Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
4021 Dancey (1981 QD2)
Classification: Main-belt Asteroid          SPK-ID: 2004021
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 
[ 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 13.61   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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-May-07 08:00 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin