Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2016289154370927 3.2312e-08  
a 2.144806299999367 6.3981e-09 au
q 1.712351331907851 7.1556e-08 au
i 6.675054488127407 3.2173e-06 deg
node 188.4884568159175 2.8753e-05 deg
peri 108.5616292131039 3.0416e-05 deg
M 78.7005948926536 7.4775e-06 deg
tp 2458749.683527134241
(2019-Sep-23.18352713)
2.3849e-05 TDB
period 1147.30937364365
3.14
5.1337e-06
1.406e-08
d
yr
n .3137776159334461 1.404e-09 deg/d
Q 2.577261268090883 7.6881e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2071  
   data-arc span      17642 days (48.30 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48826  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:47:34  

Additional Information
 Earth MOID = .711501 au 
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456519.5 (2013-Aug-15.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2021955145510605 3.2311e-08  
q 1.711084947756065 7.1608e-08 au
tp 2456454.046597255306
(2013-Jun-10.54659726)
2.6206e-05 TDB
node 188.5871851855109 2.8791e-05 deg
peri 108.3016554978047 3.0431e-05 deg
i 6.670395586335481 3.2152e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2071  
   data-arc span      17642 days (48.30 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48826  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:47:34  

Additional Information
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.043999389336645E-15 -2.308817106809511E-15 2.951530101634954E-13 -1.558190027076484E-14 1.144123042922162E-13 -3.389302763281405E-15
q -2.308817106809511E-15 5.127703467613772E-15 -6.903945509595662E-13 3.518029490258314E-14 -2.662466101974086E-13 7.770638208694801E-15
tp 2.951530101634954E-13 -6.903945509595662E-13 6.867655261714857E-10 -2.122026840278956E-11 2.679944029538188E-10 -1.431187278690721E-12
node -1.558190027076484E-14 3.518029490258314E-14 -2.122026840278956E-11 8.289393191574307E-10 -8.303254203947543E-10 -2.432525728955021E-11
peri 1.144123042922162E-13 -2.662466101974086E-13 2.679944029538188E-10 -8.303254203947543E-10 9.260190658998697E-10 2.368973059339955E-11
i -3.389302763281405E-15 7.770638208694801E-15 -1.431187278690721E-12 -2.432525728955021E-11 2.368973059339955E-11 1.033781098620223E-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. 2019-August); 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 Macias, A. (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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Dec-05 03:52 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin