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11455 Richardstarr (1981 EN4)
Classification: Main-belt Asteroid          SPK-ID: 2011455
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0413972332332453 3.6608e-08  
a 3.068282053241655 1.8767e-08 au
q 2.941263665458229 1.0898e-07 au
i 9.89115882399585 4.1186e-06 deg
node 251.7981688668402 2.1116e-05 deg
peri 202.1055053336834 5.2003e-05 deg
M 195.9563406737302 4.9354e-05 deg
tp 2459895.036970652756
(2022-Nov-11.53697065)
0.00027203 TDB
period 1963.095134292838
5.37
1.8011e-05
4.931e-08
d
yr
n .1833838787082941 1.6825e-09 deg/d
Q 3.19530044102508 1.9544e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2279  
   data-arc span      14422 days (39.49 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-07-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41736  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 00:24:38  

Additional Information
 Earth MOID = 1.95996 au 
 Jupiter MOID = 2.01481 au 
 T_jup = 3.208 
[ 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 13.1   n/a MPO347616  
diameter diameter 5.132 km 0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 17.414 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.558   0.111 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

11455 Richardstarr           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring.
Richard Starr (b. 1950) of the Catholic University of America is an expert in planetary X-ray, gamma-ray, and neutron spectroscopy, including their application to asteroid missions.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2017-03-12Last Updated: 2017-04-19

Alternate Designations
 1981 EN4 = 1987 KR1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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