190 Ismene
Orbital diagram
Discovery
Discovered byC. H. F. Peters, 1878
Discovery date22 September 1878
Designations
(190) Ismene
Pronunciation/ɪsˈmiːniː/[1]
Named after
Ismene
A878 SA; 1947 QJ;
1951 DB
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]

    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.

    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. 1 2 3 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, vol. 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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