astro.wikisort.org - Asteroid

Ilse (minor planet designation: 249 Ilse) is a Main belt asteroid. It has an unusually slow rotation period, about 3.5 days.

249 Ilse

3D model based on lightcurve data
Discovery
Discovered by	C. H. F. Peters
Discovery date	16 August 1885
Designations
MPC designation	(249) Ilse
Pronunciation	German: [ˈɪlzə][1]
Named after	Ilse
Alternative designations	A885 QA, 1973 PB
Minor planet category	Main belt
Orbital characteristics[2]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc	130.59 yr (47699 d)
Aphelion	2.89450 AU (433.011 Gm)
Perihelion	1.85992 AU (278.240 Gm)
Semi-major axis	2.37721 AU (355.626 Gm)
Eccentricity	0.21760
Orbital period (sidereal)	3.67 yr (1338.8 d)
Average orbital speed	19.31 km/s
Mean anomaly	223.964°
Mean motion	0° 16m 8.065s / day
Inclination	9.61979°
Longitude of ascending node	334.727°
Argument of perihelion	42.3241°
Physical characteristics
Dimensions	34.83±1.1 km
Synodic rotation period	84.94 h (3.539 d)
Geometric albedo	0.0428±0.003
Temperature	unknown
Absolute magnitude (H)	11.33

It was discovered by C. H. F. Peters on August 16, 1885, in Clinton, New York and was named after Ilse, a legendary German princess.

Due to the long rotation period, a possible asteroidal satellite of Ilse was proposed by R. P. Binzel in 1987 however no evidence of this has been found.[3]

References

External links

• The Asteroid Orbital Elements Database
• Minor Planet Discovery Circumstances
• Asteroid Lightcurve Data File
• 249 Ilse at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 249 Ilse at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (249) Ilse

(249) Ilse ist ein Asteroid des inneren Asteroiden-Hauptgürtels, der am 16. August 1885 von Christian Heinrich Friedrich Peters am Observatorium von Clinton (USA) entdeckt wurde.

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- [en] 249 Ilse

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[es] (249) Ilse

(249) Ilse es un asteroide que forma parte del cinturón de asteroides y fue descubierto por Christian Heinrich Friedrich Peters desde el observatorio Litchfield de Clinton, Estados Unidos, el 16 de agosto de 1885. Está nombrado por Ilse, un personaje legendario de las tradiciones germanas.[2]

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[ru] (249) Ильза

(249) Ильза (нем. Ilse) — типичный астероид главного пояса. Он был обнаружен 16 августа 1885 года германо-американским астрономом К. Г. Ф. Петерсом в обсерватории Клинтона, США и назван, вероятно, в честь легендарной немецкой принцессы Ильзе[en][1].

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