Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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
(2019-Jul-27.37388293)
8.5108e-05 TDB
period 1275.346710864264
3.49
6.0168e-06
1.647e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457373.5 (2015-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1067727159940279 3.8629e-08  
q 2.056367947317458 8.7242e-08 au
tp 2457415.454005215747
(2016-Jan-27.95400522)
8.5298e-05 TDB
node 304.8175349245726 8.0973e-05 deg
peri 270.1748259446628 8.411e-05 deg
i 2.785007735926521 4.2001e-06 deg
  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
 Jupiter MOID = 2.4272 au 
 T_jup = 3.582 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.492209492025791E-15 -3.361582517056769E-15 -1.648472497650393E-12 1.11818215973954E-15 -4.67105251760528E-13 8.89373931626102E-16
q -3.361582517056769E-15 7.611157915180836E-15 3.797727123396416E-12 -2.259747860945156E-15 1.073606343007395E-12 -1.938705900244519E-15
tp -1.648472497650393E-12 3.797727123396416E-12 7.275774552634207E-9 8.937172546299371E-12 1.957558686089448E-9 -7.899583069406931E-13
node 1.11818215973954E-15 -2.259747860945156E-15 8.937172546299371E-12 6.55664549775487E-9 -6.546219843799383E-9 1.652565208336191E-10
peri -4.67105251760528E-13 1.073606343007395E-12 1.957558686089448E-9 -6.546219843799383E-9 7.074430336456989E-9 -1.652927994798816E-10
i 8.89373931626102E-16 -1.938705900244519E-15 -7.899583069406931E-13 1.652565208336191E-10 -1.652927994798816E-10 1.76411140600778E-11

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] (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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-24 10:45 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin