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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2020571438039021 5.9081e-08  
a 2.144635920249409 1.1266e-08 AU
q 1.71129691170456 1.2516e-07 AU
i 6.670362882341058 6.4858e-06 deg
node 188.5845916462563 4.0082e-05 deg
peri 108.3085378082427 4.4201e-05 deg
M 108.7282511633292 1.5337e-05 deg
tp 2456454.027561813781
(2013-Jun-10.52756181)
4.9602e-05 JED
period 1147.172665912486
3.14
9.0392e-06
2.475e-08
d
yr
n .3138150085834273 2.4727e-09 deg/d
Q 2.577974928794257 1.3542e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      1263  
   data-arc span      15178 days (41.56 yr)  
   first obs. used      1972-07-13  
   last obs. used      2014-02-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .51815  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 18:06:58  

Additional Information
 Earth MOID = .709705 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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 (413)
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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