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101887 (1999 NG42)
Classification: Main-belt Asteroid          SPK-ID: 2101887
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1885848496957196 4.6456e-08  
a 2.323711908422018 9.809e-09 au
q 1.885495047436098 1.092e-07 au
i 2.30154950637173 4.0873e-06 deg
node 314.1856777544361 0.00011916 deg
peri 29.933261930891 0.00011967 deg
M 348.417660550777 1.2167e-05 deg
tp 2459242.126092065100
(2021-Jan-27.62609207)
4.3794e-05 TDB
period 1293.814018241483
3.54
8.1923e-06
2.243e-08
d
yr
n .2782471011477386 1.7618e-09 deg/d
Q 2.761928769407938 1.1659e-08 au
  Orbit Determination Parameters
   # obs. used (total)      789  
   data-arc span      7698 days (21.08 yr)  
   first obs. used      1999-07-14  
   last obs. used      2020-08-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5362  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 15:39:12  

Additional Information
 Earth MOID = .876383 au 
 Jupiter MOID = 2.64351 au 
 T_jup = 3.551 
[ 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 16.04   n/a E2021B55  
diameter diameter 1.798 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 23.285 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.261   0.068 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

101887 (1999 NG42)          Discovered 1999-Jul-14 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Alternate Designations
 1999 NG42 = 2002 JP17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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