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JPL Small-Body Database Browser
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18325 (1984 SB2)
Classification: Main-belt Asteroid          SPK-ID: 2018325
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1596495774955358 5.6373e-08  
a 2.550985723439348 1.4847e-08 au
q 2.143721930495112 1.3879e-07 au
i 26.34650607818982 5.9824e-06 deg
node 206.6242080063555 1.0515e-05 deg
peri 162.4202158883578 1.9941e-05 deg
M 280.6236611181461 2.1951e-05 deg
tp 2459328.632337334137
(2021-Apr-24.13233733)
9.2338e-05 TDB
period 1488.197151749643
4.07
1.2992e-05
3.557e-08
d
yr
n .2419034330073508 2.1118e-09 deg/d
Q 2.958249516383583 1.7217e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1207  
   data-arc span      25012 days (68.48 yr)  
   first obs. used      1951-07-14  
   last obs. used      2020-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51596  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 00:44:34  

Additional Information
 Earth MOID = 1.15399 au 
 Jupiter MOID = 2.52329 au 
 T_jup = 3.279 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456544.5 (2013-Sep-09.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1590302565819636 5.6336e-08  
q 2.145152642532822 1.3831e-07 au
tp 2456356.004752896849
(2013-Mar-04.50475290)
8.0964e-05 TDB
node 206.7235376327106 1.0514e-05 deg
peri 162.8982970757711 1.9983e-05 deg
i 26.34934658883417 5.9817e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1207  
   data-arc span      25012 days (68.48 yr)  
   first obs. used      1951-07-14  
   last obs. used      2020-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51596  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 00:44:34  

Additional Information
 Jupiter MOID = 2.52329 au 
 T_jup = 3.279 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.173724531457571E-15 -7.766184475014964E-15 6.126678338999138E-13 5.673941725079572E-15 1.156231265052425E-13 -4.80102219892334E-15
q -7.766184475014964E-15 1.913003273301969E-14 -1.258798421169242E-12 -1.213919540047294E-14 -2.303671273699022E-13 1.121507904141552E-14
tp 6.126678338999138E-13 -1.258798421169242E-12 6.555143135925858E-9 2.129545667338657E-11 1.397162300961829E-9 -1.605335338446873E-11
node 5.673941725079572E-15 -1.213919540047294E-14 2.129545667338657E-11 1.105484640325747E-10 -9.401829754120006E-11 -9.355299026724047E-12
peri 1.156231265052425E-13 -2.303671273699022E-13 1.397162300961829E-9 -9.401829754120006E-11 3.993278839704674E-10 4.854487374757318E-12
i -4.80102219892334E-15 1.121507904141552E-14 -1.605335338446873E-11 -9.355299026724047E-12 4.854487374757318E-12 3.578067412498044E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.6   n/a MPO337413  
diameter diameter 6.550 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.197   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18325 (1984 SB2)          Discovered 1984-Sep-29 by Mrkos, A. at Klet
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1984 SB2 = 1999 KL5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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