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187847 (1999 XM138)
Classification: Main-belt Asteroid          SPK-ID: 2187847
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1768377326410789 1.0434e-07  
a 3.191734474269573 2.8119e-08 au
q 2.627315386647376 3.3701e-07 au
i 26.42427133348534 1.3635e-05 deg
node 230.236917292265 1.268e-05 deg
peri 316.9018830706638 2.6317e-05 deg
M 123.6835446147084 2.108e-05 deg
tp 2458484.936827399669
(2019-Jan-01.43682740)
0.00012345 TDB
period 2082.756788209682
5.70
2.7524e-05
7.536e-08
d
yr
n .1728478341964511 2.2842e-09 deg/d
Q 3.75615356189177 3.3092e-08 au
  Orbit Determination Parameters
   # obs. used (total)      391  
   data-arc span      7479 days (20.48 yr)  
   first obs. used      1999-12-04  
   last obs. used      2020-05-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57725  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:57:04  

Additional Information
 Earth MOID = 1.6704 au 
 Jupiter MOID = 1.41217 au 
 T_jup = 3.011 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457321.5 (2015-Oct-26.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1750108613296895 1.0444e-07  
q 2.633634859828728 3.3488e-07 au
tp 2456400.046955284565
(2013-Apr-17.54695528)
0.0001316 TDB
node 230.3770419604249 1.2695e-05 deg
peri 316.5539818543278 2.6816e-05 deg
i 26.45275806962912 1.3633e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      391  
   data-arc span      7479 days (20.48 yr)  
   first obs. used      1999-12-04  
   last obs. used      2020-05-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57725  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:57:04  

Additional Information
 Jupiter MOID = 1.41217 au 
 T_jup = 3.011 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.090819489938123E-14 -3.489811439265155E-14 8.57284599909337E-12 9.066660822927216E-14 1.353688904929003E-12 -7.382957884894367E-14
q -3.489811439265155E-14 1.121458973417196E-13 -2.823915146458094E-11 -2.903039970154773E-13 -4.433921659072365E-12 2.520635199920175E-13
tp 8.57284599909337E-12 -2.823915146458094E-11 1.731913050948233E-8 8.817783586513058E-11 3.106360394850155E-9 -8.443512316804644E-11
node 9.066660822927216E-14 -2.903039970154773E-13 8.817783586513058E-11 1.611745994450295E-10 -1.279386041358999E-10 -6.924142083279403E-11
peri 1.353688904929003E-12 -4.433921659072365E-12 3.106360394850155E-9 -1.279386041358999E-10 7.191084040136442E-10 4.986638687896088E-11
i -7.382957884894367E-14 2.520635199920175E-13 -8.443512316804644E-11 -6.924142083279403E-11 4.986638687896088E-11 1.858512097602295E-10

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.85   n/a E2021B55  
rotation period rot_per 10.0166 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

187847 (1999 XM138)          Discovered 1999-Dec-04 by Spacewatch at Kitt Peak
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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Alternate Designations
 1999 XM138 = 2002 JJ56 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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