190 Ismene
Discovery | |
---|---|
Discovered by | C. H. F. Peters, 1878 |
Discovery date | 22 September 1878 |
Designations | |
MPC designation | (190) Ismene |
Pronunciation | /ɪsˈmiːniː/[1] |
Minor planet category | Main belt (Hilda) |
Orbital characteristics[2] | |
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° | |
Physical characteristics | |
Mean radius | 79.5 km [2] 90 km [3] |
Synodic rotation period | 6.52 h (0.272 d)3 |
0.066 | |
P | |
Absolute magnitude (H) | 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[]
- ^ Noah Webster (1884) A Practical Dictionary of the English Language
- ^ a b c Yeomans, Donald K., "190 Ismene", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 6 May 2016.
- ^ "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.
- ^ 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.
- ^ 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[]
- 190 Ismene at AstDyS-2, Asteroids—Dynamic Site
- 190 Ismene at the JPL Small-Body Database
Categories:
- Minor planet object articles (numbered)
- Hilda asteroids
- Discoveries by Christian Peters
- Minor planets named from Greek mythology
- Named minor planets
- P-type asteroids (Tholen)
- X-type asteroids (SMASS)
- Astronomical objects discovered in 1878
- Main-belt-asteroid stubs