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8149 Ruff (1985 JN1)
Classification: Main-belt Asteroid          SPK-ID: 2008149
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .143104021642175 3.7333e-08  
a 2.322324284289151 8.9903e-09 au
q 1.989990339650088 8.5958e-08 au
i 6.587744676480597 4.0214e-06 deg
node 81.33626273809854 3.6869e-05 deg
peri 170.2902813957966 4.0772e-05 deg
M 311.1301697074352 2.093e-05 deg
tp 2459175.977343989923
(2020-Nov-22.47734399)
7.5688e-05 TDB
period 1292.655273369824
3.54
7.5063e-06
2.055e-08
d
yr
n .2784965237185902 1.6172e-09 deg/d
Q 2.654658228928214 1.0277e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1894  
   data-arc span      24897 days (68.16 yr)  
   first obs. used      1951-11-08  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49633  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 21:08:28  

Additional Information
 Earth MOID = .975868 au 
 Jupiter MOID = 2.38028 au 
 T_jup = 3.554 
[ 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 13.4   n/a MPO358710  
diameter diameter 4.091 km 0.132 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.554   0.116 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8149 Ruff           Discovered 1985 May 11 by C. Shoemaker and E. Shoemaker at Palomar.
Jan Ruff (b. 1949) is the very capable, warm-spirited and enthusiastic chief of the Office of Public Affairs for Goddard Space Center, NASA. Steve Ruff (b. 1949) is an imaginative, creative and knowledgeable middle-school teacher with a wonderful dry sense of humor.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000320/MPCPages.arcLast Updated: 2013-03-29

[ show close-approach data ]
Alternate Designations
 1985 JN1 = 1992 HC 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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