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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 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4080064108671668 7.5967e-08  
a 2.661346694420412 2.663e-08 AU
q 1.575500181556741 1.9842e-07 AU
i 17.28024803326061 8.4743e-06 deg
node 286.8645042565489 2.742e-05 deg
peri 28.46195186041515 3.0563e-05 deg
M 139.7422192922537 1.7886e-05 deg
tp 2456384.932413951609
(2013-Apr-02.43241395)
7.025e-05 JED
period 1585.808012065148
4.34
2.3802e-05
6.517e-08
d
yr
n .2270136089999844 3.4073e-09 deg/d
Q 3.747193207284083 3.7495e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      411  
   data-arc span      11863 days (32.48 yr)  
   first obs. used      1982-05-01  
   last obs. used      2014-10-23  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50479  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Nov-10 13:01:58  

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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