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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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2017110060918592 5.8983e-08  
a 2.145419818427259 9.8236e-09 AU
q 1.712665028362883 1.2489e-07 AU
i 6.670108074899426 5.5843e-06 deg
node 188.5585446262964 3.9843e-05 deg
peri 108.4068939233061 4.2134e-05 deg
M 171.3964208114458 1.294e-05 deg
tp 2456454.030274713175
(2013-Jun-10.53027471)
4.1159e-05 JED
period 1147.80168787585
3.14
7.8834e-06
2.158e-08
d
yr
n .3136430306756431 2.1542e-09 deg/d
Q 2.578174608491635 1.1805e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1397  
   data-arc span      15589 days (42.68 yr)  
   first obs. used      1972-07-13  
   last obs. used      2015-03-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50462  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Apr-07 16:20:00  

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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