5028 Halaesus

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5028 Halaesus
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date 23 January 1988
MPC designation (5028) Halaesus
Pronunciation həˈliːsəs
Named after
(Greek mythology)[2]
1988 BY1 · 1985 US2
Jupiter trojan[3]
(Greek camp)
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 28.06 yr (10,250 days)
Aphelion 5.9459 AU
Perihelion 4.5804 AU
5.2631 AU
Eccentricity 0.1297
12.07 yr (4,410 days)
Inclination 21.488°
Jupiter MOID 0.3787 AU
Jupiter Tisserand parameter 2.844
Physical characteristics
Dimensions 50.77±0.38 km[4]
24.937±0.015 h[5]
C[6] · D[7]

5028 Halaesus (hə-lee'-səs), provisional designation 1988 BY1, is a Jupiter trojan from the Greek camp, approximately 51 kilometers in diameter. It was discovered by American astronomer Carolyn Shoemaker at the U.S. Palomar Observatory, California, on 23 January 1988.[3]

The asteroid is orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of its orbit (see Trojans in astronomy). The carbonaceous C-type body has also been rated as a rare D-type asteroid by a large-scale survey performed by Pan-STARRS.[7] It orbits the Sun at a distance of 4.6–5.9 AU once every 12 years and 1 month (4,410 days) with an eccentricity of 0.13 and an inclination of 21° in respect of the ecliptic.[1]

In September 1996, the body was observed by Stefano Mottola using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. The resulting rotational light-curve showed a well-defined period of 24.937±0.015 hours with a brightness variation of 0.29±0.01 in magnitude (U=3).[5] According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 55.8 kilometers in diameter and its surface has a typically low albedo of 0.057.[4]

The minor planet was named from Greek mythology after Halaesus, a son of king Agamemnon, after whom the asteroid 911 Agamemnon is named.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 5028 Halaesus (1988 BY1)" (2016-02-15 last obs.). Jet Propulsion Laboratory. Retrieved 14 April 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (5028) Halaesus. Springer Berlin Heidelberg. p. 432. ISBN 978-3-540-00238-3. Retrieved 14 April 2016. 
  3. ^ a b "5028 Halaesus (1988 BY1)". Minor Planet Center. Retrieved 14 April 2016. 
  4. ^ 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 14 April 2016. 
  5. ^ a b 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 14 April 2016. 
  6. ^ a b "LCDB Data for (5028) Halaesus". Asteroid Lightcurve Database (LCDB). Retrieved 14 April 2016. 
  7. ^ 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. Bibcode:2015Icar..261...34V. arXiv:1506.00762Freely accessible. doi:10.1016/j.icarus.2015.08.007. 

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