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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1297061442295362 3.4261e-08  
a 3.240418566777781 1.7621e-08 au
q 2.820116368791235 1.1697e-07 au
i .7460714228101335 3.8513e-06 deg
node 239.7902721958667 0.00027921 deg
peri 191.6679319309995 0.00027972 deg
M 340.4551342062001 1.4807e-05 deg
tp 2459316.172543852693
(2021-Apr-11.67254385)
8.7571e-05 TDB
period 2130.59103225868
5.83
1.7378e-05
4.758e-08
d
yr
n .1689671994997356 1.3782e-09 deg/d
Q 3.660720764764327 1.9906e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1871  
   data-arc span      11112 days (30.42 yr)  
   first obs. used      1990-08-16  
   last obs. used      2021-01-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48625  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:50:39  

Additional Information
 Earth MOID = 1.8342 au 
 Jupiter MOID = 1.61126 au 
 T_jup = 3.171 
[ 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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