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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03512284709337913 2.4012e-08  
a 5.229406324273334 8.7297e-08 au
q 5.045734685556732 1.9713e-07 au
i 19.46893626470791 1.3241e-06 deg
node 263.6387403551072 1.9614e-06 deg
peri 210.4315995998024 4.081e-05 deg
M 291.4672619612903 4.3473e-05 deg
tp 2460032.019792257683
(2023-Mar-28.51979226)
0.0005329 TDB
period 4367.943464387544
11.96
0.00010937
2.994e-07
d
yr
n .0824186491732621 2.0638e-09 deg/d
Q 5.413077962989935 9.0363e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2234  
   data-arc span      10936 days (29.94 yr)  
   first obs. used      1991-03-16  
   last obs. used      2021-02-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .37613  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 03:02:06  

Additional Information
 Earth MOID = 4.07291 au 
 Jupiter MOID = .0493236 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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