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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .272569715822491 4.2546e-08  
a 2.643096028452519 1.1698e-08 au
q 1.922668095085662 1.1424e-07 au
i 3.293918625669289 5.0012e-06 deg
node 305.8437649644364 8.2659e-05 deg
peri 358.8627906101907 8.3162e-05 deg
M 17.21363304143938 8.5094e-06 deg
tp 2459125.452214828291
(2020-Oct-02.95221483)
3.6998e-05 TDB
period 1569.523562909428
4.30
1.042e-05
2.853e-08
d
yr
n .2293689680788655 1.5228e-09 deg/d
Q 3.363523961819377 1.4887e-08 au
  Orbit Determination Parameters
   # obs. used (total)      919  
   data-arc span      9150 days (25.05 yr)  
   first obs. used      1995-11-24  
   last obs. used      2020-12-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55103  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 00:57:28  

Additional Information
 Earth MOID = .905544 au 
 Jupiter MOID = 1.90089 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 15.13   n/a E2021B10  

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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
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
1919-Jun-16 18:39 00:02 Jupiter 1.88844833186973 1.8884479446709 1.88844871906952 1.4336680734232 1.07626555927167 2422126.277331490 1.67757650514778 341.224787587888 56.1356986181258 -60.8332618001373 3831245.30037698 T 23 CATAB v2.0f-lin.ifort 2021-Apr-13 00:57:33 2021-Apr-13 00:57
1966-Sep-15 03:23 < 00:01 Jupiter 1.88654076356787 1.88654047172287 1.88654105541404 1.45213531635621 1.10033328181657 2439383.640935072 0.837886615066653 269.872269788209 55.4875987906623 -56.9678824840163 3728383.4945141 T 23 CATAB v2.0f-lin.ifort 2021-Apr-13 00:57:33 2021-Apr-13 00:57
2013-Dec-14 06:52 < 00:01 Jupiter 1.89748898021977 1.89748867599834 1.8974892844414 1.49978618861158 1.1647214587007 2456640.785905374 0.199372800154647 190.591012300658 52.7461096328528 -53.5181912454811 3185464.62205727 T 23 CATAB v2.0f-lin.ifort 2021-Apr-13 00:57:33 2021-Apr-13 00:57
2061-Mar-12 06:00 < 00:01 Jupiter 1.92481886099502 1.92481838657032 1.9248193354194 1.59254437473583 1.28689214035982 2473895.750139093 0.921654623580756 123.169117270236 48.6823182439352 -51.9348345416675 2261452.7250747 T 23 CATAB v2.0f-lin.ifort 2021-Apr-13 00:57:33 2021-Apr-13 00:57
2108-Jun-07 19:56 00:02 Jupiter 1.97088911575407 1.97088821393726 1.97089001756976 1.7553938421446 1.49059523052236 2491149.330569049 1.79004729608252 76.5811609262591 50.1823013019906 -59.0616861668675 1203662.58795927 T 23 CATAB v2.0f-lin.ifort 2021-Apr-13 00:57:33 2021-Apr-13 00:57

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