176 Iduna

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176 Iduna
Discovery
Discovered by C. H. F. Peters
Discovery date 14 October 1877
Designations
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 138.50 yr (50587 d)
Aphelion 3.7235 AU (557.03 Gm)
Perihelion 2.6526 AU (396.82 Gm)
3.1880 AU (476.92 Gm)
Eccentricity 0.16796
5.69 yr (2079.1 d)
165.15°
0° 10m 23.34s / day
Inclination 22.660°
200.50°
188.17°
Earth MOID 1.65682 AU (247.857 Gm)
Jupiter MOID 1.73015 AU (258.827 Gm)
Jupiter Tisserand parameter 3.056
Physical characteristics
Dimensions 121.04±2.2 km
11.2877 h (0.47032 d)[1]
11.289 hours[2]
0.0834±0.003
G
8.2

176 Iduna is a large main-belt asteroid that was discovered by German-American astronomer Christian Heinrich Friedrich Peters on October 14, 1877, in Clinton, New York. It is named after the Ydun, a club in Stockholm that hosted an astronomical conference. A G-type asteroid, it has a composition similar to that of the largest main-belt asteroid, 1 Ceres.

An occultation of a star by Iduna was observed from Mexico on January 17, 1998.

Photometric observations of this asteroid at the Romer Observatory in Aarhus, Denmark during 1996 gave a light curve with a period of 11.289 ± 0.006 hours and a brightness variation of 0.35 in magnitude.[2] A 2008 study at the Palmer Divide Observatory in Colorado Springs, Colorado gave a period of 11.309 ± 0.005 hours, confirming the 1996 result.[3]

References[edit]

  1. ^ a b Yeomans, Donald K., "176 Iduna", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016. 
  2. ^ a b Hansen, A. T.; Arentoft, T. (June 1997), "The Rotational Period of 176 Iduna", The Minor Planet Bulletin, 24, p. 14, Bibcode:1997MPBu...24Q..14H. 
  3. ^ Warner, Brian D. (June 2008), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June - October 2007", The Minor Planet Bulletin, 35 (2), pp. 56–60, Bibcode:2008MPBu...35...56W. 

External links[edit]