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78997 (2121 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2078997
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1861575313054559 3.9701e-08  
a 2.617553782989268 1.5412e-08 au
q 2.130276432688729 1.0767e-07 au
i 14.4974822691722 1.0397e-05 deg
node 6.401451220611376 1.3625e-05 deg
peri 64.57402998843708 3.4986e-05 deg
M 347.6790947215087 3.0054e-05 deg
tp 2459053.439759712176
(2020-Jul-22.93975971)
0.00012931 TDB
period 1546.827369061408
4.23
1.3662e-05
3.74e-08
d
yr
n .2327344390204595 2.0556e-09 deg/d
Q 3.104831133289806 1.8282e-08 au
  Orbit Determination Parameters
   # obs. used (total)      548  
   data-arc span      21949 days (60.09 yr)  
   first obs. used      1960-09-24  
   last obs. used      2020-10-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53609  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 21:24:46  

Additional Information
 Earth MOID = 1.1861 au 
 Jupiter MOID = 2.39411 au 
 T_jup = 3.337 
[ 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 15.7   n/a MPO493428  

78997 (2121 P-L)          Discovered 1960-Sep-24 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 2121 P-L = 1987 AF = 2215 T-3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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