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4999 MPC (1987 CJ)
Classification: Main-belt Asteroid          SPK-ID: 2004999
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04263183021518013 2.2723e-08  
a 3.013942366428868 1.3792e-08 au
q 2.885452487184934 6.8283e-08 au
i 10.50379521780849 1.915e-06 deg
node 155.7396277365758 2.1268e-06 deg
peri 348.8358126630841 2.3309e-05 deg
M 218.1078637781153 2.5708e-05 deg
tp 2460149.780401455876
(2023-Jul-24.28040146)
0.00013799 TDB
period 1911.176699038871
5.23
1.3118e-05
3.592e-08
d
yr
n .1883656284534254 1.2929e-09 deg/d
Q 3.142432245672802 1.438e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2798  
   data-arc span      20218 days (55.35 yr)  
   first obs. used      1966-02-14  
   last obs. used      2021-06-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41879  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:36:06  

Additional Information
 Earth MOID = 1.89819 au 
 Jupiter MOID = 1.84452 au 
 T_jup = 3.222 
[ 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 12.23   n/a E2021B10  
diameter diameter 12.160 km 0.202 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 102.8 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. (2020) http://www.asu.cas.cz/~ppravec/neo.htm]
geometric albedo albedo 0.189   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4999 MPC (1987 CJ)          Discovered 1987-Feb-02 by Elst, E. W. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1987 CJ = 1966 CZ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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