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JPL Small-Body Database Browser
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305978 (2009 HL99)
Classification: Main-belt Asteroid          SPK-ID: 2305978
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03813489584944628 8.1196e-08  
a 3.015396919969157 4.7603e-08 au
q 2.900405072481392 2.6723e-07 au
i 9.066690311133565 1.3488e-05 deg
node 217.7016838762392 6.3815e-05 deg
peri 41.98067857671816 0.00026382 deg
M 285.1797788426146 0.00025991 deg
tp 2458997.994976094348
(2020-May-28.49497609)
0.0013831 TDB
period 1912.560390498663
5.24
4.5289e-05
1.24e-07
d
yr
n .1882293504500201 4.4572e-09 deg/d
Q 3.130388767456922 4.9418e-08 au
  Orbit Determination Parameters
   # obs. used (total)      160  
   data-arc span      5449 days (14.92 yr)  
   first obs. used      2004-05-09  
   last obs. used      2019-04-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66316  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 12:17:24  

Additional Information
 Earth MOID = 1.89296 au 
 Jupiter MOID = 1.8788 au 
 T_jup = 3.228 
[ 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 15.7   n/a MPO433971  

305978 (2009 HL99)          Discovered 2009-Apr-21 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

[ 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
1918-Jan-31 21:38 00:07 Jupiter 1.97481808977447 1.9748157811121 1.97482039845918 3.9297486725865 3.81904455313534 2421625.401315583 7.09064760117596 386.161974157986 48.0720330619694 73.8161743103139 1858835.48288873 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
1964-Dec-30 01:56 00:04 Jupiter 1.89846228087255 1.89846116281997 1.89846339892621 3.95873831936645 3.84438346831361 2438759.580605087 3.67911331192265 295.889528906173 47.3214653374357 87.09190070265 1248475.67218874 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
2011-Nov-29 11:00 < 00:01 Jupiter 1.86690082588921 1.86689937281459 1.86690227896361 3.94776117676456 3.83111054557951 2455894.958439855 0.44689350802082 113.979814724479 59.7047973201146 -76.9235007528517 1062551.57289978 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
2058-Oct-27 01:56 00:03 Jupiter 1.89731647486255 1.89731493436296 1.89731801536181 3.90903975931414 3.79311588635965 2473028.580829605 3.1429332570265 242.774005444317 67.5904086082379 -87.2377768481308 976514.06200675 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
2105-Sep-21 20:43 00:07 Jupiter 1.9749894971663 1.97498725639854 1.97499173795135 3.86975855062061 3.7572972146052 2490159.363333928 6.65151901006436 430.574187669367 67.6290469744983 -78.3067830219878 936240.023642189 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
2143-May-12 00:51 00:09 Jupiter 1.9535401316996 1.95353692790162 1.953543335534 3.86576275511225 3.75192682986851 2503905.535260326 9.03673956698591 485.925580891826 56.2940588014545 72.0486788501327 1615878.44555066 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17
2190-Apr-08 21:31 00:12 Jupiter 1.88363918437894 1.88363661515615 1.88364175371437 3.93216166818586 3.81609073535331 2521039.396707703 12.2415760827724 862.481879042361 57.7237929259735 82.6211850222222 1191033.8175605 T 11 CATAB v2.0e-lin.ifort 2019-Jul-14 12:17:26 2019-Jul-14 12:17

Alternate Designations
 2009 HL99 = 2006 UD281 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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