…73…98C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456. See Table 1.
- ^ a b Pilcher, Frederick (June 2008), “Period Determination for 84 Klio, 98 Ianthe, 102 Miriam 112 Iphigenia, 131 Vala, and 650 Amalasuntha”, The Minor Planet Bulletin, 35 (2): 71–72, arXiv:1203.4336, Bibcode:2008MPBu…35…71P, doi:10.1016/j.pss.2012.03.009, S2CID 119226456.
- ^ Tietjen, F. (May 1871), “Elemente der (112) Iphigenia. Aus einem Schreiben des Herrn Dr. F. Tietjen an den Herausgeber”, Astronomische Nachrichten, 77: 297, Bibcode:1871AN…..77..297T, doi:10.1002/asna.18710771903.
- ^ Cikota, Stefan; Cikota, Aleksandar (July 2010), “Lightcurve Photometry of 112 Iphigenia”, The Minor Planet Bulletin, 37 (3): 107, arXiv:1203.4336, Bibcode:2010MPBu…37Q.107C, doi:10.1016/j.pss.2012.03.009, S2CID 119226456.
- 112 Iphigenia at AstDyS-2, Asteroids—Dynamic Site
- 112 Iphigenia at the JPL Small-Body Database
