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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457181.5 (2015-Jun-08.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1233358308077961 3.3456e-08  
q 2.844486342904759 1.1305e-07 au
tp 2457168.253891230862
(2015-May-25.75389123)
9.9812e-05 TDB
node 240.5355958104525 0.00028434 deg
peri 189.0495969788659 0.00028491 deg
i .7314777037205623 3.8308e-06 deg
  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
 Jupiter MOID = 1.61031 au 
 T_jup = 3.170 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.119334641773748E-15 -3.750029312673422E-15 -2.174768648326747E-13 4.894941762854079E-17 -1.656669152686849E-14 -2.631101398307117E-17
q -3.750029312673422E-15 1.278134997314256E-14 2.998868785327973E-13 1.282853859419306E-14 -3.322978050848576E-14 2.436304073031049E-16
tp -2.174768648326747E-13 2.998868785327973E-13 9.962460149729307E-9 5.513351601874672E-12 1.8101868752447E-9 2.573862818295136E-13
node 4.894941762854079E-17 1.282853859419306E-14 5.513351601874672E-12 8.085058265818668E-8 -8.084377669201004E-8 -2.366282763411652E-10
peri -1.656669152686849E-14 -3.322978050848576E-14 1.8101868752447E-9 -8.084377669201004E-8 8.117505650321415E-8 2.366336436859474E-10
i -2.631101398307117E-17 2.436304073031049E-16 2.573862818295136E-13 -2.366282763411652E-10 2.366336436859474E-10 1.467491002233636E-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 13.47   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

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