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624 Hektor (A907 CF)
Classification: Jupiter Trojan          SPK-ID: 2000624
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 107 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02255836667186825 2.1791e-08  
a 5.265411362130747 5.0409e-08 au
q 5.14663228194558 1.0994e-07 au
i 18.15522445721701 3.8634e-07 deg
node 342.7846615323715 2.1544e-06 deg
peri 182.5863552739627 4.6028e-05 deg
M 236.5335705301451 4.5639e-05 deg
tp 2460910.037809335752
(2025-Aug-22.53780934)
0.00057046 TDB
period 4413.131680412812
12.08
6.3374e-05
1.735e-07
d
yr
n .08157472427070769 1.1714e-09 deg/d
Q 5.384190442315914 5.1546e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3872  
   data-arc span      41779 days (114.38 yr)  
   first obs. used      1907-02-11  
   last obs. used      2021-07-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .33458  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 09:20:09  

Additional Information
 Earth MOID = 4.15509 au 
 Jupiter MOID = .269407 au 
 T_jup = 2.899 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 7.32   n/a MPCxxxxx  
diameter diameter 225 km n/a J.G. Williams 9-90  
rotation period rot_per 6.924 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Dunlap, J.L.; Gehrels, T. (1969) Astron. J. 74, 796-803.]
[Magnusson, P. (1983) in Asteroids, Comets, Meteors. C.-I. Lagerkvist, H. Rickman, eds. Uppsala, pp. 77-85.]
[Magnusson, P. (1986) Icarus 68, 1-39.]
[Uchida, K.; Goguen, J.D. (1987) Bull. Amer. Astron. Soc. 19, 842.]
[Michalowski, T. (1988) Acta Astronomica 38, 455-468.]
[De Angelis, G. (1992) in Physical properties of small solar system bodies. A. Brahic, J.-C. Gerard, J. Surdej, eds. Universite de Liege, Institut d'Astrophysique, Liege, pp. 195-201.]
[De Angelis, G. (1995) Planet. Space Sci. 43, 649-682.]
[Szabo, Gy.; Sarneczky, K.; Kiss, L.L. (1999) in Proc. IAU Coll. 173, Evolution and Source Regions of Asteroids and Comets, 185-188.]
[Kaasalainen, M.; Torppa, J.; Piironen, J. (2002) Astron. Astrophys. 383, L19-L22.]
[Lacerda, P.; Jewitt, D.C. (2007) Astron. J. 133, 1393-1408.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hamanowa, H.; Hamanowa, H. (2009) Minor Planet Bull. 36, 87-88.]
[Stephens, R.D. (2009) Minor Planet Bull. 36, 59-62.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Gorshanov, D.L.; Arkharov, A.A.; Larionov, V.M. (2014) Solar System Research 48, 202-211.]
[Marchis, F.; Durech, J.; Castillo-Rogez, J.; Vachier, F.; et al. (2014). Astrophys. J. Let. 783, L37.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2014) Minor Planet Bull. 41, 210-212.]
[Hanus, J.; Delbo, M.; Durech, J.; Ali-Lagoa, V. (2015) Icarus 256, 101-116.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
[Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 43-46.]
geometric albedo albedo 0.025   n/a EAR-A-5-DDR-ALBEDOS-V1.0:TRIAD TRIAD quality code 3
B-V BV 0.776   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=9; phase (min.=3.84, mean=5.77, max.=7.78) deg.
U-B UB 0.249   0.034 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=3.84, mean=6.11, max.=7.78) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

624 Hektor (A907 CF)          Discovered 1907-Feb-10 by Kopff, A. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A907 CF = 1948 VD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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