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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .342782895785253 3.6695e-08  
a 2.288776330050422 4.3161e-09 au
q 1.504222951830994 8.4356e-08 au
i 7.108890639671149 4.0946e-06 deg
node 355.4332866170016 2.7949e-05 deg
peri 354.7824197715127 2.8403e-05 deg
M 2.107373910274951 7.7644e-06 deg
tp 2459193.096406671892
(2020-Dec-09.59640667)
2.7264e-05 TDB
period 1264.746415016098
3.46
3.5775e-06
9.795e-09
d
yr
n .2846420402744672 8.0515e-10 deg/d
Q 3.073329708269849 5.7956e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2534  
   data-arc span      41734 days (114.26 yr)  
   first obs. used      1906-10-17  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46087  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:57:01  

Additional Information
 Earth MOID = .496908 au 
 Jupiter MOID = 2.36386 au 
 T_jup = 3.510 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456430.5 (2013-May-18.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3413784123684794 3.6437e-08  
q 1.508093106061524 8.3665e-08 au
tp 2456661.765325242973
(2014-Jan-04.26532524)
2.3739e-05 TDB
node 355.5281896507323 2.8013e-05 deg
peri 354.5093212602539 2.8476e-05 deg
i 7.100257727683453 4.0867e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2534  
   data-arc span      41734 days (114.26 yr)  
   first obs. used      1906-10-17  
   last obs. used      2021-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46087  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:57:01  

Additional Information
 Jupiter MOID = 2.36386 au 
 T_jup = 3.510 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.32762021543648E-15 -3.046712886685761E-15 2.457914050642901E-13 1.010022399511298E-14 2.387834697659081E-14 -9.038625634216213E-16
q -3.046712886685761E-15 6.999834352980199E-15 -5.313900908138191E-13 -2.299501716810435E-14 -4.855111650447627E-14 2.092302286883253E-15
tp 2.457914050642901E-13 -5.313900908138191E-13 5.635397762648186E-10 4.258727522032771E-12 1.297863532726436E-10 -1.343698857707889E-12
node 1.010022399511298E-14 -2.299501716810435E-14 4.258727522032771E-12 7.847312895919946E-10 -7.776918136964929E-10 4.734210391928689E-12
peri 2.387834697659081E-14 -4.855111650447627E-14 1.297863532726436E-10 -7.776918136964929E-10 8.108597958111442E-10 -5.058864555411849E-12
i -9.038625634216213E-16 2.092302286883253E-15 -1.343698857707889E-12 4.734210391928689E-12 -5.058864555411849E-12 1.670137032101749E-11

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 13.32   n/a E2021B10  
rotation period rot_per 5.0 h n/a LCDB (Rev. 2020-October); 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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