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18332 (1987 ON)
Classification: Main-belt Asteroid          SPK-ID: 2018332
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1992574081814474 3.6198e-08  
a 2.598988917509183 1.1429e-08 au
q 2.081121121913998 9.85e-08 au
i 13.9529335991486 3.2189e-06 deg
node 158.1952027154856 1.7213e-05 deg
peri 154.7190166245477 2.0272e-05 deg
M 351.7347194238527 1.2161e-05 deg
tp 2459235.636635095195
(2021-Jan-21.13663510)
5.1782e-05 TDB
period 1530.400392065873
4.19
1.0095e-05
2.764e-08
d
yr
n .2352325586600507 1.5516e-09 deg/d
Q 3.116856713104368 1.3706e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1596  
   data-arc span      12124 days (33.19 yr)  
   first obs. used      1987-07-19  
   last obs. used      2020-09-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51263  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:44  

Additional Information
 Earth MOID = 1.07433 au 
 Jupiter MOID = 2.25619 au 
 T_jup = 3.346 
[ 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 14.19   n/a E2021B10  
diameter diameter 6.502 km 0.500 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 11.9815 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 0.080   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18332 (1987 ON)          Discovered 1987-Jul-19 by Helin, E. F. at Palomar
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1987 ON = 1995 KU1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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