1746 Brouwer (prov. designation: 1963 RF) is a Hilda asteroid from the outermost region of the asteroid belt, approximately 64 kilometers in diameter. It was discovered on 14 September 1963, by IU's Indiana Asteroid Program at Goethe Link Observatory near Brooklyn, Indiana, United States.[10] It was named after astronomer Dirk Brouwer.[2]
Shape model of Brouwer from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 14 September 1963 |
| Designations | |
| (1746) Brouwer | |
Named after | Dirk Brouwer (astronomer)[2] |
| 1963 RF · 1940 WE 1947 QA | |
| main-belt · Hilda[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 76.33 yr (27,878 days) |
| Aphelion | 4.7671 AU |
| Perihelion | 3.1284 AU |
| 3.9478 AU | |
| Eccentricity | 0.2076 |
| 7.84 yr (2,865 days) | |
| 292.05° | |
| 0° 7m 32.52s / day | |
| Inclination | 8.3676° |
| 321.96° | |
| 47.580° | |
| Jupiter MOID | 0.8580 AU |
| TJupiter | 3.0040 |
| Physical characteristics | |
| Dimensions | 61.50±1.80 km[4] 62.523±0.492[5] 64.25±4.9 km (IRAS:2)[3][6] |
| 19.7255±0.0005 h[7] 19.8 h[8] 19.88±0.05 h[a] | |
| 0.0448±0.008 (IRAS:2)[3][6] 0.048±0.006[5] 0.051±0.003[4] | |
| Tholen = D[1] · D[3][5] B–V = 0.721[1] U–B = 0.227[1] | |
| 9.78±0.30[9] · 9.95 (IRAS:2)[6] · 9.95[3][4] | |
Classification and orbit
editBrouwer is a member of the Hilda family (001), an asteroid family within the dynamical Hilda group, a large group that orbits in resonance with the gas giant Jupiter and are thought to originate from the Kuiper belt. Brouwer orbits the Sun at a distance of 3.1–4.8 AU once every 7 years and 10 months (2,865 days). Its orbit has an eccentricity of 0.21 and an inclination of 8° with respect to the ecliptic.[1]
It was first identified as 1940 WE at Turku Observatory in 1940, extending the body's observation arc by 23 years prior to its official discovery observation.[10]
Physical characteristics
editIn the Tholen classification, Brouwer is characterized as a dark and reddish D-type asteroid.[1]
Rotation period
editSeveral rotational lightcurves of Brouwer gave a rotation period between 19.72 and 19.88 hours with a brightness variation of 0.21 and 0.35 magnitude (U=n.a/2/n.a.).[7][8][a]
Diameter and albedo
editAccording 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, Brouwer measures between 61.50 and 64.25 kilometers in diameter, and its surface has an albedo between 0.045 and 0.051.[4][5][6]
The Collaborative Asteroid Lightcurve Link agrees with IRAS, that is an albedo of 0.045 and a diameter of 64.25 kilometers with an absolute magnitude of 9.95.[3]
Naming
editThis minor planet was named in honor of Dutch–American astronomer Dirk Brouwer (1902–1966). Originally at Leiden University and specialized in celestial mechanics, he became director of the Yale University Observatory and was the president of IAU's commission 20, Positions & Motions of Minor Planets, Comets & Satellites, from 1948 to 1955.[2] The official naming citation was published by the Minor Planet Center on 15 July 1968 (M.P.C. 2883).[11]
Notes
edit- ^ a b Slyusarev (2012) web: rotation period 19.88±0.05 hours with a brightness amplitude of 0.21. Summary figures at Asteroid Lightcurve Database for (1746) Brouwer
References
edit- ^ a b c d e f g "JPL Small-Body Database Browser: 1746 Brouwer (1963 RF)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Archived from the original on 5 August 2020. Retrieved 7 June 2017.
- ^ a b c Schmadel, Lutz D. (2007). "(1746) Brouwer". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 139. doi:10.1007/978-3-540-29925-7_1747. ISBN 978-3-540-00238-3.
- ^ a b c d e f "LCDB Data for (1746) Brouwer". Asteroid Lightcurve Database (LCDB). Retrieved 20 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 Grav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S.; et al. (January 2012). "WISE/NEOWISE Observations of the Hilda Population: Preliminary Results". The Astrophysical Journal. 744 (2): 15. arXiv:1110.0283. Bibcode:2012ApJ...744..197G. doi:10.1088/0004-637X/744/2/197. S2CID 44000310. Retrieved 20 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. 12. Bibcode:2004PDSS...12.....T. Retrieved 17 October 2019.
- ^ a b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. S2CID 119112278. Retrieved 20 December 2016.
- ^ a b Dahlgren, M.; Lahulla, J. F.; Lagerkvist, C.-I.; Lagerros, J.; Mottola, S.; Erikson, A.; et al. (June 1998). "A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids". Icarus. 133 (2): 247–285. Bibcode:1998Icar..133..247D. doi:10.1006/icar.1998.5919. Retrieved 20 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. S2CID 53493339. Retrieved 20 December 2016.
- ^ a b "1746 Brouwer (1963 RF)". Minor Planet Center. Retrieved 20 December 2016.
- ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. Bibcode:2009dmpn.book.....S. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
External links
edit- 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
- 1746 Brouwer at AstDyS-2, Asteroids—Dynamic Site
- 1746 Brouwer at the JPL Small-Body Database