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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03535196155713635 2.4109e-08  
a 5.231536807112596 8.7258e-08 au
q 5.046591719022807 1.9756e-07 au
i 19.46638955666534 1.3237e-06 deg
node 263.64376419 1.9614e-06 deg
peri 209.8936519695153 4.0308e-05 deg
M 308.1554451547353 4.3047e-05 deg
tp 2460025.923572667055
(2023-Mar-22.42357267)
0.00052667 TDB
period 4370.61301493335
11.97
0.00010935
2.994e-07
d
yr
n .08236830823730337 2.0608e-09 deg/d
Q 5.416481895202383 9.0343e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2280  
   data-arc span      11081 days (30.34 yr)  
   first obs. used      1991-03-16  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37562  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:01:35  

Additional Information
 Earth MOID = 4.07381 au 
 Jupiter MOID = .0480803 au 
 T_jup = 2.884 
[ hide covariance matrix ]
Orbital Elements at Epoch 2458173.5 (2018-Feb-24.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03548555355467331 2.3423e-08  
q 5.034339562138419 1.9387e-07 au
tp 2460063.125025285976
(2023-Apr-28.62502529)
0.00053718 TDB
node 263.64076709785 1.9625e-06 deg
peri 213.2663174648989 4.1186e-05 deg
i 19.47218197518663 1.3241e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2280  
   data-arc span      11081 days (30.34 yr)  
   first obs. used      1991-03-16  
   last obs. used      2021-07-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37562  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:01:35  

Additional Information
 Jupiter MOID = .0480803 au 
 T_jup = 2.884 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.486544285900576E-16 -4.359407919702155E-15 -5.971141839670945E-12 -9.164214461754066E-15 -4.121739259017309E-13 8.05807026691071E-15
q -4.359407919702155E-15 3.758493135170885E-14 4.501340849692225E-11 5.622736872429098E-14 2.901718384395023E-12 -4.784603252037477E-14
tp -5.971141839670945E-12 4.501340849692225E-11 2.885584951882684E-7 5.469175047718884E-10 2.201054283167091E-8 -3.838572652805969E-10
node -9.164214461754066E-15 5.622736872429098E-14 5.469175047718884E-10 3.851409515383269E-12 4.074874683146533E-11 -2.179338440543556E-12
peri -4.121739259017309E-13 2.901718384395023E-12 2.201054283167091E-8 4.074874683146533E-11 1.696256130712476E-9 -2.892920444833312E-11
i 8.05807026691071E-15 -4.784603252037477E-14 -3.838572652805969E-10 -2.179338440543556E-12 -2.892920444833312E-11 1.753358759517839E-12

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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