1845 Helewalda
| Discovery [1] | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 30 October 1972 |
| Designations | |
| MPC designation | 1845 Helewalda |
|
Named after
|
Helen from Wald, Zürich (school sweetheart)[2] |
| 1972 UC · 1931 VC1 1954 GG · 1971 OR 1971 QX2 |
|
| main-belt · (outer) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 83.61 yr (30,540 days) |
| Aphelion | 3.1399 AU |
| Perihelion | 2.8014 AU |
| 2.9707 AU | |
| Eccentricity | 0.0569 |
| 5.12 yr (1,870 days) | |
| 54.988° | |
| Inclination | 10.720° |
| 142.61° | |
| 326.11° | |
| Physical characteristics | |
| Dimensions | 20.426±0.147 km[4] 32.03 km (calculated)[3] |
| 7.2786 h[5] 7.399±0.004 h[6] 7.4±0.1 h[7] 7.3985±0.0098 h[8] |
|
| 0.1289±0.0185[4] 0.057 (assumed)[3] |
|
| C [3] | |
| 11.2 | |
1845 Helewalda, provisional designation 1972 UC, is a carbonaceous asteroid in the outer regions of the asteroid belt. It orbits the Sun at a distance of 2.8–3.1 AU once every 5.12 years (1,870 days).[3] The asteroid was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern on 30 October 1972.[9]
Helewalda has a well-determined rotation period of 7.4 hours with several photometric measurements taken or evaluated between 2009 and 2015.[5][6][7][8]
The Light Curve Data Base project calculated the body's diameter to be about 32 kilometers, based on an assumed albedo of 0.057 for a C-type asteroid, while measurements from the NEOWISE mission detected it to be much more reflective and therefore only 20 kilometers in diameter.[3][4]
The discoverer named a pair of asteroids after two of his former schoolmates, Susi and Helen, both from the small village of Wald, Zürich in Switzerland. This one was dedicated to Helen, while the previously numbered asteroid 1844 Susilva was given to Susi.[2]
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- 1845 Helewalda at the JPL Small-Body Database
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