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1420 Radcliffe (1931 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2001420
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07667043369279107 3.5291e-08  
a 2.748652360988172 9.5087e-09 au
q 2.537911992400495 9.5995e-08 au
i 3.485515290722254 3.2689e-06 deg
node 260.8993761242555 6.1012e-05 deg
peri 74.18444514722876 6.5628e-05 deg
M 191.5959751710861 2.6387e-05 deg
tp 2459779.124591587992
(2022-Jul-18.62459159)
0.00012352 TDB
period 1664.478347571835
4.56
8.6371e-06
2.365e-08
d
yr
n .2162839790167131 1.1223e-09 deg/d
Q 2.959392729575849 1.0238e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3303  
   data-arc span      32415 days (88.75 yr)  
   first obs. used      1931-09-14  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43512  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:31:04  

Additional Information
 Earth MOID = 1.5306 au 
 Jupiter MOID = 2.30869 au 
 T_jup = 3.340 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456748.5 (2014-Apr-01.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07589975076119448 3.5135e-08  
q 2.539421120008913 9.5553e-08 au
tp 2456438.578032284384
(2013-May-26.07803228)
0.00011921 TDB
node 261.1659418595202 6.0891e-05 deg
peri 71.72945374834032 6.5646e-05 deg
i 3.489194322482101 3.273e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3303  
   data-arc span      32415 days (88.75 yr)  
   first obs. used      1931-09-14  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43512  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:31:04  

Additional Information
 Jupiter MOID = 2.30869 au 
 T_jup = 3.340 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.234452887347153E-15 -3.343281153938614E-15 6.726008932141092E-13 2.444250246019391E-16 1.206467696979458E-13 5.619718738918209E-16
q -3.343281153938614E-15 9.130456450044343E-15 -1.532534867052156E-12 -2.046357682611259E-15 -2.649318426402501E-13 -1.453999525200446E-15
tp 6.726008932141092E-13 -1.532534867052156E-12 1.421072902482649E-8 -1.712691779996525E-11 2.943142071632946E-9 7.153617462315043E-13
node 2.444250246019391E-16 -2.046357682611259E-15 -1.712691779996525E-11 3.707729634973571E-9 -3.704036783418029E-9 1.954254100777178E-11
peri 1.206467696979458E-13 -2.649318426402501E-13 2.943142071632946E-9 -3.704036783418029E-9 4.30934824114099E-9 -1.936408342360324E-11
i 5.619718738918209E-16 -1.453999525200446E-15 7.153617462315043E-13 1.954254100777178E-11 -1.936408342360324E-11 1.071268857630894E-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 12.0   n/a MPO365260  
diameter diameter 20.524 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.792 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Klinglesmith III, D.A.; Hanowell, J.; Risley, E.; Turk, J.; et al. (2014) Minor Planet Bull. 41, 82-84.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.047   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1420 Radcliffe (1931 RJ)          Discovered 1931-Sep-14 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1931 RJ = 1931 TF = 1935 OM = 1963 TM = 1963 VB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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