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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2016289156571559 3.2158e-08  
a 2.144806299960712 6.3518e-09 au
q 1.712351331404997 7.1176e-08 au
i 6.675054556398381 3.2039e-06 deg
node 188.4884564739562 2.872e-05 deg
peri 108.5616296681276 3.0348e-05 deg
M 78.70059482818687 7.4436e-06 deg
tp 2458749.683527346476
(2019-Sep-23.18352735)
2.3728e-05 TDB
period 1147.309373612634
3.14
5.0966e-06
1.395e-08
d
yr
n .3137776159419289 1.3939e-09 deg/d
Q 2.577261268516426 7.6325e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2086  
   data-arc span      17656 days (48.34 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48662  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:19:53  

Additional Information
 Earth MOID = .711501 au 
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456533.5 (2013-Aug-29.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2021888628900028 3.2159e-08  
q 1.711085074500666 7.1231e-08 au
tp 2456454.045454211974
(2013-Jun-10.54545421)
2.5957e-05 TDB
node 188.5870016980366 2.8758e-05 deg
peri 108.301393880643 3.0363e-05 deg
i 6.670423307736536 3.2018e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2086  
   data-arc span      17656 days (48.34 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-11-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48662  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:19:53  

Additional Information
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.034192776873338E-15 -2.285843396772652E-15 2.838617835460556E-13 -1.54785954304186E-14 1.098935660574672E-13 -3.295784599200613E-15
q -2.285843396772652E-15 5.073882842535572E-15 -6.639334993462456E-13 3.492331657355409E-14 -2.556431118756707E-13 7.555051972294613E-15
tp 2.838617835460556E-13 -6.639334993462456E-13 6.737431571257734E-10 -2.092416824916922E-11 2.62606959889651E-10 -1.361465190181079E-12
node -1.54785954304186E-14 3.492331657355409E-14 -2.092416824916922E-11 8.270422366368299E-10 -8.283235439728748E-10 -2.392477307042571E-11
peri 1.098935660574672E-13 -2.556431118756707E-13 2.62606959889651E-10 -8.283235439728748E-10 9.219217570630724E-10 2.331883794165239E-11
i -3.295784599200613E-15 7.555051972294613E-15 -1.361465190181079E-12 -2.392477307042571E-11 2.331883794165239E-11 1.025149078661489E-11

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 14.3   n/a MPO267727  
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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