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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1113664013900453 2.2109e-08  
a 2.627662449132641 9.0552e-09 au
q 2.335029138104986 5.8798e-08 au
i 14.4756714311985 1.1192e-06 deg
node 181.4699825445048 1.4338e-06 deg
peri 36.03586360488867 9.8427e-06 deg
M 268.2340987801606 1.2384e-05 deg
tp 2459793.080743260970
(2022-Aug-01.58074326)
5.447e-05 TDB
period 1555.796496041857
4.26
8.0421e-06
2.202e-08
d
yr
n .2313927309361382 1.1961e-09 deg/d
Q 2.920295760160296 1.0064e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2987  
   data-arc span      25890 days (70.88 yr)  
   first obs. used      1950-06-07  
   last obs. used      2021-04-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39738  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:05:09  

Additional Information
 Earth MOID = 1.34553 au 
 Jupiter MOID = 2.06193 au 
 T_jup = 3.348 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457482.5 (2016-Apr-04.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1114806414988661 2.212e-08  
q 2.334280498607417 5.8773e-08 au
tp 2458240.144588676352
(2018-May-01.64458868)
5.098e-05 TDB
node 181.5194369758118 1.4323e-06 deg
peri 36.53158017021358 9.8317e-06 deg
i 14.48261372022788 1.1196e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2987  
   data-arc span      25890 days (70.88 yr)  
   first obs. used      1950-06-07  
   last obs. used      2021-04-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39738  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 14:05:09  

Additional Information
 Jupiter MOID = 2.06193 au 
 T_jup = 3.348 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.892945078596254E-16 -1.287784089470287E-15 3.076389036918046E-14 1.680802530110397E-15 -1.963106336306655E-14 5.596733824141826E-15
q -1.287784089470287E-15 3.454295118617331E-15 6.366164395490605E-14 -4.326952497035913E-15 7.210212136757448E-14 -1.474600549824465E-14
tp 3.076389036918046E-14 6.366164395490605E-14 2.599003661944084E-9 -1.97275010481501E-12 4.905352738396281E-10 -9.98767905299453E-12
node 1.680802530110397E-15 -4.326952497035913E-15 -1.97275010481501E-12 2.051461072700019E-12 -2.200567183174888E-12 1.683859867198564E-13
peri -1.963106336306655E-14 7.210212136757448E-14 4.905352738396281E-10 -2.200567183174888E-12 9.66614627593435E-11 -2.624660208544991E-12
i 5.596733824141826E-15 -1.474600549824465E-14 -9.98767905299453E-12 1.683859867198564E-13 -2.624660208544991E-12 1.253534377761813E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.48   n/a MPCxxxxx  
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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