190 Ismene
 Orbital diagram | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters, 1878 |
| Discovery date | 22 September 1878 |
| Designations | |
| 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 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 | |
| 79.5 km [2] 90 km [3] | |
| Mass | (5.23±0.82)×1018 kg[4][a] |
Mean density | 2.49 g/cm3[4][b] |
| 6.52 h (0.272 d)3[link removed] | |
| 0.066 | |
| P | |
| 7.77[5] 7.59[2] | |
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.[6]
Notes
[edit]- ↑ Calculated from its standard gravitational parameter GM = 0.349±0.055 km3/s2.
- ↑ Assuming a diameter of 159 km.
References
[edit]- ↑ Noah Webster (1884) A Practical Dictionary of the English Language
- 1 2 3 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.
- 1 2 Fuentes-Muñoz, Oscar; Farnocchia, Davide; Giorgini, Jon D.; Park, Ryan S. (1 December 2025). "Asteroid Mass Estimation by Mutual Perturbations During Close Encounters After Gaia Focused Product Release". The Astronomical Journal. 170 (6): 353. Bibcode:2025AJ....170..353F. doi:10.3847/1538-3881/ae0cc9. ISSN 0004-6256. S2CID 283347135.
- ↑ Warner, Brian D. (December 2007), "Initial Results of a Dedicated H-G Project", The Minor Planet Bulletin, 34 (4): 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
[edit]- 190 Ismene at AstDyS-2, Asteroids—Dynamic Site
- 190 Ismene at the JPL Small-Body Database
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