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21805 (1999 TQ9)
Classification: Main-belt Asteroid          SPK-ID: 2021805
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .186944475806421 3.9028e-08  
a 3.103415710227802 1.5916e-08 au
q 2.523249287069854 1.2559e-07 au
i .7225453061555668 4.1481e-06 deg
node 191.3672587872899 0.00030446 deg
peri 194.7866091404015 0.00030465 deg
M 322.1275326393651 1.257e-05 deg
tp 2459410.577459862489
(2021-Jul-15.07745986)
7.0671e-05 TDB
period 1996.909386186562
5.47
1.5362e-05
4.206e-08
d
yr
n .1802785857436832 1.3869e-09 deg/d
Q 3.68358213338575 1.8892e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1717  
   data-arc span      11267 days (30.85 yr)  
   first obs. used      1989-12-30  
   last obs. used      2020-11-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50519  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:17:55  

Additional Information
 Earth MOID = 1.52631 au 
 Jupiter MOID = 1.77056 au 
 T_jup = 3.194 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.61   n/a E2021B10  
diameter diameter 8.173 km 2.789 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 309.294 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 0.096   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

21805 (1999 TQ9)          Discovered 1999-Oct-08 by Korlevic, K., Juric, M. at Visnjan
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 TQ9 = 1989 YZ3 = 1997 HX8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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