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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2016289127903938 3.2483e-08  
a 2.14480630062992 6.4455e-09 au
q 1.712351338087923 7.1975e-08 au
i 6.675054413880938 3.2307e-06 deg
node 188.4884573588726 2.88e-05 deg
peri 108.5616275590846 3.0498e-05 deg
M 78.70059543979606 7.5107e-06 deg
tp 2458749.683525279908
(2019-Sep-23.18352528)
2.3968e-05 TDB
period 1147.309374149597
3.14
5.1717e-06
1.416e-08
d
yr
n .3137776157950747 1.4144e-09 deg/d
Q 2.577261263171918 7.745e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2037  
   data-arc span      17548 days (48.04 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4914  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:21:33  

Additional Information
 Earth MOID = .711501 au 
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456499.5 (2013-Jul-26.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2022057961786424 3.248e-08  
q 1.711085501342273 7.2024e-08 au
tp 2456454.048530890933
(2013-Jun-10.54853089)
2.6453e-05 TDB
node 188.5875158071652 2.8839e-05 deg
peri 108.3021430204661 3.0512e-05 deg
i 6.670357419302213 3.2286e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2037  
   data-arc span      17548 days (48.04 yr)  
   first obs. used      1972-07-13  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4914  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:21:33  

Additional Information
 Jupiter MOID = 2.65597 au 
 T_jup = 3.675 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.054972770072988E-15 -2.334428416332727E-15 3.070902798879599E-13 -1.577149850089182E-14 1.19262434038108E-13 -3.469227527056535E-15
q -2.334428416332727E-15 5.187482127156019E-15 -7.18273655096785E-13 3.563255466684361E-14 -2.77582006242048E-13 7.954819461302848E-15
tp 3.070902798879599E-13 -7.18273655096785E-13 6.997786968469067E-10 -2.155743153087494E-11 2.734111995820948E-10 -1.494035859842062E-12
node -1.577149850089182E-14 3.563255466684361E-14 -2.155743153087494E-11 8.316863471004279E-10 -8.331865725324035E-10 -2.480484328236564E-11
peri 1.19262434038108E-13 -2.77582006242048E-13 2.734111995820948E-10 -8.331865725324035E-10 9.309773233031832E-10 2.414171954115479E-11
i -3.469227527056535E-15 7.954819461302848E-15 -1.494035859842062E-12 -2.480484328236564E-11 2.414171954115479E-11 1.042382173633116E-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-Oct-24 15:16 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin