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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457020.5 (2014-Dec-29.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1932267229332812 3.8427e-08  
q 2.499266144171998 1.2405e-07 au
tp 2457416.038191996023
(2016-Jan-28.53819200)
5.7648e-05 TDB
node 191.7507735268942 0.0002963 deg
peri 194.5657096155841 0.00029646 deg
i .7214892335720207 4.0644e-06 deg
  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
 Jupiter MOID = 1.77513 au 
 T_jup = 3.195 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.476611852365891E-15 -4.747012678797548E-15 -5.743575629109519E-13 -2.871460796821506E-15 -6.614712092239486E-14 -8.858080279160991E-18
q -4.747012678797548E-15 1.538942616434861E-14 2.048611269642676E-12 1.000283013651389E-14 2.399833224193494E-13 2.291118064391111E-17
tp -5.743575629109519E-13 2.048611269642676E-12 3.32327189703567E-9 -7.086869610221313E-13 5.789168559449287E-10 1.573046183893246E-13
node -2.871460796821506E-15 1.000283013651389E-14 -7.086869610221313E-13 8.779295154094794E-8 -8.778582325577472E-8 -7.699864535329271E-12
peri -6.614712092239486E-14 2.399833224193494E-13 5.789168559449287E-10 -8.778582325577472E-8 8.788838838509574E-8 7.726632712332505E-12
i -8.858080279160991E-18 2.291118064391111E-17 1.573046183893246E-13 -7.699864535329271E-12 7.726632712332505E-12 1.651897946641099E-11

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

[ show close-approach data ]
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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