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3617 Eicher (1984 LJ)
Classification: Main-belt Asteroid          SPK-ID: 2003617
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1117294254328709 3.5853e-08  
a 2.626695908066831 9.56e-09 au
q 2.333216683471651 9.3353e-08 au
i 14.47684191911166 3.8585e-06 deg
node 181.4823147615011 1.3148e-05 deg
peri 36.11873561093652 1.9988e-05 deg
M 176.491266102979 1.632e-05 deg
tp 2458238.186095987641
(2018-Apr-29.68609599)
6.9067e-05 TDB
period 1554.938164953291
4.26
8.4889e-06
2.324e-08
d
yr
n .2315204605006361 1.2639e-09 deg/d
Q 2.920175132662011 1.0628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2642  
   data-arc span      25730 days (70.44 yr)  
   first obs. used      1950-06-07  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41122  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:13:14  

Additional Information
 Earth MOID = 1.34311 au 
 Jupiter MOID = 2.06441 au 
 T_jup = 3.348 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457208.5 (2015-Jul-05.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1112794493111118 3.5883e-08  
q 2.335195083860928 9.342e-08 au
tp 2456684.554096492815
(2014-Jan-27.05409649)
6.7197e-05 TDB
node 181.5186178171391 1.3136e-05 deg
peri 36.52571824817021 2.0015e-05 deg
i 14.48156365148363 3.8599e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2642  
   data-arc span      25730 days (70.44 yr)  
   first obs. used      1950-06-07  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41122  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:13:14  

Additional Information
 Jupiter MOID = 2.06441 au 
 T_jup = 3.348 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.287597363840795E-15 -3.338499479314607E-15 2.858653128268191E-15 4.133713964867674E-15 -2.709800894058008E-14 -1.70439102974147E-15
q -3.338499479314607E-15 8.727353639744027E-15 9.838731292240586E-14 -1.156500252089288E-14 9.811310502167185E-14 4.924017980042192E-15
tp 2.858653128268191E-15 9.838731292240586E-14 4.515461119633818E-9 -1.85338892162038E-12 1.023911382800885E-9 -4.729450125051139E-13
node 4.133713964867674E-15 -1.156500252089288E-14 -1.85338892162038E-12 1.725603612341473E-10 -1.673434229948358E-10 6.486416559465267E-12
peri -2.709800894058008E-14 9.811310502167185E-14 1.023911382800885E-9 -1.673434229948358E-10 4.005954382053631E-10 -6.281415878731774E-12
i -1.70439102974147E-15 4.924017980042192E-15 -4.729450125051139E-13 6.486416559465267E-12 -6.281415878731774E-12 1.489903820810734E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.4   n/a MPO302084  
diameter diameter 9.193 km 0.090 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.3050 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:
[Loera-Gonzalez, P.; Olguin, L.; Saucedo, J.C.; Nunez-Lopez, R.; Yahia-Keith, N.A. (2019) Minor Planet Bull. 46, 97-98.]
geometric albedo albedo 0.331   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

3617 Eicher (1984 LJ)          Discovered 1984-Jun-02 by Skiff, B. A. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1984 LJ = 1950 LM = 1971 FU 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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