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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074364422604595 3.8615e-08  
a 2.3014852618013 7.1954e-09 au
q 2.054221873358486 8.7236e-08 au
i 2.785851207290863 4.2021e-06 deg
node 304.7761319620226 8.0948e-05 deg
peri 270.2114545085709 8.4063e-05 deg
M 198.9732560362655 2.4099e-05 deg
tp 2459966.935092106604
(2023-Jan-22.43509211)
8.5714e-05 TDB
period 1275.295196955772
3.49
5.9806e-06
1.637e-08
d
yr
n .2822875839722032 1.3238e-09 deg/d
Q 2.548748650244113 7.9684e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1696  
   data-arc span      10930 days (29.92 yr)  
   first obs. used      1991-03-09  
   last obs. used      2021-02-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4896  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:23:54  

Additional Information
 Earth MOID = 1.05027 au 
 Jupiter MOID = 2.42613 au 
 T_jup = 3.582 
[ 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 14.85   n/a E2021B10  
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. 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 0.171   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

Alternate Designations
 1999 RQ113 = 1991 EH4 = 1998 FS16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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