112 Iphigenia

Short description: Main-belt asteroid

112 Iphigenia

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/[1]
Named after| Iphigenia

Alternative designations

| A870 SA
Minor planet category| Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc| 145.57 yr (53169 d)
|{{{apsis}}}|helion}}| 2.7461 astronomical unit|AU (410.81 Gm)
|{{{apsis}}}|helion}}| 2.12225 AU (317.484 Gm)

Semi-major axis

| 2.43415 AU (364.144 Gm)
Eccentricity| 0.12813
Orbital period| 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°

|{{{apsis}}}|helion}}

| 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
Rotation period| 31.466 h (1.3111 d)[2][4]
Geometric albedo| 0.0393±0.005
Physics| ~178 K

Spectral type

| C
Absolute magnitude (H)| 9.84

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 Germany 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]

## References

1. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
2. ↑ 2.0 2.1 2.2 Yeomans, Donald K., "112 Iphigenia", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=112, retrieved 12 May 2016.
3. ↑ 3.0 3.1 3.2 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73 (1): 98–118, doi:10.1016/j.pss.2012.03.009, Bibcode: 2012P&SS...73...98C. See Table 1.
4. ↑ 4.0 4.1 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, doi:10.1016/j.pss.2012.03.009, Bibcode: 2008MPBu...35...71P.
5. ↑ Tietjen, F. (May 1871), "Elemente der (112) Iphigenia. Aus einem Schreiben des Herrn Dr. F. Tietjen an den Herausgeber", Astronomische Nachrichten 77: 297, doi:10.1002/asna.18710771903, Bibcode: 1871AN.....77..297T, https://zenodo.org/record/1424681.
6. ↑ Cikota, Stefan; Cikota, Aleksandar (July 2010), "Lightcurve Photometry of 112 Iphigenia", The Minor Planet Bulletin 37 (3): 107, doi:10.1016/j.pss.2012.03.009, Bibcode: 2010MPBu...37Q.107C.

## External links

* 112 Iphigenia at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 112 Iphigenia at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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