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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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1695827826322178 2.2354e-08  
a 2.282774275151598 5.5716e-09 au
q 1.895655061450146 5.1802e-08 au
i 3.542014969927634 1.8978e-06 deg
node 49.55845088062438 6.9574e-06 deg
peri 327.0582404063849 8.603e-06 deg
M 117.1075156883111 7.4751e-06 deg
tp 2458790.696985472471
(2019-Nov-03.19698547)
2.5894e-05 TDB
period 1259.774698171962
3.45
4.6121e-06
1.263e-08
d
yr
n .2857653837010618 1.0462e-09 deg/d
Q 2.669893488853051 6.5164e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2468  
   data-arc span      23176 days (63.45 yr)  
   first obs. used      1957-10-01  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4451  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:50:55  

Additional Information
 Earth MOID = .897085 au 
 Jupiter MOID = 2.79296 au 
 T_jup = 3.582 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.59   n/a E2021B10  
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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