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6490 (1991 NR2)
Classification: Mars-crossing Asteroid          SPK-ID: 2006490
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4060455192018723 6.9804e-08  
a 2.663713184118532 2.7115e-08 au
q 1.58212438126825 1.8198e-07 au
i 17.17168286887326 7.6106e-06 deg
node 286.5493359061695 2.5289e-05 deg
peri 29.01472636127336 2.7751e-05 deg
M 275.2421114961007 1.9599e-05 deg
tp 2457974.358488233402
(2017-Aug-08.85848823)
9.1824e-05 JED
period 1587.923650998371
4.35
2.4246e-05
6.638e-08
d
yr
n .2267111518703422 3.4616e-09 deg/d
Q 3.745301986968815 3.8124e-08 au
  Orbit Determination Parameters
   # obs. used (total)      475  
   data-arc span      12391 days (33.92 yr)  
   first obs. used      1982-05-01  
   last obs. used      2016-04-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49369  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 12:56:00  

Additional Information
 Earth MOID = .586495 au 
 Jupiter MOID = 1.63465 au 
 T_jup = 3.203 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5 mag n/a MPO279583  
rotation period rot_per 4.468 h n/a LCDB (Rev. 2016-February); 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:
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2005) Minor Planet Bul. 32, 4-7.]

6490 (1991 NR2)          Discovered 1991-Jul-12 by Holt, H. E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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