1669 Dagmar

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 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)
Jupiter Tisserand parameter 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

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1669 Dagmar (1934 RS)" (2015-07-21 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1669) Dagmar. Springer Berlin Heidelberg. p. 133. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 "LCDB Data for (1669) Dagmar". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 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 November 2015.
    5. 1 2 3 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 November 2015.
    6. 1 2 3 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 November 2015.
    7. 1 2 3 4 Carry, B. (December 2012), "Density of asteroids", Planetary and Space Science 73, pp. 98–118, arXiv:1203.4336, Bibcode:2012P&SS...73...98C, doi:10.1016/j.pss.2012.03.009
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1669) Dagmar". Geneva Observatory. Retrieved November 2015.
    9. ↑ "1669 Dagmar (1934 RS)". Minor Planet Center. Retrieved November 2015.

    External links


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