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4923 Clarke (1981 EO27)
Classification: Main-belt Asteroid          SPK-ID: 2004923
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2017110061942256 5.8976e-08  
a 2.145419818460936 9.8082e-09 AU
q 1.712665028170148 1.2488e-07 AU
i 6.670107848272752 5.5765e-06 deg
node 188.5585441219156 3.9836e-05 deg
peri 108.4068944534915 4.2112e-05 deg
M 171.396420774551 1.2923e-05 deg
tp 2456454.030274817941
(2013-Jun-10.53027482)
4.1092e-05 JED
period 1147.801687902876
3.14
7.8711e-06
2.155e-08
d
yr
n .3136430306682581 2.1508e-09 deg/d
Q 2.578174608751724 1.1787e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1411  
   data-arc span      15630 days (42.79 yr)  
   first obs. used      1972-07-13  
   last obs. used      2015-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50336  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 15:49:32  

Additional Information
 Earth MOID = .712919 AU 
 T_jup = 3.675 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3 mag n/a MPO267727  
rotation period rot_per 3.1787 h n/a LCDB (Rev. 2015-May); 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:
[Pravec, P.; Wolf, M.; Sarounova, L. (2013) http://www.asu.cas.cz/~ppravec/neo.htm]
SMASSII spectral type spec_B S   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)

4923 Clarke (1981 EO27)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1981 EO27 = 1972 NJ 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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