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3163 Randi (1981 QM)
Classification: Mars-crossing Asteroid          SPK-ID: 2003163
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .334540871741923 3.2007e-08  
a 2.394496948791943 6.7283e-09 au
q 1.593439852159712 7.7475e-08 au
i 3.088369423536226 3.6911e-06 deg
node 194.0262936242787 6.6897e-05 deg
peri 121.5869160765983 6.704e-05 deg
M 170.361939976241 5.8285e-06 deg
tp 2458360.043061565363
(2018-Aug-29.54306157)
2.0552e-05 TDB
period 1353.380325844048
3.71
5.7043e-06
1.562e-08
d
yr
n .2660006157363657 1.1212e-09 deg/d
Q 3.195554045424174 8.9792e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1844  
   data-arc span      27797 days (76.10 yr)  
   first obs. used      1944-09-13  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47891  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:02:39  

Additional Information
 Earth MOID = .582807 au 
 Jupiter MOID = 2.13525 au 
 T_jup = 3.450 
[ show covariance matrix ]

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 14.0   n/a MPO458861  
diameter diameter 3.883 km 0.833 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 59.50 h n/a LCDB (Rev. 2019-August); 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:
[Higgins, D.J. (2011) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm]
geometric albedo albedo 0.337   0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

3163 Randi (1981 QM)          Discovered 1981-Aug-28 by Kowal, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 QM = 1944 RH = 1970 RK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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