190 Ismene

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190 Ismene
Discovery
Discovered by C. H. F. Peters, 1878
Discovery date 22 September 1878
Designations
Main belt (Hilda)
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 121.44 yr (44357 d)
Aphelion 4.6480 AU (695.33 Gm)
Perihelion 3.3248 AU (497.38 Gm)
3.9864 AU (596.36 Gm)
Eccentricity 0.16597
7.96 yr (2907.2 d)
134.92°
0° 7m 25.788s / day
Inclination 6.1772°
175.48°
271.47°
Earth MOID 2.34759 AU (351.194 Gm)
Jupiter MOID 0.773933 AU (115.7787 Gm)
Jupiter Tisserand parameter 3.022
Physical characteristics
Mean radius
79.5 km[1]
90 km[2]
6.52 h (0.272 d)3
0.066
P
7.77[3]
7.59[1]

190 Ismene is a very large main belt asteroid. It was discovered by German-American astronomer C. H. F. Peters on September 22, 1878 in Clinton, New York and named after Ismene, the sister of Antigone in Greek mythology.

Being a P-type asteroid, it has a very dark surface. Ismene orbits near the outer edge of the asteroid belt. It is one of the largest members of the Hilda asteroid family, which are locked in 3:2 resonance with the planet Jupiter.[4]

References[edit]

  1. ^ a b c Yeomans, Donald K., "190 Ismene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016. 
  2. ^ [1]
  3. ^ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34, pp. 113–119, Bibcode:2007MPBu...34..113W. 
  4. ^ Dahlgren, M.; Lagerkvist, C.-I. (October 1995), "A study of Hilda asteroids. I. CCD spectroscopy of Hilda asteroids", Astronomy and Astrophysics, 302: 907, Bibcode:1995A&A...302..907D. 

External links[edit]