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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 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4080064129133151 7.5835e-08  
a 2.661346696925654 2.6527e-08 AU
q 1.575500177594318 1.9811e-07 AU
i 17.28024799053462 8.4622e-06 deg
node 286.8645025261031 2.566e-05 deg
peri 28.4619603034444 2.8507e-05 deg
M 139.7422153813576 1.7531e-05 deg
tp 2456384.932430310003
(2013-Apr-02.43243031)
6.8671e-05 JED
period 1585.808014304333
4.34
2.371e-05
6.491e-08
d
yr
n .2270136086794377 3.3942e-09 deg/d
Q 3.74719321625699 3.7351e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      429  
   data-arc span      11980 days (32.80 yr)  
   first obs. used      1982-05-01  
   last obs. used      2015-02-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50057  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Mar-09 14:04:10  

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 LCDB (Rev. 2015-May); 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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