5028 Halaesus
Discovery [1] | |
---|---|
Discovered by | C. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 23 January 1988 |
Designations | |
MPC designation | (5028) Halaesus |
Pronunciation | /həˈliːsəs/ · hə-LEE-səs |
Named after |
Halaesus (Greek mythology)[2] |
1988 BY1 · 1985 US2 | |
Jupiter trojan [1][3] Greek [4] · background [5] | |
Orbital characteristics [3] | |
Epoch 23 March 2018 (JD 2458200.5) | |
Uncertainty parameter 0 | |
Observation arc | 29.18 yr (10,657 d) |
Aphelion | 5.9474 AU |
Perihelion | 4.5802 AU |
5.2638 AU | |
Eccentricity | 0.1299 |
12.08 yr (4,411 d) | |
232.54° | |
0° 4m 53.76s / day | |
Inclination | 21.478° |
44.049° | |
11.288° | |
Jupiter MOID | 0.382 AU |
TJupiter | 2.8450 |
Physical characteristics | |
Mean diameter | ±0.38 km 50.77[6] |
±0.015 h 24.937[7] | |
±0.007 0.057[6] | |
D Pan-STARRS[8][9] D (SDSS-MOC)[10] V–I = ±0.069 0.900[8] | |
10.2[3][6][8] ±0.46 10.33[9] | |
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5028 Halaesus (/həˈliːsəs/ hə-LEE-səs), provisional designation 1988 BY1, is a Jupiter trojan from the Greek camp, approximately 51 kilometers (32 miles) in diameter. It was discovered on 23 January 1988, by American astronomer Carolyn Shoemaker at the Palomar Observatory in California.[1] The dark D-type asteroid has a rotation period of 24.9 hours and belongs to the 100 largest Jupiter trojans.[8] It was named after Halaesus from Greek mythology.[2]
Orbit and classification
Halaesus is a Jovian asteroid orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the Gas Giant's orbit in a 1:1 resonance .[4] It is a non-family asteroid in the Jovian background population.[5]
It orbits the Sun at a distance of 4.6–5.9 AU once every 12 years and 1 month (4,411 days; semi-major axis of 5.26 AU). Its orbit has an eccentricity of 0.13 and an inclination of 21° with respect to the ecliptic.[3]
The asteroid was first observed as 1985 US2 at CERGA Observatory in October 1985. The body's observation arc begins with its official discovery observation at Palomar in January 1988.[1]
Physical characteristics
In the SDSS-based taxonomy, Halaesus is a D-type asteroid.[10] Pan-STARRS' survey also characterized it as a D-type, the most common spectral type among the Jupiter trojan population. It has a typical V–I color index of 0.90.[8][9]
Rotation period
In September 1996, photometric observations of Halaesus were made by Italian astronomer Stefano Mottola, using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. The resulting rotational lightcurve showed a well-defined period of ±0.015 hours with a brightness variation of 24.937±0.01 in 0.29magnitude (U=3).[7]
In August 2015, observations by the Kepler space telescope gave two period determinations of 25.052 and 29.95 hours with an amplitude of 0.23 and 0.19 magnitude, respectively (U=2+/3-).[11][12]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Halaesus measures 50.77 kilometers in diameter and its surface has an albedo of 0.057.[6] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.057 and a diameter 50.77 of kilometers based on an absolute magnitude of 10.2.[8]
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Naming
This minor planet was named from Greek mythology after Halaesus, a son of king Agamemnon, after whom the asteroid 911 Agamemnon is named.[2] The official naming citation was published by the Minor Planet Center on 4 June 1993 (M.P.C. 22248).[13]
References
- 1 2 3 4 "5028 Halaesus (1988 BY1)". Minor Planet Center. Retrieved 19 June 2018.
- 1 2 3 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5028) Halaesus. Springer Berlin Heidelberg. p. 432. ISBN 978-3-540-00238-3. Retrieved 19 June 2018.
- 1 2 3 4 "JPL Small-Body Database Browser: 5028 Halaesus (1988 BY1)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 19 June 2018.
- 1 2 "List of Jupiter Trojans". Minor Planet Center. 1 June 2018. Retrieved 19 June 2018.
- 1 2 "Asteroid (5028) Halaesus – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 19 June 2018.
- 1 2 3 4 Grav, T.; Mainzer, A. K.; Bauer, J. M.; Masiero, J. R.; Nugent, C. R. (November 2012). "WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy". The Astrophysical Journal. 759 (1): 10. arXiv:1209.1549. Bibcode:2012ApJ...759...49G. doi:10.1088/0004-637X/759/1/49. Retrieved 19 June 2018. (online catalog)
- 1 2 Mottola, Stefano; Di Martino, Mario; Erikson, Anders; Gonano-Beurer, Maria; Carbognani, Albino; Carsenty, Uri; et al. (May 2011). "Rotational Properties of Jupiter Trojans. I. Light Curves of 80 Objects". The Astronomical Journal. 141 (5): 32. Bibcode:2011AJ....141..170M. doi:10.1088/0004-6256/141/5/170. Retrieved 19 June 2018.
- 1 2 3 4 5 6 "LCDB Data for (5028) Halaesus". Asteroid Lightcurve Database (LCDB). Retrieved 19 June 2018.
- 1 2 3 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" (PDF). Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 19 June 2018.
- 1 2 Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 19 June 2018.
- ↑ Szabó, Gy. M.; Pál, A.; Kiss, Cs.; Kiss, L. L.; Molnár, L.; Hanyecz, O.; et al. (March 2017). "The heart of the swarm: K2 photometry and rotational characteristics of 56 Jovian Trojan asteroids" (PDF). Astronomy and Astrophysics. 599: 13. arXiv:1609.02760. Bibcode:2017A&A...599A..44S. doi:10.1051/0004-6361/201629401. Retrieved 19 June 2018.
- ↑ Ryan, Erin Lee; Sharkey, Benjamin N. L.; Woodward, Charles E. (March 2017). "Trojan Asteroids in the Kepler Campaign 6 Field". The Astronomical Journal. 153 (3): 12. Bibcode:2017AJ....153..116R. doi:10.3847/1538-3881/153/3/116. Retrieved 19 June 2018.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 June 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
- Asteroid 5028 Halaesus at the Small Bodies Data Ferret
- 5028 Halaesus at AstDyS-2, Asteroids—Dynamic Site
- 5028 Halaesus at the JPL Small-Body Database