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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 ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4616246923848876 3.7179e-08  
a 2.615736296269945 2.3725e-08 au
q 1.408247833144347 9.9735e-08 au
i 27.94515579000797 8.4987e-06 deg
node 106.4422955614484 9.7681e-06 deg
peri 240.7422790174259 1.5312e-05 deg
M 116.110563478529 1.699e-05 deg
tp 2458898.122305283459
(2020-Feb-18.62230528)
6.7115e-05 TDB
period 1545.216599789665
4.23
2.1023e-05
5.756e-08
d
yr
n .2329770467447757 3.1697e-09 deg/d
Q 3.823224759395544 3.4677e-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 = .540696 au 
 Jupiter MOID = 2.13549 au 
 T_jup = 3.100 
[ 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 = 2.13549 au 
 T_jup = 3.100 
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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2067-Jan-09 13:38 < 00:01 Juno 0.0206601603340447 0.0206574102009939 0.0206629221079168 12.6024855967571 12.6024855500314 2476025.067821108 0.831619675730877 934.927965713248 75.3714750548463 -82.9176550717776 40690.0654531195 T 16 CATAB v2.0f-lin.ifort 2021-Apr-13 21:32:06 2021-Apr-13 21:32

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