1704 Wachmann
Main-belt asteroid
From Wikipedia, the free encyclopedia
1704 Wachmann, provisional designation A924 EE, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 March 1924. It was later named after astronomer Arno Wachmann.[2][8]
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Light curve based 3D-model of Wachmann | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 March 1924 |
| Designations | |
| (1704) Wachmann | |
Named after | Arno Wachmann (German astronomer)[2] |
| A924 EE · 1947 CE 1957 BJ | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.16 yr (34,026 days) |
| Aphelion | 2.4163 AU |
| Perihelion | 2.0292 AU |
| 2.2228 AU | |
| Eccentricity | 0.0871 |
| 3.31 yr (1,210 days) | |
| 67.047° | |
| 0° 17m 50.64s / day | |
| Inclination | 0.9715° |
| 259.47° | |
| 280.77° | |
| Physical characteristics | |
| Dimensions | 6.618±0.070[4] 6.934±0.070 km[5] 7.82 km (calculated)[3] |
| 3.314±0.001 h[6] | |
| 0.1767±0.0133[5] 0.193±0.036[4] 0.20 (assumed)[3] | |
| S[3] | |
| 12.9[1][3] · 12.97±0.13[7] · 13.3[5] | |
Classification and orbit
The S-type asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,210 days). Its orbit has an eccentricity of 0.09 and an inclination of 1° with respect to the ecliptic.[1] No precoveries were taken. The asteroid's observation arc begins 3 days after its official discovery observation.[8]
Physical characteristics
Lightcurves
In April 2007, a rotational lightcurve Wachmann was obtained at the U.S. Sandia View Observatory in New Mexico (H03). Lightcurve analysis gave a well-defined rotation period of 3.314±0.001 hours with a brightness variation of 0.40 magnitude (U=3).[6]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Wachmann measures 6.6 and 6.9 kilometers in diameter, and its surface has an albedo of 0.177 and 0.193, respectively,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 7.8 kilometers, based on an absolute magnitude of 12.9.[3]
Naming
This minor planet was named for Arno Wachmann (1902–1990), long-time astronomer at the Bergedorf Observatory in Hamburg, discoverer of minor planets and comets, and observer of variable and binary stars. He is best known for the co-discovery of the three "Schwassmann–Wachmann" comets, 29P, 31P and 73P.[2] The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3933).[9]
