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18865 (1999 RQ204)
Classification: Main-belt Asteroid          SPK-ID: 2018865
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04575793115516772 2.313e-08  
a 3.061427623957292 1.5386e-08 au
q 2.921343029503726 7.5947e-08 au
i 9.58757375633728 3.0377e-07 deg
node 276.7112906195215 5.4723e-06 deg
peri 149.5276784112612 2.3209e-05 deg
M 291.7733314337747 1.8925e-05 deg
tp 2459571.296893237272
(2021-Dec-22.79689324)
0.00010296 TDB
period 1956.520586020504
5.36
1.475e-05
4.038e-08
d
yr
n .1840001084436468 1.3871e-09 deg/d
Q 3.201512218410858 1.609e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1967  
   data-arc span      15445 days (42.29 yr)  
   first obs. used      1978-10-26  
   last obs. used      2021-02-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45685  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:40:14  

Additional Information
 Earth MOID = 1.93982 au 
 Jupiter MOID = 2.00221 au 
 T_jup = 3.211 
[ 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 12.8   n/a MPO449089  
diameter diameter 9.362 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.023 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 0.202   0.036 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18865 (1999 RQ204)          Discovered 1999-Sep-08 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RQ204 = 1978 UL3 = 1984 YN5 = 1984 YW6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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