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JPL Small-Body Database Browser
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15420 Aedouglass (1998 HQ31)
Classification: Main-belt Asteroid          SPK-ID: 2015420
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 .2723217254666127 4.5469e-08  
a 2.642384569504415 1.2238e-08 au
q 1.92280584419062 1.2089e-07 au
i 3.293739252021055 5.2072e-06 deg
node 305.8464521984187 8.8133e-05 deg
peri 358.963651224443 8.8655e-05 deg
M 239.4678799988484 9.1719e-06 deg
tp 2459125.782289451745
(2020-Oct-03.28228945)
4.0778e-05 TDB
period 1568.889887615199
4.30
1.0899e-05
2.984e-08
d
yr
n .2294616103028239 1.5941e-09 deg/d
Q 3.36196329481821 1.5571e-08 au
  Orbit Determination Parameters
   # obs. used (total)      846  
   data-arc span      8529 days (23.35 yr)  
   first obs. used      1995-11-24  
   last obs. used      2019-04-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56792  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 19:32:08  

Additional Information
 Earth MOID = .906903 au 
 Jupiter MOID = 1.9007 au 
 T_jup = 3.338 
[ 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 15.1   n/a MPO431676  

15420 Aedouglass           Discovered 1998 Apr. 28 by Spacewatch at Kitt Peak.
Andrew Ellicott Douglass (1867-1962) was an American astronomer and developer of dendochronology. For Percival Lowell, he sited Lowell Observatory. Later he directed the Steward Observatory at the University of Arizona and in 1923 dedicated the 0.9-m telescope, which became the Spacewatch telescope in 1983.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040713/MPCPages.arcLast Updated: 2004-07-14

[ show close-approach data ]
Alternate Designations
 1998 HQ31 = 1999 TW119 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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