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21820 (1999 TQ34)
Classification: Main-belt Asteroid          SPK-ID: 2021820
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 .2380442170536469 3.0298e-08  
a 2.328805562319502 7.6174e-09 au
q 1.774446865566978 7.0849e-08 au
i 13.15747092623127 4.0938e-06 deg
node 30.51665078699596 1.5232e-05 deg
peri 255.085468851768 1.7462e-05 deg
M 47.33909630088993 1.0495e-05 deg
tp 2459029.806991207365
(2020-Jun-29.30699121)
3.7559e-05 TDB
period 1298.070473816658
3.55
6.3689e-06
1.744e-08
d
yr
n .2773347112206538 1.3607e-09 deg/d
Q 2.883164259072025 9.4307e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1441  
   data-arc span      10338 days (28.30 yr)  
   first obs. used      1992-09-30  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45868  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:33  

Additional Information
 Earth MOID = .810706 au 
 Jupiter MOID = 2.39584 au 
 T_jup = 3.500 
[ 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 14.75   n/a E2021B10  
diameter diameter 4.113 km 1.078 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
geometric albedo albedo 0.177   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

21820 (1999 TQ34)          Discovered 1999-Oct-02 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 TQ34 = 1998 FQ84 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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