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12513 Niven (1998 HC20)
Classification: Main-belt Asteroid          SPK-ID: 2012513
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1785019651128233 3.2343e-08  
a 2.152168266475306 6.6467e-09 au
q 1.768002001656006 6.8814e-08 au
i 2.236572119174462 3.8321e-06 deg
node 27.60897110317181 8.1639e-05 deg
peri 334.3182608368196 8.276e-05 deg
M 287.5279097247934 1.7755e-05 deg
tp 2459432.656607575949
(2021-Aug-06.15660758)
5.7715e-05 TDB
period 1153.221583784426
3.16
5.3423e-06
1.463e-08
d
yr
n .3121689752099676 1.4461e-09 deg/d
Q 2.536334531294607 7.8331e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1706  
   data-arc span      14484 days (39.66 yr)  
   first obs. used      1980-11-11  
   last obs. used      2020-07-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5255  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 23:24:15  

Additional Information
 Earth MOID = .763963 au 
 Jupiter MOID = 2.91634 au 
 T_jup = 3.682 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.88   n/a E2021B10  
diameter diameter 2.476 km 0.751 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.263   0.171 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

12513 Niven           Discovered 1998 Apr. 27 by P. G. Comba at Prescott.
Ivan M. Niven (1915-1999) was a Canadian-U.S. mathematician who worked mainly in number theory. In 1943 he completed the proof of Waring's conjecture, a conjecture formulated in 1770 to the effect that every positive integer is the sum of a finite number of n -th powers of integers.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20000124/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 1998 HC20 = 1980 VV 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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