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1640 Nemo (1951 QA)
Classification: Mars-crossing Asteroid          SPK-ID: 2001640
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3429393003538168 4.098e-08  
a 2.289011198725062 4.5939e-09 au
q 1.504019299732237 9.3748e-08 au
i 7.10823431886482 4.2304e-06 deg
node 355.4449600132537 2.8305e-05 deg
peri 354.7933209690306 2.8852e-05 deg
M 305.1800608419808 9.1879e-06 deg
tp 2459193.122205614383
(2020-Dec-09.62220561)
3.268e-05 TDB
period 1264.941097823788
3.46
3.808e-06
1.043e-08
d
yr
n .2845982319804029 8.5675e-10 deg/d
Q 3.074003097717886 6.1693e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2324  
   data-arc span      41517 days (113.67 yr)  
   first obs. used      1906-10-17  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47555  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:34:19  

Additional Information
 Earth MOID = .49845 au 
 Jupiter MOID = 2.36248 au 
 T_jup = 3.510 
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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 13.3   n/a MPO337259  
rotation period rot_per 5.0 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.]
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1640 Nemo (1951 QA)          Discovered 1951-Aug-31 by Arend, S. at Uccle
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1951 QA = A906 UA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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