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305948 (2009 HL18)
Classification: Main-belt Asteroid          SPK-ID: 2305948
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1014196920857723 4.8829e-08  
a 2.807590613359066 2.955e-08 au
q 2.522845637849285 1.4347e-07 au
i 10.50207150409695 4.2271e-06 deg
node 79.62377341340806 3.0513e-05 deg
peri 90.3984963420459 3.8022e-05 deg
M 245.2739544186527 2.6047e-05 deg
tp 2459944.093927192554
(2022-Dec-30.59392719)
0.00012968 TDB
period 1718.300432917304
4.70
2.7128e-05
7.427e-08
d
yr
n .2095093460395617 3.3077e-09 deg/d
Q 3.092335588868848 3.2547e-08 au
  Orbit Determination Parameters
   # obs. used (total)      319  
   data-arc span      6524 days (17.86 yr)  
   first obs. used      2002-12-10  
   last obs. used      2020-10-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60244  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 05:57:06  

Additional Information
 Earth MOID = 1.5566 au 
 Jupiter MOID = 1.96817 au 
 T_jup = 3.290 
[ 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 15.8   n/a MPO437358  

305948 (2009 HL18)          Discovered 2009-Apr-18 by CSS at Catalina
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
2035-Apr-28 15:58 < 00:01 Jupiter 1.99476350755671 1.99476308905466 1.99476392605865 3.24779738522959 3.11431241353884 2464446.165145069 0.707554867524967 105.70268032567 17.0985714962366 -86.3912040059474 2873433.8139375 T 16 CATAB v2.0f-lin.ifort 2021-Apr-14 05:57:06 2021-Apr-14 05:57
2058-Sep-19 15:18 00:01 Jupiter 1.97294477049945 1.97294432924889 1.97294521175002 2.89199950122371 2.73952975565775 2472991.137383095 1.4182559785446 146.208717131957 17.4276312566705 -85.7725702140387 2488072.74568488 T 16 CATAB v2.0f-lin.ifort 2021-Apr-14 05:57:06 2021-Apr-14 05:57
2082-Feb-13 12:37 00:02 Jupiter 1.9690822240015 1.96908177444543 1.96908267355757 2.63098026654813 2.46205910333462 2481539.025357592 2.18823812495478 209.807279198709 17.76676635403 -84.5556707625612 2452144.80439647 T 16 CATAB v2.0f-lin.ifort 2021-Apr-14 05:57:06 2021-Apr-14 05:57
2105-Jul-07 09:52 00:03 Jupiter 1.98720986125186 1.98720932270691 1.98721039979997 2.50083397200608 2.32415498905075 2490082.911259328 3.0086320198108 253.483136754687 17.1941115238613 -84.5426656804927 2620066.28214051 T 16 CATAB v2.0f-lin.ifort 2021-Apr-14 05:57:06 2021-Apr-14 05:57

Alternate Designations
 2009 HL18 = 2002 XG115 = 2004 FV105 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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