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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 
[ 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)		 Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1996-Sep-13 23:05 < 00:01 Earth 0.499807320440067 0.49980704448069 0.499807596399701 3.87790612244644 3.87653116438499 2450340.461902944 0.0636881482311904 35.9436659225396 11.5871121916678 -77.4187837283447 1975673.06523965 T 32 CATAB v2.0f-lin.ifort 2021-Feb-24 00:57:08 2021-Feb-24 00:57
2138-Sep-13 05:32 < 00:01 Earth 0.49792526339843 0.497924987097254 0.497925539708578 3.83747216945612 3.83607746597787 2502203.730519271 0.525574963529735 256.71438998447 12.5526316057607 88.7311252245284 1946921.84534064 T 32 CATAB v2.0f-lin.ifort 2021-Feb-24 00:57:08 2021-Feb-24 00:57

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