1669 Dagmar
| Discovery [1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 7 September 1934 |
| Designations | |
| 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 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.52 yr (29777 days) |
| Aphelion | 3.4868 AU (521.62 Gm) |
| Perihelion | 2.7905 AU (417.45 Gm) |
| 3.1387 AU (469.54 Gm) | |
| Eccentricity | 0.11092 |
| 5.56 yr (2031.1 d) | |
| 20.412° | |
| 0° 10m 38.1s / day | |
| Inclination | 0.94103° |
| 18.973° | |
| 178.02° | |
| Earth MOID | 1.78861 AU (267.572 Gm) |
| Jupiter MOID | 1.47235 AU (220.260 Gm) |
| TJupiter | 3.201 |
| Physical characteristics | |
| Dimensions | 35.78 km[4] 43.00±0.77 km[5] 45.194±0.620 km[6] 42.99±2.86 km[7] |
Mean radius | 17.89 ± 1.2 km |
| Mass | (3.98±0.80)×1016 kg[7] |
Mean density | 0.95±0.27 g/cm3[7] |
| 12 h (0.50 d)[1][8] | |
| 0.0565[4] 0.039±0.002[5] 0.0354±0.0061[6] 0.0565 ± 0.008[1] | |
| B–V = 0.730 U–B = 0.460 Tholen = G G [3] Cg[7] | |
| 10.97 | |
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
- ^ a b c d "JPL Small-Body Database Browser: 1669 Dagmar (1934 RS)" (2015-07-21 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
- ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1669) Dagmar. Springer Berlin Heidelberg. p. 133. ISBN 978-3-540-29925-7. Retrieved 12 November 2015.
- ^ a b "LCDB Data for (1669) Dagmar". Asteroid Lightcurve Database (LCDB). Retrieved 12 November 2015.
- ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 12 November 2015.
- ^ a b c Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 12 November 2015.
- ^ a b c Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 12 November 2015.
- ^ a b c d Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science, vol. 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1669) Dagmar". Geneva Observatory. Retrieved 12 November 2015.
- ^ "1669 Dagmar (1934 RS)". Minor Planet Center. Retrieved 12 November 2015.
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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