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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4080064118822178 7.5977e-08  
a 2.66134669478692 2.6637e-08 AU
q 1.575500179072309 1.9844e-07 AU
i 17.28024804980548 8.4744e-06 deg
node 286.8645069591641 2.7542e-05 deg
peri 28.46194980677409 3.0709e-05 deg
M 139.7422189483315 1.7909e-05 deg
tp 2456384.932415339435
(2013-Apr-02.43241534)
7.0354e-05 JED
period 1585.808012392732
4.34
2.3808e-05
6.518e-08
d
yr
n .2270136089530896 3.4082e-09 deg/d
Q 3.74719321050153 3.7505e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      403  
   data-arc span      11841 days (32.42 yr)  
   first obs. used      1982-05-01  
   last obs. used      2014-10-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50708  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Oct-09 14:07:21  

Additional Information
 Earth MOID = .580795 AU 
 T_jup = 3.202 
[ 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 Asteroid Lightcurve DataBase (Rev. 2014-Mar-01) 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 (675)
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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