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181797 (1998 MR2)
Classification: Mars-crossing Asteroid          SPK-ID: 2181797
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4615659168214059 3.7183e-08  
a 2.61548105220588 2.3691e-08 au
q 1.408264142415458 9.9725e-08 au
i 27.94734768214258 8.4996e-06 deg
node 106.4441478713969 9.7667e-06 deg
peri 240.7288020942858 1.5313e-05 deg
M 70.47099757924796 1.6457e-05 deg
tp 2458898.063841783549
(2020-Feb-18.56384178)
6.7126e-05 TDB
period 1544.990431496089
4.23
2.0992e-05
5.747e-08
d
yr
n .2330111518240243 3.166e-09 deg/d
Q 3.822697961996302 3.4627e-08 au
  Orbit Determination Parameters
   # obs. used (total)      378  
   data-arc span      11041 days (30.23 yr)  
   first obs. used      1990-11-25  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50227  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:05  

Additional Information
 Earth MOID = .539503 au 
 Jupiter MOID = 2.13589 au 
 T_jup = 3.101 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457901.5 (2017-May-28.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4622626014592935 3.6951e-08  
q 1.405315237467586 9.8927e-08 au
tp 2457355.027696825876
(2015-Nov-28.52769683)
5.0716e-05 TDB
node 106.4859330418573 9.782e-06 deg
peri 240.7890686769746 1.532e-05 deg
i 27.94665999505056 8.4976e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      378  
   data-arc span      11041 days (30.23 yr)  
   first obs. used      1990-11-25  
   last obs. used      2021-02-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50227  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:32:05  

Additional Information
 Jupiter MOID = 2.13589 au 
 T_jup = 3.101 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.36540465376181E-15 -3.626010550089701E-15 -8.145594277198207E-13 -5.365823529690777E-15 -1.522509984219656E-13 -1.774385488263942E-14
q -3.626010550089701E-15 9.786560560782308E-15 2.577400862350981E-12 1.756067274824252E-14 5.08747501281804E-13 5.935686691686968E-14
tp -8.145594277198207E-13 2.577400862350981E-12 2.572079898987271E-9 2.327634770433586E-11 6.120972054653877E-10 6.440475778651532E-11
node -5.365823529690777E-15 1.756067274824252E-14 2.327634770433586E-11 9.56865542220231E-11 -7.813977667410921E-11 -3.376207980286272E-11
peri -1.522509984219656E-13 5.08747501281804E-13 6.120972054653877E-10 -7.813977667410921E-11 2.346945983383906E-10 4.556647782739657E-11
i -1.774385488263942E-14 5.935686691686968E-14 6.440475778651532E-11 -3.376207980286272E-11 4.556647782739657E-11 7.220984025829454E-11

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 15.86   n/a MPCxxxxx  

181797 (1998 MR2)          Discovered 1998-Jun-19 by LINEAR at Socorro
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

[ show close-approach data ]
Alternate Designations
 1998 MR2 = 1994 NA10 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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