176 Iduna
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | October 14, 1877 |
| Designations | |
| Main belt | |
| Orbital characteristics[1] | |
| Aphelion | 3.714 AU |
| Perihelion | 2.679 AU |
| 3.196 AU | |
| Eccentricity | 0.162 |
| 5.71 years | |
| Inclination | 22.54° |
| Physical characteristics | |
| Dimensions | 121 km |
| 11.289[2] hours | |
| Albedo | 0.083 |
|
Spectral type
|
G |
| 7.90 | |
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
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