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20996 (1986 PB)
Classification: Inner Main-belt Asteroid          SPK-ID: 2020996
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04969890051782915 1.7073e-08  
a 1.911883798676946 5.0123e-09 au
q 1.816865275964851 3.3216e-08 au
i 26.77305925909668 1.246e-06 deg
node 151.4722907630029 1.8626e-06 deg
peri 179.5990222529428 2.2977e-05 deg
M 349.9112852477459 2.1092e-05 deg
tp 2459227.559764248312
(2021-Jan-13.05976425)
5.6592e-05 TDB
period 965.5853464600993
2.64
3.7971e-06
1.04e-08
d
yr
n .372830844336841 1.4661e-09 deg/d
Q 2.006902321389041 5.2614e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1721  
   data-arc span      13074 days (35.79 yr)  
   first obs. used      1984-12-22  
   last obs. used      2020-10-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4318  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:47  

Additional Information
 Earth MOID = .804443 au 
 Jupiter MOID = 3.17201 au 
 T_jup = 3.803 
[ 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 14.87   n/a E2021B10  
diameter diameter 2.957 km 0.086 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 43.6 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:
[Warner, B.D. (2012) Minor Planet Bull. 39, 245-252.]
geometric albedo albedo 0.320   0.056 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20996 (1986 PB)          Discovered 1986-Aug-04 by Helin, E. F. at Palomar
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1986 PB = 1994 RZ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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