3451 Mentor

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3451 Mentor
Discovery [1]
Discovered by A. Mrkos
Discovery site Kleť Obs.
Discovery date 19 April 1984
MPC designation (3451) Mentor
Pronunciation /mɛntɔːr/ (MEN-tor)
Named after
Mentor (Greek mythology)[1]
1984 HA1 · 1950 HG1
Jupiter trojan[1][2]
(Trojan camp)[3]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 34.86 yr (12,733 d)
Aphelion 5.4935 AU
Perihelion 4.7828 AU
5.1382 AU
Eccentricity 0.0692
11.65 yr (4,254 d)
0° 5m 4.56s / day
Inclination 24.654°
Jupiter MOID 0.0573 AU
TJupiter 2.8150
Physical characteristics
Mean diameter
116.30 km (calculated)[4]
117.91±3.19 km[5]
126.29±1.64 km[6]
7.6 h[7]
7.677±0.0041 h[8]
7.68±0.01 h[9]
7.68±0.10 h[10]
7.682 h[11]
7.696±0.001 h[12]
7.699±0.001 h[7]
7.700±0.019 h[13]
7.70±0.02 h[14]
7.702±0.002 h[15]
7.727±0.004 h[7]
7.730±0.001 h[16]
0.057 (assumed)[4]
SMASS = X[2] · P[17] · X[18] · C[4]
8.10[5] · 8.4[2][4] · 8.5[6]
8.637±0.002 (S)[8]

3451 Mentor (/mɛntɔːr/ MEN-tor), provisional designation 1984 HA1, is a Jupiter trojan from the Trojan camp, approximately 120 kilometers (75 miles) in diameter. It was discovered on 19 April 1984, by Czech astronomer Antonín Mrkos at the Kleť Observatory in the Czech Republic, the asteroid was named after Mentor from Greek mythology.[1]

Orbit and classification[edit]

Mentor is one of the largest Jupiter trojans. It is located in the L5 Lagrangian point, 60° behind Jupiter in the so-called Trojan camp.[3] It orbits the Sun at a distance of 4.8–5.5 AU once every 11 years and 8 months (4,254 days; semi-major axis of 5.14 AU). Its orbit has an eccentricity of 0.07 and an inclination of 25° with respect to the ecliptic.[2]

The asteroid was first observed as 1950 HG1 at Simeiz Observatory in April 1950. The body's observation arc begins at Crimea–Nauchnij in March 1953, or one month prior to its official discovery observation at Klet.[1]

Physical characteristics[edit]

In the SMASS classification and based on observations by Pan-STARRS, Mentor is an X-type asteroid.[2][18] It has also been characterized as a primitive P-type asteroid by the Wide-field Infrared Survey Explorer (WISE),[17] while the Collaborative Asteroid Lightcurve Link assumes it to be a carbonaceous C-type.[4]

Rotation period[edit]

Photometric observations of this asteroid during 1998 were used to build a lightcurve showing a rotation period of 7.700±0.005 hours with a brightness variation of 0.15±0.01 magnitude.[13][4]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Mentor measures between 117.91 and 126.29 kilometers in diameter and its surface has an albedo between 0.044 and 0.075.[5][6] CALL assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 116.30 kilometers based on an absolute magnitude of 8.4.[4] It is likely the largest Jupiter trojan for which there is no IRAS data available.


This minor planet was named by the discoverer for the father of Imbrius and son of spearman Imbrus at Pedaseus, who was with the Trojans against the Greeks in the Trojan War;[1] in Homer's Illiad, Mentor was described as a man who was rich in horse. The official naming citation was published by the Minor Planet Center on 29 November 1993 (M.P.C. 22829).[19]


  1. ^ a b c d e f "3451 Mentor (1984 HA1)". Minor Planet Center. Retrieved 5 March 2018. 
  2. ^ a b c d e f "JPL Small-Body Database Browser: 3451 Mentor (1984 HA1)" (2018-01-22 last obs.). Jet Propulsion Laboratory. Retrieved 5 March 2018. 
  3. ^ a b "List of Jupiter Trojans". Minor Planet Center. 4 October 2017. Retrieved 5 March 2018. 
  4. ^ a b c d e f g "LCDB Data for (3451) Mentor". Asteroid Lightcurve Database (LCDB). Retrieved 5 March 2018. 
  5. ^ a b c d "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey (Online Data Query)". October 2011. Retrieved 18 August 2016. 
  6. ^ a b c d "WISE/NEOWISE Observations of the Jovian Trojan Population (Online Data Query) (NB. pad asteroid # to 5 digits with leading 0s)". Retrieved 18 August 2016. 
  7. ^ a b c d Behrend, Raoul. "Asteroids and comets rotation curves – (3451) Mentor". Geneva Observatory. Retrieved 5 March 2018. 
  8. ^ a b Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 5 March 2018. 
  9. ^ Stephens, Robert D.; French, Linda M.; Davitt, Chelsea; Coley, Daniel R. (April 2014). "At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013". The Minor Planet Bulletin. 41 (2): 95–100. Bibcode:2014MPBu...41...95S. ISSN 1052-8091. Retrieved 5 March 2018. 
  10. ^ Melita, M. D.; Duffard, R.; Williams, I. P.; Jones, D. C.; Licandro, J.; Ortiz, J. L. (June 2010). "Lightcurves of 6 Jupiter Trojan asteroids". Planetary and Space Science. 58 (7-8): 1035–1039. Bibcode:2010P&SS...58.1035M. doi:10.1016/j.pss.2010.03.009. Retrieved 5 March 2018. 
  11. ^ Duffard, R. D.; Melita, M.; Ortiz, J. L.; Licandro, J.; Williams, I. P.; Jones, D. (December 2007). "Light-Curve Survey of the Trojan Asteroids". Asteroids. Bibcode:2008LPICo1405.8187D. Retrieved 5 March 2018. 
  12. ^ Stephens, Robert D.; Coley, Daniel R.; French, Linda M. (July 2016). "A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies". The Minor Planet Bulletin. 43 (3): 265–270. Bibcode:2016MPBu...43..265S. ISSN 1052-8091. Retrieved 5 March 2018. 
  13. ^ 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 5 March 2018. 
  14. ^ Sauppe, Jason; Torno, Steven; Lemke-Oliver, Robert; Ditteon, Richard (December 2007). "Asteroid Lightcurve Analysis at the Oakley Observatory - March/April 2007". The Minor Planet Bulletin. 34 (4): 119–122. Bibcode:2007MPBu...34..119S. ISSN 1052-8091. Retrieved 5 March 2018. 
  15. ^ Stephens, Robert D.; Coley, Daniel R. (July 2017). "Lightcurve Analysis of Trojan Asteroids at the Center for Solar System Studies 2017 January - March". The Minor Planet Bulletin. 44 (3): 252–257. Bibcode:2017MPBu...44..252S. ISSN 1052-8091. Retrieved 5 March 2018. 
  16. ^ French, Linda M.; Stephens, Robert D.; Lederer, Susan M.; Coley, Daniel R.; Rohl, Derrick A. (April 2011). "Preliminary Results from a Study of Trojan Asteroids". The Minor Planet Bulletin. 38 (2): 116–120. Bibcode:2011MPBu...38..116F. ISSN 1052-8091. Retrieved 5 March 2018. 
  17. ^ a b 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 18 August 2016. 
  18. ^ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 5 March 2018. 
  19. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 5 March 2018. 

External links[edit]