659 Nestor

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659 Nestor
Discovery [1]
Discovered by M. F. Wolf
Discovery site Heidelberg Obs.
Discovery date 23 March 1908
MPC designation (659) Nestor
Pronunciation /ˈnɛstɔːr/ NES-tor
Named after
Nestor (Greek mythology)[2]
1908 CS · A914 WF
Jupiter trojan[3]
(Greek camp)[4]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 108.40 yr (39,592 days)
Aphelion 5.7842 AU
Perihelion 4.5668 AU
5.1755 AU
Eccentricity 0.1176
11.77 yr (4,301 days)
0° 5m 1.32s / day
Inclination 4.5213°
Jupiter MOID 0.3178 AU
Jupiter Tisserand parameter 2.9800
Physical characteristics
Dimensions 107.06±4.33 km[5]
108.87±4.5 km (IRAS:16)[6]
15.1 h[9]
15.9667±0.0094 h[10]
15.98±0.03 h[11]
16.000±0.260 h[12]
0.0378±0.003 (IRAS:16)[6]
B–V = 0.719[1]
U–B = 0.249[1]
Tholen = XC [1] · P[13]
8.470±0.130 (R)[12] · 8.495±0.001 (R)[10] · 8.52±0.27[14] · 8.99[5][6][7][13]

659 Nestor, provisional designation 1908 CS, is a dark Jupiter trojan from the Greek camp, approximately 110 kilometers in diameter. It was discovered on 23 March 1908, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany, and named after Nestor from Greek mythology.[2][3]

Orbit and classification[edit]

Nestor is orbiting in the leading Greek camp at Jupiter's L4 Lagrangian point, 60° ahead of the giant planet's orbit (see Trojans in astronomy). It orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 9 months (4,301 days). Its orbit has an eccentricity of 0.12 and an inclination of 5° with respect to the ecliptic.[1]

As no precoveries were taken, and no previous identifications were made, Nestor's observation arc begins with its discovery observation in March 1908.[3]

Physical characteristics[edit]

In the Tholen taxonomy, Nestor is classified as a XC-type, as transitional group between the generic X and carbonaceous C-type class. It is also classified as a dark P-type in the Lightcurve Data Base.[13]

Diameter and albedo[edit]

According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Nestor measures between 107.1 and 112.3 kilometers in diameter and its surface has a low albedo between 0.035 and 0.040.[5][6][7][8] The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is, an absolute magnitude of 8.99, an albedo of 0.038 and a diameter of 108.9 kilometers.[13]

A size estimate was also obtained from an occultation event when the asteroid eclipsed the star "TYC 6854-00630" (as designated in the Tycho Catalogue) for a duration of 9.52 seconds. Based on this time period, a diameter of at least 109 kilometers was inferred.[15]

Rotation period[edit]

In January 1988, the first rotational lightcurve of Nestor was obtained by MIT-astronomer Richard P. Binzel showing a rotation period of 15.1 hours (U=2).[9] In August 1995, Italian astronomer Stefano Mottola observed the asteroid with the Bochum 0.61-metre Telescope at ESO's La Silla Observatory, Chile, and derived a period of 15.98±0.03 hours with a brightness variation of 0.31±0.01 magnitude (U=3).[11]

In January and February 2014, two lightcurves were obtained at the Palomar Transient Factory that gave a period of 15.9667±0.0094 and 16.000±0.260 hours with an amplitude of 0.24 and 0.22, respectively (U=2/2).[10][12]


This minor planet was named from Greek mythology for the king of Pylos, Nestor.[2] He was an Argonaut and counselor to the Greeks at Troy. Nestor fought against the centaurs and participated in the hunt for the Calydonian Boar. The asteroid was named by the German Astronomische Gesellschaft during a meeting at Breslau in 1910.[2]


  1. ^ a b c d e f "JPL Small-Body Database Browser: 659 Nestor (1908 CS)" (2016-08-15 last obs.). Jet Propulsion Laboratory. Retrieved 12 December 2016. 
  2. ^ a b c d Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (659) Nestor. Springer Berlin Heidelberg. p. 65. ISBN 978-3-540-00238-3. Retrieved 18 August 2016. 
  3. ^ a b c "659 Nestor (1908 CS)". Minor Planet Center. Retrieved 18 August 2016. 
  4. ^ "List of Jupiter Trojans". Minor Planet Center. 20 June 2016. Retrieved 18 August 2016. 
  5. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 18 August 2016. 
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 18 August 2016. 
  7. ^ 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. Bibcode:2011ApJ...741...90M. arXiv:1109.6407Freely accessible. doi:10.1088/0004-637X/741/2/90. Retrieved 18 August 2016. 
  8. ^ a b c 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. Bibcode:2012ApJ...759...49G. arXiv:1209.1549Freely accessible. doi:10.1088/0004-637X/759/1/49. Retrieved 12 December 2016. 
  9. ^ a b Binzel, Richard P.; Sauter, Linda M. (February 1992). "Trojan, Hilda, and Cybele asteroids - New lightcurve observations and analysis". Icarus: 222–238. Bibcode:1992Icar...95..222B. ISSN 0019-1035. doi:10.1016/0019-1035(92)90039-A. Retrieved 18 August 2016. 
  10. ^ a b c 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. Bibcode:2015AJ....150...75W. arXiv:1504.04041Freely accessible. doi:10.1088/0004-6256/150/3/75. Retrieved 18 August 2016. 
  11. ^ 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 18 August 2016. 
  12. ^ a b c Chang, Chan-Kao; Ip, Wing-Huen; Lin, Hsing-Wen; Cheng, Yu-Chi; Ngeow, Chow-Choong; Yang, Ting-Chang; et al. (August 2015). "Asteroid Spin-rate Study Using the Intermediate Palomar Transient Factory". The Astrophysical Journal Supplement Series. 219 (2): 19. Bibcode:2015ApJS..219...27C. arXiv:1506.08493Freely accessible. doi:10.1088/0067-0049/219/2/27. Retrieved 18 August 2016. 
  13. ^ a b c d "LCDB Data for (659) Nestor". Asteroid Lightcurve Database (LCDB). Retrieved 18 August 2016. 
  14. ^ 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. Retrieved 18 August 2016. 
  15. ^ "Occultation of TYC 6854-00630-1 by (659) Nestor in 30 June 2006". The Royal Astronomical Society of New Zealand – Occultation Section. Retrieved 18 August 2016. 

External links[edit]