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21042 (1990 QT7)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021042
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1299358402762464 3.4245e-08  
a 3.241276122330679 1.7572e-08 au
q 2.820118185808309 1.1692e-07 au
i .745897858968449 3.8492e-06 deg
node 239.7883187022473 0.00027758 deg
peri 191.6653914525968 0.00027808 deg
M 13.5710583173498 1.4719e-05 deg
tp 2459316.150405809417
(2021-Apr-11.65040581)
8.7189e-05 TDB
period 2131.436858658977
5.84
1.7333e-05
4.746e-08
d
yr
n .1689001475870597 1.3735e-09 deg/d
Q 3.66243405885305 1.9856e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1948  
   data-arc span      11197 days (30.66 yr)  
   first obs. used      1990-08-16  
   last obs. used      2021-04-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48589  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:29:58  

Additional Information
 Earth MOID = 1.8345 au 
 Jupiter MOID = 1.61031 au 
 T_jup = 3.170 
[ 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 13.47   n/a E2021B10  
diameter diameter 9.630 km 0.344 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.083   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21042 (1990 QT7)          Discovered 1990-Aug-16 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1990 QT7 = 1999 EV1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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