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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 ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .159462194969472 4.2134e-08  
a 2.550768881114139 1.1377e-08 au
q 2.144017676471854 1.0774e-07 au
i 26.34652612720416 4.8455e-06 deg
node 206.5928132599969 1.0287e-05 deg
peri 162.4345556453108 1.9004e-05 deg
M 329.0013999703004 1.8694e-05 deg
tp 2459328.628184256111
(2021-Apr-24.12818426)
7.7563e-05 TDB
period 1488.007403173263
4.07
9.9552e-06
2.726e-08
d
yr
n .2419342801872348 1.6186e-09 deg/d
Q 2.957520085756424 1.3191e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1557  
   data-arc span      25377 days (69.48 yr)  
   first obs. used      1951-07-14  
   last obs. used      2021-01-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46889  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:37:44  

Additional Information
 Earth MOID = 1.15294 au 
 Jupiter MOID = 2.52514 au 
 T_jup = 3.279 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.62   n/a E2021B10  
diameter diameter 6.550 km 0.190 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.63782 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
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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