1669 Dagmar
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 September 1934 |
| Designations | |
| MPC designation | 1669 Dagmar |
|
Named after
|
Generic name (common German name)[2] |
| 1934 RS · 1943 GE 1950 PX · 1953 AD 1957 WA · 1959 CV 1962 RH |
|
| main-belt · Themis [3] | |
| Orbital characteristics [1] | |
| Epoch 27 June 2015 (JD 2457200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 80.87 yr (29,537 days) |
| Aphelion | 3.4898 AU |
| Perihelion | 2.7905 AU |
| 3.1402 AU | |
| Eccentricity | 0.1113 |
| 5.56 yr (2,033 days) | |
| 344.98° | |
| Inclination | 0.9411° |
| 18.972° | |
| 178.01° | |
| Physical characteristics | |
| Dimensions | 35.78 km[4] 43.00±0.77 km[5] 45.194±0.620 km[6] 42.99±2.86[7] km |
| Mass | (3.98±0.80)×1016 kg[7] |
|
Mean density
|
0.95±0.27 g/cm3[7] |
| 12 h[8] | |
| 0.0565[4] 0.039±0.002[5] 0.0354±0.0061[6] |
|
| B–V = 0.730 U–B = 0.460 Tholen = G G [3] Cg[7] |
|
| 10.97 | |
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1669 Dagmar, provisional designation 1934 RS, is a dark asteroid from the outer region of the asteroid belt, about 43 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at Heidelberg Observatory on 7 September 1934.[9]
The asteroid is a member of the Themis family, a large group of asteroids in the outer main-belt. It has a notable G-type spectra (or Cg-type in the SMASS taxonomy), similar to 1 Ceres, the largest asteroid and only dwarf planet in the asteroid belt. Dagmar orbits the Sun at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,033 days). Its orbit shows an eccentricity of 0.11 and is nearly coplanar with the plane of the ecliptic, inclined by only 1 degree. It has a provisional rotation period of 12 hours, as measured by Italian astronomer Federico Manzini at th SAS observatory in Novara.[8] Based on the surveys carried out by IRAS, Akari, WISE/NEOWISE, its albedo lies between 0.03 and 0.06.[4][5][6]
The asteroid was named by the discoverer after a common German feminine name. No special meaning is assigned to this name.[2]
References
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<references />, or <references group="..." />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
- 1669 Dagmar at the JPL Small-Body Database
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