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4612 Greenstein (1989 JG)
Classification: Main-belt Asteroid          SPK-ID: 2004612
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1395619423763237 4.8647e-08  
a 2.556727167073962 9.8157e-09 au
q 2.199905357510805 1.2758e-07 au
i 9.617811239298812 3.5919e-06 deg
node 105.4232621789689 2.8011e-05 deg
peri 40.54274099384144 3.0437e-05 deg
M 288.8978332349517 1.2517e-05 deg
tp 2459295.420757659713
5.2182e-05 TDB
period 1493.22415318695
n .2410890550033371 1.3884e-09 deg/d
Q 2.91354897663712 1.1186e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2128  
   data-arc span      23812 days (65.19 yr)  
   first obs. used      1954-11-24  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45743  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:17:31  

Additional Information
 Earth MOID = 1.2224 au 
 Jupiter MOID = 2.13603 au 
 T_jup = 3.404 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.8   n/a MPO416761  
diameter diameter 7.674 km 0.176 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.228   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4612 Greenstein           Discovered 1989 May 2 by E. F. Helin at Palomar.
Named in honor of Jesse Greenstein (b. 1909), an expert in stellar spectroscopy with many discoveries concerning low-luminosity stars, white dwarfs, stellar chemical compositions and stellar evolution. In addition, Greenstein established and guided, during its first two decades, the astronomy department at the California Institute of Technology. As a statesman of science policy he was influential in the early history of radioastronomy in the United States, as well as in the early history of AURA. His friends and colleagues heartily endorse this naming. Citation prepared by J. Cohen.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19960828/MPCPages.arcLast Updated: 2003-09-26

Alternate Designations
 1989 JG = 1972 BU = 1979 YA8 = 1980 BD4 = 1983 XT1 = 1989 JJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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