1777 Gehrels
| Discovery [1] | |
|---|---|
| Discovered by | Palomar–Leiden survey C. J. van Houten, I. van Houten-Groeneveld and Tom Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 24 September 1960 |
| Designations | |
| MPC designation | 1777 Gehrels |
|
Named after
|
Tom Gehrels (astronomer)[2] |
| 4007 P–L · 1937 GN 1941 BU · 1951 QB 1958 DA · A905 UE A923 AA |
|
| main-belt · (middle) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.91 yr (40,145 days) |
| Aphelion | 2.6723 AU |
| Perihelion | 2.5810 AU |
| 2.6266 AU | |
| Eccentricity | 0.0173 |
| 4.26 yr (1,555 days) | |
| 213.44° | |
| Inclination | 3.1478° |
| 334.69° | |
| 129.99° | |
| Physical characteristics | |
| Dimensions | 12.486±0.228 km[4] 12.667 km[5] 13.14±1.25 km[6] 12.67 km (taken)[3] |
| 2.83552 h[7] 2.840±0.004 h[8] 2.8358±0.0001 h[9] 2.837±0.002 h[7] 2.83±0.05 h[7] 2.8356±0.0002 h[lower-alpha 1] 2.8356±0.0001 h[lower-alpha 1] |
|
| 0.2212±0.0170[4] 0.2151[5] 0.277±0.274[6] |
|
| SMASS = Sq S [3] |
|
| 11.6 | |
1777 Gehrels, also designated 4007 P–L, is an asteroid from the middle region of the asteroid belt, about 13 kilometers in diameter. It was discovered during the Palomar–Leiden survey by the Dutch astronomer couple Ingrid and Cornelis van Houten, in collaboration with Dutch–American astronomer Tom Gehrels at Palomar Observatory, California, on 24 September 1960.[10]
The stony asteroid is classified as a transitional Sq-type in the SMASS classification taxonomy. It orbits the Sun at a distance of 2.6–2.7 AU once every 4 years and 3 months (1,555 days). Its orbit shows an eccentricity of 0.02 and is tilted by 3 degrees to the plane of the ecliptic. It has an albedo of around 0.22 to 0.28.[5][6] and rotates every 2.8 hours around its axis.[7][8][9][lower-alpha 1]
The designation P–L stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory. The trio are credited with several thousand asteroid discoveries.
The minor planet was named in honor of Dutch-born American astronomer Tom Gehrels (1925–2011), professor at the University of Arizona, staff member of the LPL research center at Tucson, a principal investigator in the Pioneer program, receiver of the Masursky Award, initiator of the Spacewatch project, and co-discoverer of thousands of minor planets in the Palomar–Leiden survey (see above). He was a pioneer in the field of photometric and polarimetric observations of Solar System bodies in the 1950s.[2][11]
References
- ↑ 1.0 1.1 1.2 Pravec (2005) web: rotation period 2.8356±0.0002 hours with a brightness amplitude of 0.23 mag. Pravec (1990) web:rotation period 2.8356±0.0001 hours with a brightness amplitude of 0.21 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1777) Gehrels
- ↑ 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 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 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 6.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 7.3 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.
- ↑ 9.0 9.1 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
- 1777 Gehrels at the JPL Small-Body Database
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