190 Ismene

190 Ismene
Discovery
Discovered by	C. H. F. Peters, 1878
Discovery date	22 September 1878
Designations
MPC designation	(190) Ismene
Pronunciation	/ɪsˈmiːniː/
Minor planet category	Main belt (Hilda)
Orbital characteristics
	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)
Semi-major axis	3.9864 AU (596.36 Gm)
Eccentricity	0.16597
Orbital period	7.96 yr (2907.2 d)
Mean anomaly	134.92°
Mean motion	0° 7m 25.788s / day
Inclination	6.1772°
Longitude of ascending node	175.48°
Argument of perihelion	271.47°
Physical characteristics
Mean radius	79.5 km ; 90 km
Rotation period	6.52 h (0.272 d)3
Geometric albedo	0.066
Spectral type	P
Absolute magnitude (H)	7.77; 7.59

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, 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
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
190 Ismene at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

[1] Noah Webster (1884) A Practical Dictionary of the English Language

[JPL-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.

[Warner2007-4] 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.

[aa302_907-5] 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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