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18338 (1989 EP2)
Classification: Main-belt Asteroid          SPK-ID: 2018338
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09818814341517153 3.6989e-08  
a 2.778732489716095 1.218e-08 au
q 2.505893905503455 1.0498e-07 au
i 7.896476235390352 3.5319e-06 deg
node 281.6771810991119 2.6305e-05 deg
peri 263.5420916297888 3.164e-05 deg
M 291.8047491380997 1.7976e-05 deg
tp 2459520.994193672070
(2021-Nov-02.49419367)
8.4754e-05 TDB
period 1691.876021624918
4.63
1.1124e-05
3.046e-08
d
yr
n .2127815486469555 1.399e-09 deg/d
Q 3.051571073928736 1.3376e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2039  
   data-arc span      11705 days (32.05 yr)  
   first obs. used      1989-03-04  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47077  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:42:39  

Additional Information
 Earth MOID = 1.52259 au 
 Jupiter MOID = 2.00239 au 
 T_jup = 3.313 
[ 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 13.77   n/a MPCxxxxx  
diameter diameter 5.011 km 0.686 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 7.108 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.280   0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18338 (1989 EP2)          Discovered 1989-Mar-04 by Helin, E. F. at Palomar
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 EP2 = 1998 DJ3 = 1999 LH20 = 2000 QQ126 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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