2430 Bruce Helin
| Discovery [1] | |
|---|---|
| Discovered by | E. F. Helin E. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 8 November 1977 |
| Designations | |
| MPC designation | 2430 Bruce Helin |
|
Named after
|
Bruce Helin (son of discoverer)[2] |
| 1977 VC · 1976 JU1 A908 WC |
|
| main-belt · Phocaea [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 39.00 yr (14,245 days) |
| Aphelion | 2.8689 AU |
| Perihelion | 1.8578 AU |
| 2.3634 AU | |
| Eccentricity | 0.2138 |
| 3.63 yr (1,327 days) | |
| 164.76° | |
| Inclination | 23.446° |
| 45.881° | |
| 309.80° | |
| Physical characteristics | |
| Dimensions | 11.83±0.17 km[4] 12.47±0.32 km[5] 12.10 km (calculated)[3] |
| 128 h[lower-alpha 1] 129.75 h[6] 129.4163±0.3970 h[7] |
|
| 0.175±0.006[4] 0.238±0.032[5] 0.23 (assumed)[3] |
|
| B–V = 0.815 U–B = 0.415 S (Tholen) Sl (SMASS)[1] S [3] |
|
| 11.8[1] | |
2430 Bruce Helin, provisional designation 1977 VC, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 12 kilometers in diameter. It was discovered by American astronomers Eleanor Helin and Eugene Shoemaker at the U.S. Palomar Observatory in California, on 8 November 1977.[8]
The S-type asteroid, classified as a Sl-subtype in the SMASS taxonomy, is a member of the Phocaea family. It orbits the Sun at a distance of 1.9–2.9 AU once every 3 years and 8 months (1,327 days). Its orbit shows an eccentricity of 0.21 and is notably tilted by 23 degrees to the plane of the ecliptic.
In 2006, a first photometric light-curve analysis gave a very long period of 128 hours for the asteroid's rotation around its own axis.[lower-alpha 1] Later observations refined its rotation period to 129.4 and 129.8 hours, respectively.[6][7] According to the surveys carried out by the Japanese Akari satellite and the U.S. Wide-field Infrared Survey Explorer with its NEOWISE mission, the asteroid's surface has an albedo of 0.18 and 0.24, respectively.[4][5]
The minor planet was named after the son of the discovering astronomer, Bruce Helin, in an expression of gratitude for the many years he tolerated his mother's preoccupation with extraterrestrial objects.[2] The discoverer also honoured her daughter-in-law and Bruce's wife, Nancy Coker Helin, by the minor planet 4222 Nancita.[9]
References
- ↑ 1.0 1.1 Pravec (2006) web: rotation period 128 hours with a brightness amplitude of 0.6 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (2430) Bruce Helin
- ↑ 1.0 1.1 1.2 1.3 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 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 5.2 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.
- ↑ 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
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 2430 Bruce Helin at the JPL Small-Body Database
<templatestyles src="Asbox/styles.css"></templatestyles>
_mathilde.jpg){kind=small} |
This article about an asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it. |
