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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .143104022418438 3.2101e-08  
a 2.32232428393226 7.461e-09 au
q 1.989990337541535 7.6054e-08 au
i 6.587746529668156 3.4407e-06 deg
node 81.33625987412361 3.6159e-05 deg
peri 170.290282757599 3.9836e-05 deg
M 311.1301714256963 1.8783e-05 deg
tp 2459175.977337779697
(2020-Nov-22.47733778)
6.7761e-05 TDB
period 1292.655273071845
3.54
6.2294e-06
1.706e-08
d
yr
n .2784965237827886 1.3421e-09 deg/d
Q 2.654658230322985 8.5287e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2358  
   data-arc span      25121 days (68.78 yr)  
   first obs. used      1951-11-08  
   last obs. used      2020-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45405  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:22:58  

Additional Information
 Earth MOID = .975868 au 
 Jupiter MOID = 2.38028 au 
 T_jup = 3.554 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456837.5 (2014-Jun-29.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1435556804054851 3.2011e-08  
q 1.989194991793457 7.5888e-08 au
tp 2456590.298410929424
(2013-Oct-24.79841093)
6.3975e-05 TDB
node 81.38049425580776 3.6162e-05 deg
peri 170.279743611262 3.9829e-05 deg
i 6.587569820437018 3.4403e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2358  
   data-arc span      25121 days (68.78 yr)  
   first obs. used      1951-11-08  
   last obs. used      2020-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45405  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:22:58  

Additional Information
 Jupiter MOID = 2.38028 au 
 T_jup = 3.554 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.024705559899814E-15 -2.420983138096933E-15 -4.979808810277415E-13 3.922089299024172E-15 -1.285716793802932E-13 5.1707260023114E-16
q -2.420983138096933E-15 5.758933904478318E-15 1.240261817723389E-12 -9.231094971206754E-15 3.21027560415441E-13 -1.085761170362212E-15
tp -4.979808810277415E-13 1.240261817723389E-12 4.092744103413392E-9 -1.917206679351473E-11 1.088660477836754E-9 8.046322988486362E-13
node 3.922089299024172E-15 -9.231094971206754E-15 -1.917206679351473E-11 1.307682610452352E-9 -1.30351495143328E-9 -1.213923955478806E-11
peri -1.285716793802932E-13 3.21027560415441E-13 1.088660477836754E-9 -1.30351495143328E-9 1.586386329521555E-9 1.227607535590011E-11
i 5.1707260023114E-16 -1.085761170362212E-15 8.046322988486362E-13 -1.213923955478806E-11 1.227607535590011E-11 1.1835844893589E-11

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

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