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21619 Johnshopkins (1999 JN136)
Classification: Main-belt Asteroid          SPK-ID: 2021619
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0694500584521017 3.8152e-08  
a 2.264703290332677 7.8792e-09 au
q 2.107419514442405 8.5504e-08 au
i 5.503222205951253 4.214e-06 deg
node 311.6469988122278 3.798e-05 deg
peri 183.3292926450369 4.6535e-05 deg
M 202.3232295518463 2.7237e-05 deg
tp 2459745.731085890540
(2022-Jun-15.23108589)
9.4921e-05 TDB
period 1244.845327328256
3.41
6.4965e-06
1.779e-08
d
yr
n .2891925543654877 1.5092e-09 deg/d
Q 2.421987066222948 8.4264e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1833  
   data-arc span      9458 days (25.89 yr)  
   first obs. used      1995-01-30  
   last obs. used      2020-12-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49645  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:50:37  

Additional Information
 Earth MOID = 1.1213 au 
 Jupiter MOID = 2.59384 au 
 T_jup = 3.608 
[ 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 14.74   n/a E2021B10  
diameter diameter 2.701 km 0.431 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.256 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.201   0.095 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21619 Johnshopkins           Discovered 1999 May 9 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Johns Hopkins (1795-1873) was a wealthy entrepreneur and philanthropist of Baltimore, Maryland. He is best known for his creation, under the terms of his will, of The Johns Hopkins University and its affiliated institutions, including the Applied Physics Laboratory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080718/MPCPages.arcLast Updated: 2008-07-18

[ show close-approach data ]
Alternate Designations
 1999 JN136 = 1995 BV15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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