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4021 Dancey (1981 QD2)
Classification: Main-belt Asteroid          SPK-ID: 2004021
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1695827839532518 2.2133e-08  
a 2.282774274885718 5.5462e-09 au
q 1.895655058213732 5.1243e-08 au
i 3.542014972325249 1.8909e-06 deg
node 49.55845097673549 6.9537e-06 deg
peri 327.0582405821548 8.593e-06 deg
M 117.1075156157117 7.4702e-06 deg
tp 2458790.696985798120
(2019-Nov-03.19698580)
2.5872e-05 TDB
period 1259.774697951868
3.45
4.5911e-06
1.257e-08
d
yr
n .2857653837509875 1.0414e-09 deg/d
Q 2.669893491557703 6.4868e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2509  
   data-arc span      23185 days (63.48 yr)  
   first obs. used      1957-10-01  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44183  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:22:09  

Additional Information
 Earth MOID = .897085 au 
 Jupiter MOID = 2.79296 au 
 T_jup = 3.582 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457001.5 (2014-Dec-10.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1706094425848033 2.2175e-08  
q 1.892576547174153 5.1332e-08 au
tp 2457529.873106849564
(2016-May-21.37310685)
2.5301e-05 TDB
node 49.57970028609385 6.9487e-06 deg
peri 326.7987645488549 8.5531e-06 deg
i 3.544759836672416 1.8914e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2509  
   data-arc span      23185 days (63.48 yr)  
   first obs. used      1957-10-01  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44183  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:22:09  

Additional Information
 Jupiter MOID = 2.79296 au 
 T_jup = 3.582 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.917196449431471E-16 -1.133796070616658E-15 8.974104345988591E-14 3.941644390507395E-14 1.693249263345417E-14 -1.779397484505153E-14
q -1.133796070616658E-15 2.634979595324723E-15 -2.070575455595566E-13 -9.033375349020691E-14 -4.130245778631435E-14 4.081240735244034E-14
tp 8.974104345988591E-14 -2.070575455595566E-13 6.401161023973558E-10 3.350497374128804E-11 1.290146115497483E-10 -1.424983026936462E-11
node 3.941644390507395E-14 -9.033375349020691E-14 3.350497374128804E-11 4.828377357095782E-11 -3.835157332265479E-11 -3.006735866512812E-12
peri 1.693249263345417E-14 -4.130245778631435E-14 1.290146115497483E-10 -3.835157332265479E-11 7.3156216718135E-11 -8.97062014786994E-13
i -1.779397484505153E-14 4.081240735244034E-14 -1.424983026936462E-11 -3.006735866512812E-12 -8.97062014786994E-13 3.577368915855365E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.61   n/a MPCxxxxx  
diameter diameter 4.543 km 0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.374   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4021 Dancey (1981 QD2)          Discovered 1981-Aug-30 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1981 QD2 = 1950 SV = 1957 TE = 1957 UF = 1986 AV 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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