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C/1999 E1 (Li)
Classification: Halley-type Comet*          SPK-ID: 1000249
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2451434.5 (1999-Sep-13.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .7601059555951749 9.9299e-06  
a 16.34065650865052 0.000719 au
q 3.920026178090202 1.1652e-05 au
i 46.88123230278046 4.0276e-05 deg
node 127.8343456351106 2.9684e-05 deg
peri 329.76818734 0.00043524 deg
M 3.345598839103209 0.00025474 deg
tp 2451210.280157959754
(1999-Jan-31.78015796)
0.0025952 TDB
period 24126.96411507765
66.06
1.5924
0.00436
d
yr
n .01492106500771995 9.8481e-07 deg/d
Q 28.76128683921084 0.0012655 au
  Orbit Determination Parameters
   # obs. used (total)      299  
   data-arc span      843 days (2.31 yr)  
   first obs. used      1998-12-06  
   last obs. used      2001-03-28  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      3  
   norm. resid. RMS      .68272  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:29:57  

Additional Information
 Earth MOID = 3.00274 au 
 Jupiter MOID = 1.07969 au 
 T_jup = 1.893 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 10.6   0.6 23 2 parameter fit from 156 observations, autocmod 2.9c
comet total magnitude slope K1 4.5   n/a 23 autocmod 2.9c

Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1999.1   C/1999 E1       
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters ]
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