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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .406661125132377 5.3034e-08  
a 2.661690895312488 7.0653e-09 au
q 1.579284681070108 1.4095e-07 au
i 17.17901632111631 5.5048e-06 deg
node 286.501460021211 1.5879e-05 deg
peri 29.14434207588728 1.6297e-05 deg
M 232.7206047968555 3.997e-06 deg
tp 2459561.277341802376
(2021-Dec-12.77734180)
1.876e-05 TDB
period 1586.115668813831
4.34
6.3154e-06
1.729e-08
d
yr
n .2269695754718974 9.0371e-10 deg/d
Q 3.744097109554868 9.9385e-09 au
  Orbit Determination Parameters
   # obs. used (total)      878  
   data-arc span      13867 days (37.97 yr)  
   first obs. used      1982-05-01  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43886  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:34:27  

Additional Information
 Earth MOID = .584282 au 
 Jupiter MOID = 1.64746 au 
 T_jup = 3.203 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.6   n/a MPO378648  
rotation period rot_per 4.4618 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 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 Bull. 32, 4-7.]
[Behrend, R. (2017) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Aznar Macias, A.; Cornea, R.; Suciu, O. (2018) Minor Planet Bull. 45, 92-96.]
[Benishek, V. (2018) Minor Planet Bull. 45, 82-91.]
[Rowe, B. (2018) Minor Planet Bull. 45, 203-207.]

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

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