| 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 4 September 2017 ( JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.66 yr (30,190 days) |
| Aphelion | 3.4870 AU |
| Perihelion | 2.7920 AU |
| 3.1395 AU | |
| Eccentricity | 0.1107 |
| 5.56 yr (2,032 days) | |
| 126.58 ° | |
| 0° 10m 37.92s / day | |
| Inclination | 0.9409° |
| 18.979° | |
| 178.21° | |
| Physical characteristics | |
| Dimensions | 35.78±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
density | 0.95±0.27 g/cm3 [6] |
| 12 h [9] | |
| 0.0354±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] | |
| 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 ( U=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
- ^ a b c d e f g h i "JPL Small-Body Database Browser: 1669 Dagmar (1934 RS)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
- ^ a b c 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.
- ^ a b c d "LCDB Data for (1669) Dagmar". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
- ^ a b c d 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. Retrieved 17 October 2019.
- ^ a b c 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. arXiv: 1406.6645. Bibcode: 2014ApJ...791..121M. doi: 10.1088/0004-637X/791/2/121. Retrieved 23 December 2016.
- ^ a b c Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science. 73 (1): 98–118. arXiv: 1203.4336. Bibcode: 2012P&SS...73...98C. doi: 10.1016/j.pss.2012.03.009. Retrieved 23 December 2016.
- ^ a b c d 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. Bibcode: 2011PASJ...63.1117U. doi: 10.1093/pasj/63.5.1117. ( online, AcuA catalog p. 153)
- ^ a b c d 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. arXiv: 1109.6407. Bibcode: 2011ApJ...741...90M. doi: 10.1088/0004-637X/741/2/90.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1669) Dagmar". Geneva Observatory. Retrieved 23 December 2016.
- ^ 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. arXiv: 1506.00762. Bibcode: 2015Icar..261...34V. doi: 10.1016/j.icarus.2015.08.007. Retrieved 23 December 2016.
- ^ a b "1669 Dagmar (1934 RS)". Minor Planet Center. Retrieved 23 December 2016.
- ^ 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
- Asteroid Lightcurve Database (LCDB), query form ( info Archived 16 December 2017 at the Wayback Machine)
- 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 AstDyS-2, Asteroids—Dynamic Site
- 1669 Dagmar at the JPL Small-Body Database
| 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 4 September 2017 ( JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.66 yr (30,190 days) |
| Aphelion | 3.4870 AU |
| Perihelion | 2.7920 AU |
| 3.1395 AU | |
| Eccentricity | 0.1107 |
| 5.56 yr (2,032 days) | |
| 126.58 ° | |
| 0° 10m 37.92s / day | |
| Inclination | 0.9409° |
| 18.979° | |
| 178.21° | |
| Physical characteristics | |
| Dimensions | 35.78±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
density | 0.95±0.27 g/cm3 [6] |
| 12 h [9] | |
| 0.0354±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] | |
| 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 ( U=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
- ^ a b c d e f g h i "JPL Small-Body Database Browser: 1669 Dagmar (1934 RS)" (2017-05-04 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
- ^ a b c 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.
- ^ a b c d "LCDB Data for (1669) Dagmar". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
- ^ a b c d 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. Retrieved 17 October 2019.
- ^ a b c 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. arXiv: 1406.6645. Bibcode: 2014ApJ...791..121M. doi: 10.1088/0004-637X/791/2/121. Retrieved 23 December 2016.
- ^ a b c Carry, B. (December 2012). "Density of asteroids". Planetary and Space Science. 73 (1): 98–118. arXiv: 1203.4336. Bibcode: 2012P&SS...73...98C. doi: 10.1016/j.pss.2012.03.009. Retrieved 23 December 2016.
- ^ a b c d 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. Bibcode: 2011PASJ...63.1117U. doi: 10.1093/pasj/63.5.1117. ( online, AcuA catalog p. 153)
- ^ a b c d 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. arXiv: 1109.6407. Bibcode: 2011ApJ...741...90M. doi: 10.1088/0004-637X/741/2/90.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (1669) Dagmar". Geneva Observatory. Retrieved 23 December 2016.
- ^ 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. arXiv: 1506.00762. Bibcode: 2015Icar..261...34V. doi: 10.1016/j.icarus.2015.08.007. Retrieved 23 December 2016.
- ^ a b "1669 Dagmar (1934 RS)". Minor Planet Center. Retrieved 23 December 2016.
- ^ 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
- Asteroid Lightcurve Database (LCDB), query form ( info Archived 16 December 2017 at the Wayback Machine)
- 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 AstDyS-2, Asteroids—Dynamic Site
- 1669 Dagmar at the JPL Small-Body Database