176 Iduna
Main-belt asteroid
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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 Sällskapet Idun, a club in Stockholm that hosted an astronomical conference; Idun (Iðunn, Iduna) is also a Norse goddess.[3][4] A G-type asteroid, it has a composition similar to that of the largest main-belt asteroid, 1 Ceres.
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3D convex shape model of 176 Iduna | |
| Discovery | |
|---|---|
| Discovered by | C. H. F. Peters |
| Discovery date | 14 October 1877 |
| Designations | |
| (176) Iduna | |
| Pronunciation | /iËËduËnÉ/ |
Named after | Iðunn |
| A877 TB; 1945 RQ | |
| 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) |
| TJupiter | 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 | |
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.[5]
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