1689 Floris-Jan
| Discovery [1] | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 16 September 1930 |
| Designations | |
| MPC designation | 1689 Floris-Jan |
|
Named after
|
Floris-Jan van der Meulen (5,000th Visitor Contest Winner)[2] |
| 1930 SO · 1926 PG 1928 DN · 1934 VV 1943 AC · 1949 OF 1949 ON1 · 1949 OY 1951 CW · 1966 BP |
|
| main-belt · (inner) [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.66 yr (32,017 days) |
| Aphelion | 2.9523 AU |
| Perihelion | 1.9467 AU |
| 2.4495 AU | |
| Eccentricity | 0.2052 |
| 3.83 yr (1,400 days) | |
| 14.030° | |
| Inclination | 6.3808° |
| 123.31° | |
| 264.51° | |
| Physical characteristics | |
| Dimensions | 13.99±0.23 km[4] 16.122±4.950 km[5] 16.213 km[6] 13.74±1.91 km[7] 16.21 km (taken)[3] |
| 145 h[8] 144.85±0.20 h[9] 0.083 h[10] |
|
| 0.184±0.007[4] 0.1271±0.0508[5] 0.1353[6] 0.175±0.050[7] |
|
| B–V = 0.685 U–B = 0.265 S [3] |
|
| 11.82 | |
1689 Floris-Jan, provisional designation 1930 SO, is a stony asteroid and a slow rotator from the inner regions of the asteroid belt, about 16 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 16 September 1930.[11] It was independently discovered by Soviet astronomer Evgenii Skvortsov at the Crimean Simeiz Observatory five days later.[2]
The asteroid orbits the Sun at a distance of 1.9–3.0 AU once every 3 years and 10 months (1,400 days). Its orbit is tilted by 6 degrees to the plane of the ecliptic and shows a relatively high eccentricity of 0.21.[1] According to the surveys carried out by the Akari, WISE and NEOWISE missions, the geometric albedo of the S-type asteroid lies in the range of 0.13–0.18.[4][5][6][7]
Light-curve observations from the 1980s already revealed that the asteroid was a very slow rotator with a rotation period of 145 hours. At the time, the six-day period was a new record among slowly rotating asteroids ever measured.[8][9][10] It was also assumed that it might be a tumbling asteroid with a non-principal axis rotation.[3][9]
The asteroid was named after Floris-Jan van der Meulen, the 5,000th visitor to a 14-day astronomical exhibition at the Leiden Observatory.[2]
References
- ↑ 1.0 1.1 1.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 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 6.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 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 9.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 10.0 10.1 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
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 1689 Floris-Jan at the JPL Small-Body Database
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