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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 ]

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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 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3346384265086185 3.1379e-08  
a 2.394268543684842 6.6139e-09 au
q 1.593054285587066 7.6139e-08 au
i 3.088822453247768 3.6494e-06 deg
node 194.0157556999529 6.1748e-05 deg
peri 121.6182024221 6.1887e-05 deg
M 223.5297533127396 5.9382e-06 deg
tp 2459713.471447224580
(2022-May-13.97144722)
2.3653e-05 TDB
period 1353.186687088241
3.70
5.6071e-06
1.535e-08
d
yr
n .2660386799803954 1.1024e-09 deg/d
Q 3.195482801782619 8.8272e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2007  
   data-arc span      27950 days (76.52 yr)  
   first obs. used      1944-09-13  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47457  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 20:47:13  

Additional Information
 Earth MOID = .580458 au 
 Jupiter MOID = 2.13541 au 
 T_jup = 3.450 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.03   n/a MPCxxxxx  
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. 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:
[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

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