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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3427563620065911 1.3289e-08  
a 2.288830904083111 4.0659e-09 au
q 1.504319550151327 3.0358e-08 au
i 7.108912657302804 6.3998e-07 deg
node 355.4323016929301 3.8375e-06 deg
peri 354.7967510626387 4.6992e-06 deg
M 57.88978649255467 6.7346e-06 deg
tp 2459193.115226084502
(2020-Dec-09.61522608)
2.3277e-05 TDB
period 1264.791650578918
3.46
3.3702e-06
9.227e-09
d
yr
n .2846318599867587 7.5844e-10 deg/d
Q 3.073342258014894 5.4595e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2606  
   data-arc span      41757 days (114.32 yr)  
   first obs. used      1906-10-17  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46294  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:36:31  

Additional Information
 Earth MOID = .497919 au 
 Jupiter MOID = 2.3642 au 
 T_jup = 3.510 
[ show covariance matrix ]

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

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