112 Iphigenia

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]

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)
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°
Argument of perihelion	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
Synodic rotation period	31.466 h (1.3111 d)[2][4]
Geometric albedo	0.0393±0.005
Temperature	~178 K
Spectral type	C
Absolute magnitude (H)	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]

References

1. Noah Webster (1884) A Practical Dictionary of the English Language
2. Yeomans, Donald K., "112 Iphigenia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
3. 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.
4. 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.
5. 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.
6. 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.

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 viewer · Orbit parameters · Physical parameters