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21601 (1998 XO89)
Classification: Jupiter Trojan          SPK-ID: 2021601
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03535196170731571 2.4113e-08  
a 5.231536805806327 8.7321e-08 au
q 5.046591716977049 1.9763e-07 au
i 19.466389564625 1.3239e-06 deg
node 263.6437641735615 1.9616e-06 deg
peri 209.8936512182605 4.0354e-05 deg
M 308.1554460070153 4.3101e-05 deg
tp 2460025.923562084130
(2023-Mar-22.42356208)
0.00052736 TDB
period 4370.613013296395
11.97
0.00010943
2.996e-07
d
yr
n .08236830826815333 2.0622e-09 deg/d
Q 5.416481894635605 9.0408e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2247  
   data-arc span      10961 days (30.01 yr)  
   first obs. used      1991-03-16  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37808  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:35:25  

Additional Information
 Earth MOID = 4.07381 au 
 Jupiter MOID = .0480803 au 
 T_jup = 2.884 
[ 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 10.11   n/a E2021B10  
diameter diameter 54.909 km 0.432 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 12.65 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:
[French, L.M.; Stephens, R.D.; Coley, D.R.; Wasserman, L.H.; et al. (2013) Minor Planet Bull. 40, 198-203.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 48-50.]
geometric albedo albedo 0.064   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

21601 (1998 XO89)          Discovered 1998-Dec-15 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 XO89 = 2000 AK195 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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