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JPL Small-Body Database Browser
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20545 Karenhowell (1999 RS104)
Classification: Main-belt Asteroid          SPK-ID: 2020545
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 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1207624385090492 7.6196e-08  
a 2.305787336793824 1.0504e-08 au
q 2.027334835319315 1.7819e-07 au
i 6.257609778544786 4.2281e-06 deg
node 265.5128731612582 5.566e-05 deg
peri 312.341085294926 6.0032e-05 deg
M 334.4932035365681 2.512e-05 deg
tp 2458691.110957014259
(2019-Jul-26.61095701)
8.9398e-05 TDB
period 1278.872655446921
3.50
8.7391e-06
2.393e-08
d
yr
n .2814979259011466 1.9236e-09 deg/d
Q 2.584239838268332 1.1773e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1043  
   data-arc span      8695 days (23.81 yr)  
   first obs. used      1995-07-21  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47528  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 02:53:17  

Additional Information
 Earth MOID = 1.02525 au 
 Jupiter MOID = 2.41729 au 
 T_jup = 3.570 
[ 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 14.9   n/a MPO474035  
diameter diameter 3.106 km 0.435 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 28.299 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 0.241   0.078 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

20545 Karenhowell           Discovered 1999 Sept. 8 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Karen Howell mentored a finalist in the 2004 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. She teaches at the Hillel Academy, Fairfield, Connecticut.
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 RS104 = 1998 DP15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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