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4923 Clarke (1981 EO27)
Classification: Main-belt Asteroid          SPK-ID: 2004923
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2015475674922115 3.11e-08  
a 2.145182625128849 6.0173e-09 au
q 1.712826285207573 6.8555e-08 au
i 6.674604643947479 3.0986e-06 deg
node 188.4827243449936 2.8596e-05 deg
peri 108.6145172821422 2.9962e-05 deg
M 141.3983638759409 7.2371e-06 deg
tp 2458749.748981743306
(2019-Sep-23.24898174)
2.2872e-05 TDB
period 1147.611345169322
3.14
4.8286e-06
1.322e-08
d
yr
n .3136950514783249 1.3199e-09 deg/d
Q 2.577538965050126 7.23e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2214  
   data-arc span      17721 days (48.52 yr)  
   first obs. used      1972-07-13  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47487  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:21:13  

Additional Information
 Earth MOID = .710052 au 
 Jupiter MOID = 2.6552 au 
 T_jup = 3.675 
[ show covariance matrix ]

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 14.31   n/a E2021B10  
diameter diameter 3.367 km 0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.143 h n/a LCDB (Rev. 2020-October); 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]
[Aznar, A.M. (2017) Minor Planet Bull. 44, 60-63.]
geometric albedo albedo 0.366   0.066 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
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 | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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