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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1010698664939469 4.8817e-08  
a 2.808229329421604 2.9811e-08 au
q 2.524401966012577 1.4355e-07 au
i 10.50208136491981 4.2271e-06 deg
node 79.62914831615944 3.0508e-05 deg
peri 90.53665837457027 3.8074e-05 deg
M 162.1352174254938 2.5377e-05 deg
tp 2458226.355307434832
(2018-Apr-17.85530743)
0.00011476 TDB
period 1718.886826370885
4.71
2.737e-05
7.493e-08
d
yr
n .2094378725096603 3.3349e-09 deg/d
Q 3.092056692830631 3.2823e-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.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60245  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-11 19:09:58  

Additional Information
 Earth MOID = 1.55733 au 
 Jupiter MOID = 1.97002 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 15:57 < 00:01 Jupiter 1.99476359197203 1.99476317347733 1.99476401046673 3.24779592088786 3.11431089144951 2464446.164329543 0.70711226132977 105.687267830917 17.0982344640908 -86.3921426526977 2873428.68759053 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 19:10:00 2020-Nov-11 19:10
2058-Sep-19 15:13 00:01 Jupiter 1.97294481668461 1.97294437543818 1.97294525793092 2.89199245427133 2.73952231930587 2472991.134261484 1.41658681687582 146.084230920151 17.4273009679062 -85.7742086898647 2488060.12254166 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 19:10:00 2020-Nov-11 19:10
2082-Feb-13 12:29 00:02 Jupiter 1.96908273521881 1.96908228572576 1.96908318471187 2.63097143144495 2.46204970645043 2481539.019883593 2.18525765874652 209.525081950158 17.7664136609407 -84.557045613968 2452239.70631638 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 19:10:00 2020-Nov-11 19:10
2105-Jul-07 09:41 00:03 Jupiter 1.98721149326578 1.98721095514139 1.98721203139333 2.50083099076285 2.32415193077859 2490082.903217056 3.00421469415664 253.096045797323 17.1937339407071 -84.543772095872 2620288.95356155 T 15 CATAB v2.0f-lin.ifort 2020-Nov-11 19:10:00 2020-Nov-11 19:10

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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