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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 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2013715059540027 5.8934e-08  
a 2.145009687992418 9.9763e-09 au
q 1.71306585683546 1.2474e-07 au
i 6.675685170776763 5.5802e-06 deg
node 188.5106021528998 3.9775e-05 deg
peri 108.6421517471833 4.2067e-05 deg
M 296.5936980487402 1.3041e-05 deg
tp 2457602.602756848922
(2016-Aug-02.10275685)
4.177e-05 JED
period 1147.472573334111
3.14
8.0052e-06
2.192e-08
d
yr
n .3137329888016229 2.1887e-09 deg/d
Q 2.576953519149377 1.1985e-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 = .710431 au 
 Jupiter MOID = 2.64727 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-December); 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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