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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1074259154883467 3.8579e-08  
a 2.301547238407866 7.2388e-09 au
q 2.054301419282225 8.7136e-08 au
i 2.785858685985963 4.2021e-06 deg
node 304.7761622246802 8.0946e-05 deg
peri 270.2710207580884 8.4064e-05 deg
M 143.5730382854928 2.408e-05 deg
tp 2458691.873882927244
8.5108e-05 TDB
period 1275.346710864264
n .2822761817890594 1.3317e-09 deg/d
Q 2.548793057533507 8.0164e-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-Apr-13 03:23:45  

Additional Information
 Earth MOID = 1.0487 au 
 Jupiter MOID = 2.4272 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 14.85   n/a E2021B10  
diameter diameter 3.210 km 0.979 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
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] (  

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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2152-Dec-03 05:25 00:02 Vesta 0.0236916381651629 0.0236905712879939 0.0236927242366016 3.73014993286489 3.73014858646741 2507398.725583555 1.49824189960496 1204.36944594089 25.4208525298484 -87.7726789948723 138638.326764102 T 33 CATAB v2.0f-lin.ifort 2021-Apr-13 03:23:50 2021-Apr-13 03:23

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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