Astronomy:1669 Dagmar

From HandWiki
Short description: Rare-type Themistian asteroid
1669 Dagmar
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date7 September 1934
Designations
(1669) Dagmar
Named afterGeneric name
(common German name)[2]
1934 RS · 1943 GE
1950 PX · 1953 AD
1957 WA · 1959 CV
1962 RH
Minor planet categorymain-belt · Themis[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc82.66 yr (30,190 days)
|{{{apsis}}}|helion}}3.4870 AU
|{{{apsis}}}|helion}}2.7920 AU
3.1395 AU
Eccentricity0.1107
Orbital period5.56 yr (2,032 days)
Mean anomaly126.58°
Mean motion0° 10m 37.92s / day
Inclination0.9409°
Longitude of ascending node18.979°
178.21°
Physical characteristics
Dimensions35.78±2.4 km (IRAS:17)[4]
42.377±0.188 km[5]
42.99±2.86 km[6]
43.00±0.77 km[7]
45.194±0.620 km[8]
Mass(3.98±0.80)×1016 kg[6]
Mean density0.95±0.27 g/cm3[6]
Rotation period12 h[9]
Geometric albedo0.0354±0.0061[8]
0.039±0.007[5][7]
0.0565±0.008 (IRAS:17)[4]
Tholen = G:[1] · G:[3]
B–V = 0.730[1]
U–B = 0.460[1]
Absolute magnitude (H)10.91±0.18[10] · 10.97 (IRAS:17)[1][3][4] · 10.97[7][8]


1669 Dagmar, provisional designation 1934 RS, is a rare-type Themistian asteroid from the outer region of the asteroid belt, approximately 42 kilometers in diameter. It was discovered on 7 September 1934, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany, and named after a common German feminine name.[2][11]

Classification and orbit

The asteroid is a member of the Themis family, a large group of asteroids in the outer main-belt. It orbits the Sun at a distance of 2.8–3.5 AU once every 5 years and 7 months (2,032 days). Its orbit has an eccentricity of 0.11 and an inclination of 1° with respect to the ecliptic.[1] As no precoveries were taken, and no prior identifications were made, Dagmar's observation arc begins with its official discovery observation.[11]

Physical characteristics

Dagmar has a rare spectra of a G-type asteroid (or Cg-type in the SMASS taxonomy), similar to 1 Ceres, the largest asteroid and only dwarf planet in the asteroid belt.[1]

Rotation period

Astronomer Federico Manzini obtained a provisional lightcurve of Dagmar from photometric observations in March 2004. It gave a tentative rotation period of 12 hours with a brightness variation of 0.15 magnitude ({{{1}}}).[9] As of 2017, no secure period has yet been published.[1]

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Dagmar measures between 35.78 and 45.194 kilometers in diameter, and its surface has an albedo between 0.035 and 0.057.[4][5][7][8] The Collaborative Asteroid Lightcurve Link adopts the results obtained by 17 observations made by IRAS, that is an albedo of 0.0565 and a diameter of 35.78 kilometers with an absolute magnitude of 10.97.[3]

Naming

This minor planet was named by the discoverer after a common German feminine name. No special meaning is assigned to this name.[2] The official naming citation was published by the Minor Planet Center on 15 December 1968 (M.P.C. 2901).[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "JPL Small-Body Database Browser: 1669 Dagmar (1934 RS)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001669. Retrieved 6 June 2017. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1669) Dagmar". Dictionary of Minor Planet Names – (1669) Dagmar. Springer Berlin Heidelberg. p. 133. doi:10.1007/978-3-540-29925-7_1670. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 "LCDB Data for (1669) Dagmar". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1669%7CDagmar. Retrieved 23 December 2016. 
  4. ↑ 4.0 4.1 4.2 4.3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 17 October 2019. 
  5. ↑ 5.0 5.1 5.2 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R. et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal 791 (2): 11. doi:10.1088/0004-637X/791/2/121. Bibcode: 2014ApJ...791..121M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M. Retrieved 23 December 2016. 
  6. ↑ 6.0 6.1 6.2 Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science 73 (1): 98–118. doi:10.1016/j.pss.2012.03.009. Bibcode: 2012P&SS...73...98C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012P&SS...73...98C. Retrieved 23 December 2016. 
  7. ↑ 7.0 7.1 7.2 7.3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  8. ↑ 8.0 8.1 8.2 8.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  9. ↑ 9.0 9.1 Behrend, Raoul. "Asteroids and comets rotation curves – (1669) Dagmar". Geneva Observatory. http://obswww.unige.ch/~behrend/page4cou.html#001669. Retrieved 23 December 2016. 
  10. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 23 December 2016. 
  11. ↑ 11.0 11.1 "1669 Dagmar (1934 RS)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1669. Retrieved 23 December 2016. 
  12. ↑ Schmadel, Lutz D.. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. 

External links



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:1669_Dagmar&oldid=3350952"