190 Ismene

Ismene (minor planet designation: 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.

190 Ismene
Discovery
Discovered byC. H. F. Peters, 1878
Discovery date22 September 1878
Designations
(190) Ismene
Pronunciation/ɪsˈmiːniː/[1]
Main belt (Hilda)
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc121.44 yr (44357 d)
Aphelion4.6480 AU (695.33 Gm)
Perihelion3.3248 AU (497.38 Gm)
3.9864 AU (596.36 Gm)
Eccentricity0.16597
7.96 yr (2907.2 d)
134.92°
0° 7m 25.788s / day
Inclination6.1772°
175.48°
271.47°
Physical characteristics
Mean radius
79.5 km [2]
90 km [3]
6.52 h (0.272 d)3
0.066
P
7.77[4]
7.59[2]

    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.[5]

    References
    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. Yeomans, Donald K., "190 Ismene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
    3. "IOTA/IOTA-ES occultation update for (190) Ismene / TYC 0790-00635-1 event on 2014 Jan 18, 19:57 UT". Archived from the original on 14 July 2014. Retrieved 11 June 2014.
    4. 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.
    5. 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.


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