10645 Brač, provisional designation 1999 ES4, is a stony Eunomia asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 14 March 1999, by Croatian astronomer Korado Korlević at Višnjan Observatory, and named after the Croatian island of Brač.[2][8]
| Discovery[1] | |
|---|---|
| Discovered by | K. Korlević |
| Discovery site | Višnjan Obs. |
| Discovery date | 14 March 1999 |
| Designations | |
| (10645) Brač | |
Named after | Brač (Croatian island)[2] |
| 1999 ES4 · 1962 TN 1968 BF · 1975 TJ1 1980 YK · 1986 EH5 1988 SX4 | |
| main-belt · Eunomia[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 54.67 yr (19,968 days) |
| Aphelion | 3.1430 AU |
| Perihelion | 2.1725 AU |
| 2.6578 AU | |
| Eccentricity | 0.1826 |
| 4.33 yr (1,583 days) | |
| 224.98° | |
| 0° 13m 39s / day | |
| Inclination | 12.520° |
| 351.57° | |
| 44.961° | |
| Physical characteristics | |
| Dimensions | 9.60 km (calculated)[3] 10.26±0.11 km[4] |
| 2.785±0.005 h[5] 2.78592±0.00003 h[6] | |
| 0.202±0.038[4] 0.21 (assumed)[3] | |
| S[3] · LS[7] | |
| 12.5[1] · 12.4[3] · 12.3[4] · 12.41±0.50[7] | |
Classification and orbit
editThe asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 4 months (1,583 days). Its orbit has an eccentricity of 0.18 and an inclination of 13° with respect to the ecliptic.[1] The first precovery was taken at the U.S. Goethe Link Observatory in 1962, extending the asteroid's observation arc by 37 years prior to discovery.[8]
Physical characteristics
editIn October 2014, photometric observations by Italian astronomer Silvano Casulli gave a rotational lightcurve with a period of 2.78592±0.00003 hours and a brightness amplitude of 0.31 in magnitude (U=3-).[6] Three weeks later, a second lightcurve was obtained at the U.S. Etscorn Campus Observatory in New Mexico, rendering a concurring period of 2.785±0.005 with an identical variation in brightness (U=3-).[5]
According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 10.3 kilometers in diameter and its surface has an albedo of 0.202±0.038,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 and calculates a diameter of 9.6 kilometers.[3] A large-scale survey by Pan-STARRS (PS1) assigns an LS-type, an intermediary spectral type between the common, stony S-types and the rather rare and reddish L-type asteroids.[7]
Naming
editThis minor planet was named after the Croatian island of Brač, the largest Dalmatian island in the Adriatic Sea, and the place where the Blaca hermitage Observatory is located.[2] The approved naming citation was published by the Minor Planet Center on 15 December 2005 (M.P.C. 55720).[9]
References
edit- ^ a b c d "JPL Small-Body Database Browser: 10645 Brac (1999 ES4)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
- ^ a b c Schmadel, Lutz D. (2006). "(10645) Brač [2.66, 0.18, 12.5]". Dictionary of Minor Planet Names – (10645) Brač, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 55. doi:10.1007/978-3-540-34361-5_477. ISBN 978-3-540-34360-8.
- ^ a b c d e f "LCDB Data for (10645) Brac". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
- ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 17 May 2016.
- ^ a b Klinglesmith, Daniel A.; DeHart, Austin; Hanowell, Jesse; Hendrickx, Sebastian (April 2015). "Asteroids at Etscorn Campus Observatory: 2014 September - December". The Minor Planet Bulletin. 42 (2): 101–104. Bibcode:2015MPBu...42..101K. ISSN 1052-8091. Retrieved 17 May 2016.
- ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (10645) Brac". Geneva Observatory. Retrieved 17 May 2016.
- ^ a b c 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 17 May 2016.
- ^ a b "10645 Brac (1999 ES4)". Minor Planet Center. Retrieved 12 April 2016.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.
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 (10001)-(15000) – Minor Planet Center
- 10645 Brač at AstDyS-2, Asteroids—Dynamic Site
- 10645 Brač at the JPL Small-Body Database
