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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 7 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .4086836882910678 7.6089e-08  
a 2.658520627090399 2.6469e-08 AU
q 1.572026611813212 1.9888e-07 AU
i 17.29649715941923 8.4792e-06 deg
node 286.8652778433043 2.7727e-05 deg
peri 28.31361380897079 3.0928e-05 deg
M 94.50074483666425 1.7271e-05 deg
tp 2456384.885004057482
(2013-Apr-02.38500406)
7.0278e-05 JED
period 1583.282743410256
4.33
2.3646e-05
6.474e-08
d
yr
n .2273756860537687 3.3958e-09 deg/d
Q 3.745014642367586 3.7287e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      395  
   data-arc span      11611 days (31.79 yr)  
   first obs. used      1982-05-01  
   last obs. used      2014-02-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50718  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-16 13:34:34  

Additional Information
 Earth MOID = .575302 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 Asteroid Lightcurve DataBase (Rev. 2013-Sep-12) 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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