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JPL Small-Body Database Browser
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4297 Eichhorn (1938 HE)
Classification: Main-belt Asteroid          SPK-ID: 2004297
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1927284528696651 3.3972e-08  
a 2.335412269019079 8.7998e-09 au
q 1.885311875598197 7.834e-08 au
i 5.860393008916817 3.6665e-06 deg
node 121.7039736959253 3.9955e-05 deg
peri 181.1533775062209 4.1562e-05 deg
M 161.9138493483723 1.3955e-05 deg
tp 2458014.192755943423
(2017-Sep-17.69275594)
4.8928e-05 TDB
period 1303.598232701084
3.57
7.3679e-06
2.017e-08
d
yr
n .2761587051664469 1.5608e-09 deg/d
Q 2.78551266243996 1.0496e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2081  
   data-arc span      29596 days (81.03 yr)  
   first obs. used      1938-04-19  
   last obs. used      2019-04-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50516  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:32:21  

Additional Information
 Earth MOID = .869192 au 
 Jupiter MOID = 2.44667 au 
 T_jup = 3.536 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.1   n/a MPO332859  
diameter diameter 3.668 km 0.093 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.105 h n/a LCDB (Rev. 2019-January); 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:
[Salvaggio, F.; Banfi, M.; Marchini, A.; Papini, R. (2018) Minor Planet Bull. 45, 171-173.]
geometric albedo albedo 1.000   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Cb   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4297 Eichhorn           Discovered 1938 Apr. 19 by W. Dieckvoss at Bergedorf.
Named in honor of Heinrich Karl Eichhorn (b. 1927), Austrian-American astronomer, educator and scholar, innovator in the astronomy of stellar positions and motions. He developed the central-overlap and other astrometric reduction methods that greatly improve their rigor, increasing the precision of stellar parallaxes and proper motions and thus also of the distance scale of the universe. Name proposed by A. R. Upgren.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19961224/MPCPages.arcLast Updated: 2003-09-26

[ show close-approach data ]
Alternate Designations
 1938 HE = 1942 LL = 1971 SH = 1988 GN 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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