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21900 Orus (1999 VQ10)
Classification: Jupiter Trojan          SPK-ID: 2021900
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03719290373398525 1.1769e-08  
a 5.124165206199854 6.1143e-08 au
q 4.933582622968626 1.1854e-07 au
i 8.468388378571412 2.6068e-07 deg
node 258.5558795689877 2.2986e-06 deg
peri 179.8083364045525 1.4717e-05 deg
M 289.6059502126317 1.5942e-05 deg
tp 2460028.950495284123
(2023-Mar-25.45049528)
0.00019809 TDB
period 4236.752668771755
11.60
7.5832e-05
2.076e-07
d
yr
n .08497073776656518 1.5209e-09 deg/d
Q 5.314747789431082 6.3417e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2475  
   data-arc span      7635 days (20.90 yr)  
   first obs. used      1998-11-10  
   last obs. used      2019-10-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53872  
   source      ORB  
   producer      Ryan S. Park  
   solution date      2019-Oct-14 07:42:51  

Additional Information
 Earth MOID = 3.94863 au 
 Jupiter MOID = .0224255 au 
 T_jup = 2.977 
[ 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 10.09   n/a E2021B10  
diameter diameter 50.810 km 0.809 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 13.45 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Mottola, S.; Marchi, S.; Buie, M.W.; Hellmich, S.; et al. (2016) DPS 48/EPSC 11, 208.04.]
geometric albedo albedo 0.075   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

21900 Orus           Discovered 1999 Nov. 9 by T. Kobayashi at Oizumi.
Orus was an Achaean warrior who was killed by Hektor in Homer's Iliad.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2016-02-22Last Updated: 2016-02-25

Alternate Designations
 1999 VQ10 = 1998 VD18 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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