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11728 Einer (1998 JC2)
Classification: Main-belt Asteroid          SPK-ID: 2011728
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01586661533616878 3.3538e-08  
a 2.866190604296067 1.2307e-08 au
q 2.820713860497561 9.5896e-08 au
i 3.247602019961092 3.531e-06 deg
node 100.8638857960527 7.6331e-05 deg
peri 154.2590291303012 0.00018024 deg
M 215.8033903050095 0.00016556 deg
tp 2459910.418637097889
(2022-Nov-26.91863710)
0.00081617 TDB
period 1772.376686912625
4.85
1.1415e-05
3.125e-08
d
yr
n .2031170928044075 1.3082e-09 deg/d
Q 2.911667348094575 1.2502e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1917  
   data-arc span      10588 days (28.99 yr)  
   first obs. used      1992-01-26  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49666  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:02:11  

Additional Information
 Earth MOID = 1.80404 au 
 Jupiter MOID = 2.06729 au 
 T_jup = 3.297 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.78   n/a E2021B10  
rotation period rot_per 12.92 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:
[Hahn, G.; Mottola, S.; Sen, A.K.; Harris, A.W. (DLR), et al. (2006) Bull. Astr. Soc. India 34, 393-399.]

11728 Einer           Discovered 1998 May 1 at Haleakala by the JPL Near-Earth Asteroid Tracking program.
Palomar Observatory technician Steve Einer (b. 1955) worked extremely hard removing old and installing new wiring during the upgrade of the 1.2-m Oschin telescope. He completely rewired the rotating portion of the dome. He consistently went above and beyond the call of duty. The name was suggested by R. Thicksten.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010804/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1998 JC2 = 1997 EQ34 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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