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101931 (1999 RZ20)
Classification: Mars-crossing Asteroid          SPK-ID: 2101931
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3129063707017527 6.8644e-08  
a 2.369805731893682 1.0792e-08 au
q 1.628278421058619 1.6267e-07 au
i 6.613388522234908 7.1407e-06 deg
node 343.2818454913311 4.1766e-05 deg
peri 2.593443032442197 4.2712e-05 deg
M 301.6420135194871 1.4463e-05 deg
tp 2459416.505765644923
(2021-Jul-21.00576564)
5.4732e-05 TDB
period 1332.501004950522
3.65
9.1018e-06
2.492e-08
d
yr
n .2701686517777653 1.8454e-09 deg/d
Q 3.111333042728745 1.4168e-08 au
  Orbit Determination Parameters
   # obs. used (total)      382  
   data-arc span      9570 days (26.20 yr)  
   first obs. used      1994-03-04  
   last obs. used      2020-05-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56635  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:27  

Additional Information
 Earth MOID = .619381 au 
 Jupiter MOID = 2.31439 au 
 T_jup = 3.469 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457174.5 (2015-Jun-01.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3120111542237344 6.8465e-08  
q 1.631457763245546 1.6193e-07 au
tp 2456748.118680328067
(2014-Mar-31.61868033)
4.0692e-05 TDB
node 343.3323009019045 4.1705e-05 deg
peri 2.202546718260774 4.2662e-05 deg
i 6.618925515271108 7.1338e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      382  
   data-arc span      9570 days (26.20 yr)  
   first obs. used      1994-03-04  
   last obs. used      2020-05-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56635  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:27  

Additional Information
 Jupiter MOID = 2.31439 au 
 T_jup = 3.469 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.687428222804038E-15 -1.107432641326322E-14 1.082459399222122E-12 3.362932097365427E-14 1.662732646158845E-13 -2.891449391011425E-16
q -1.107432641326322E-14 2.622205996085996E-14 -2.353891825191254E-12 -8.230058261619779E-14 -3.466158926309545E-13 3.957469624628821E-16
tp 1.082459399222122E-12 -2.353891825191254E-12 1.655804981760107E-9 -4.325771978167843E-12 3.807770589211507E-10 -2.942166046360316E-12
node 3.362932097365427E-14 -8.230058261619779E-14 -4.325771978167843E-12 1.739339824809662E-9 -1.728829418927695E-9 8.905604739501631E-11
peri 1.662732646158845E-13 -3.466158926309545E-13 3.807770589211507E-10 -1.728829418927695E-9 1.820086114848069E-9 -8.918961688528687E-11
i -2.891449391011425E-16 3.957469624628821E-16 -2.942166046360316E-12 8.905604739501631E-11 -8.918961688528687E-11 5.089054161784847E-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 16.73   n/a E2021B55  

101931 (1999 RZ20)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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