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JPL Small-Body Database Browser
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20553 Donaldhowk (1999 RQ113)
Classification: Main-belt Asteroid          SPK-ID: 2020553
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1066668689033702 5.3597e-08  
a 2.301842252166041 9.0111e-09 au
q 2.056311946418007 1.2532e-07 au
i 2.785040206075355 4.5301e-06 deg
node 304.7905741302761 0.00010204 deg
peri 270.5494183068198 0.00010475 deg
M 334.0237251551733 2.5565e-05 deg
tp 2458692.542018291557
(2019-Jul-28.04201829)
9.0694e-05 TDB
period 1275.591930825277
3.49
7.4904e-06
2.051e-08
d
yr
n .2822219169786444 1.6572e-09 deg/d
Q 2.547372557914074 9.9723e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1299  
   data-arc span      10290 days (28.17 yr)  
   first obs. used      1991-03-09  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52045  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:53:30  

Additional Information
 Earth MOID = 1.05183 au 
 Jupiter MOID = 2.43087 au 
 T_jup = 3.582 
[ 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 14.8   n/a MPO337431  
diameter diameter 3.210 km 0.979 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.255 h n/a LCDB (Rev. 2019-January); 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 0.171   0.140 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20553 Donaldhowk           Discovered 1999 Sept. 9 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Donald Howk mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. He teaches at the Keystone Junior High School, San Antonio, Texas.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041028/MPCPages.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 RQ113 = 1991 EH4 = 1998 FS16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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