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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1117294252212442 3.7866e-08  
a 2.626695908120543 9.8371e-09 au
q 2.333216684075241 9.8036e-08 au
i 14.47684264976139 4.076e-06 deg
node 181.4823140111806 1.3217e-05 deg
peri 36.11873621606367 2.0344e-05 deg
M 176.4912662097627 1.6458e-05 deg
tp 2458238.186095503031
(2018-Apr-29.68609550)
6.9815e-05 TDB
period 1554.938165000986
4.26
8.735e-06
2.392e-08
d
yr
n .2315204604935346 1.3006e-09 deg/d
Q 2.920175132165845 1.0936e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2604  
   data-arc span      25714 days (70.40 yr)  
   first obs. used      1950-06-07  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41303  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:58:48  

Additional Information
 Earth MOID = 1.34311 au 
 Jupiter MOID = 2.06441 au 
 T_jup = 3.348 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457104.5 (2015-Mar-23.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1112268241580015 3.7879e-08  
q 2.335322405650591 9.8039e-08 au
tp 2456684.477601197053
(2014-Jan-26.97760120)
6.8417e-05 TDB
node 181.5196658982439 1.3206e-05 deg
peri 36.51314029197832 2.0392e-05 deg
i 14.48100699121708 4.0774e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2604  
   data-arc span      25714 days (70.40 yr)  
   first obs. used      1950-06-07  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41303  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:58:48  

Additional Information
 Jupiter MOID = 2.06441 au 
 T_jup = 3.348 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.434825457029351E-15 -3.699337845169559E-15 -1.498074275450597E-13 5.026786666323937E-15 -7.254675398296522E-14 -2.678614671605016E-15
q -3.699337845169559E-15 9.611659482759234E-15 4.728402594034424E-13 -1.391564141134277E-14 2.097670696197961E-13 7.469784199118067E-15
tp -1.498074275450597E-13 4.728402594034424E-13 4.680858481335435E-9 -8.925721111202203E-13 1.070927941994091E-9 -1.288670345004617E-12
node 5.026786666323937E-15 -1.391564141134277E-14 -8.925721111202203E-13 1.743917243261692E-10 -1.689104588615997E-10 4.717720204241606E-12
peri -7.254675398296522E-14 2.097670696197961E-13 1.070927941994091E-9 -1.689104588615997E-10 4.158355361155612E-10 -4.73644069295779E-12
i -2.678614671605016E-15 7.469784199118067E-15 -1.288670345004617E-12 4.717720204241606E-12 -4.73644069295779E-12 1.662520577880628E-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. 2019-August); 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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