6159 Andréseloy

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6159 Andréseloy
Discovery [1]
Discovered by S. Ueda
H. Kaneda
Discovery site Kushiro Obs. (399)
Discovery date 30 December 1991
MPC designation (6159) Andréseloy
Named after
Andrés Eloy Martínez
(Mexican astronomer)[2]
1991 YH · 1987 UY4
1990 OZ1 · 1990 SB17
main-belt · Vesta[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 29.62 yr (10,819 days)
Aphelion 2.4341 AU
Perihelion 2.1482 AU
2.2912 AU
Eccentricity 0.0624
3.47 yr (1,267 days)
0° 17m 3.12s / day
Inclination 6.8577°
Physical characteristics
Mean diameter
5.263±0.033 km[4][5]
5.41 km (calculated)[6]
10.639±0.005 h[7]
10.6590±0.0005 h[8]
0.24 (assumed)[6]
12.8[4] · 13.5[1][6] · 14.28±0.28[9]

6159 Andréseloy, provisional designation 1991 YH, is a Vestian asteroid from the inner regions of the asteroid belt, approximately 5.3 kilometers (3.3 miles) in diameter. It was discovered on 30 December 1991, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at Kushiro Observatory (399) on the island of Hokkaido, Japan. It was named after Mexican astronomer Andrés Eloy Martínez.[2]

Orbit and classification[edit]

Andréseloy is an attributed member of the Vesta family,[3] one of the largest collisional populations of stony asteroids in the asteroid belt. It orbits the Sun in the inner main-belt at a distance of 2.1–2.4 AU (semi-major axis of 2.29 AU) once every 3 years and 6 months (1,267 days). Its orbit has an eccentricity of 0.06 and an inclination of 7° with respect to the ecliptic.[1]

It was first identified as 1987 UY4 at Crimea–Nauchnij in 1987, extending the body's observation arc by 4 years prior to its official discovery observation at Kushiro.[2]


This minor planet was named in honor of Andrés Eloy Martínez, Mexican astronomer and citizen scientist. He is known in his country for the adaptation of the novel The War of the Worlds. He likes to create scientific videos for the Internet. His main concerns are global warming and the impact of an asteroid on Earth.[10]


The name was suggested by the Urania Astronomical Society (Spanish: Sociedad Astronomica Urania) of Mexico. This society was a winner of the "NameExoWorlds" contest organised by International Astronomical Union (IAU) in 2015, and was also awarded the naming right for this asteroid. In total, the naming of 17 minor planets such as 6117 Brevardastro was granted as an award to the contest's winners.[11]

The official naming citation was approved by the IAU's Committee on Small Body Nomenclature and published by the Minor Planet Center on 12 February 2017 (M.P.C. 103029).[12]

Physical characteristics[edit]

Andréseloy has been characterized as a common S-type asteroid.[6]

Rotation and poles[edit]

In March 2006, a rotational lightcurve of Andréseloy was obtained from photometric observations by American astronomer Brian Warner at this Palmer Divide Observatory (716), Colorado. Lightcurve analysis gave an average rotation period of 10.639 hours with a brightness variation of 0.78 magnitude (U=3).[7] Such a high brightness amplitude typically indicates that the body has a non-spheroidal shape.


In 2013, an international study modeled a lightcurve with a concurring period of 10.6590 hours and found a spin axis of (266.0°, 67.0°) and (62.0°, 67.0°) in ecliptic coordinates (λ, β) (Q=2).[8]

Diameter and albedo[edit]

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Andréseloy measures 5.263 kilometers in diameter and its surface has a high albedo of 0.484.[4][5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of its family – and calculates a diameter of 5.41 kilometers with an absolute magnitude of 13.5.[6]


  1. ^ a b c d "JPL Small-Body Database Browser: 6159 Andreseloy (1991 YH)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 13 June 2017. 
  2. ^ a b c "6159 Andreseloy (1991 YH)". Minor Planet Center. Retrieved 13 June 2017. 
  3. ^ a b "Asteroid (6159) Andréseloy – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 July 2018. 
  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" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 13 June 2017. 
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 13 June 2017. 
  6. ^ a b c d e f "LCDB Data for (6159) Andréseloy". Asteroid Lightcurve Database (LCDB). Retrieved 13 June 2017. 
  7. ^ a b Warner, Brian D. (December 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - February - March 2006". The Minor Planet Bulletin. 33 (4): 82–84. Bibcode:2006MPBu...33...82W. ISSN 1052-8091. Retrieved 13 June 2017. 
  8. ^ a b Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv:1309.4296Freely accessible. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 13 June 2017. 
  9. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 13 June 2017. 
  10. ^ "Nombran asteroide en honor a mexicano". El Universal (in Spanish). 17 February 2017. Retrieved 13 June 2017. 
  11. ^ "17 Minor Planets Named by NameExoWorlds Contest Winners". IAU – International Astronomical Union. Retrieved 13 June 2017. 
  12. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 13 June 2017. 

External links[edit]