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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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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1864901745485305 3.8443e-08  
a 3.10146091783959 1.5062e-08 au
q 2.523068929916239 1.2326e-07 au
i .72297054842949 4.0548e-06 deg
node 191.3541794867327 0.00029584 deg
peri 194.8849238572219 0.00029602 deg
M 357.3980352817708 1.2188e-05 deg
tp 2459410.919387028939
(2021-Jul-15.41938703)
6.76e-05 TDB
period 1995.022950945719
5.46
1.4533e-05
3.979e-08
d
yr
n .1804490518915313 1.3145e-09 deg/d
Q 3.679852905762941 1.787e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1737  
   data-arc span      11515 days (31.53 yr)  
   first obs. used      1989-12-30  
   last obs. used      2021-07-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50493  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:03:01  

Additional Information
 Earth MOID = 1.52667 au 
 Jupiter MOID = 1.77513 au 
 T_jup = 3.195 
[ 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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