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16957 (1998 ON13)
Classification: Main-belt Asteroid          SPK-ID: 2016957
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06795075459544545 1.9578e-08  
a 2.263961172965155 7.6798e-09 au
q 2.110123302887383 4.5205e-08 au
i 9.529880441476079 9.3908e-07 deg
node 317.9733513851279 5.3244e-06 deg
peri 36.82757733938747 1.4938e-05 deg
M 176.9126549990918 1.3845e-05 deg
tp 2458589.053747067773
(2019-Apr-15.55374707)
4.7986e-05 TDB
period 1244.233495092433
3.41
6.331e-06
1.733e-08
d
yr
n .2893347602519381 1.4722e-09 deg/d
Q 2.417799043042927 8.2017e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1940  
   data-arc span      24266 days (66.44 yr)  
   first obs. used      1954-09-28  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4641  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 01:48:14  

Additional Information
 Earth MOID = 1.10806 au 
 Jupiter MOID = 2.88127 au 
 T_jup = 3.596 
[ 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 13.98   n/a E2021B10  
diameter diameter 4.135 km 0.101 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.237   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

16957 (1998 ON13)          Discovered 1998-Jul-26 by Elst, E. W. at La Silla
Reference: 20000913/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 ON13 = 1981 QP4 = 1981 RB4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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