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21660 Velenia (1999 QZ1)
Classification: Main-belt Asteroid          SPK-ID: 2021660
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04361693623994242 4.2551e-08  
a 2.735468338833703 1.3939e-08 au
q 2.616155590712412 1.1674e-07 au
i 4.783155472507004 5.479e-06 deg
node 192.0501109686926 4.3973e-05 deg
peri 238.3474237926546 7.1662e-05 deg
M 197.919824060276 5.737e-05 deg
tp 2459944.500734464237
0.00026538 TDB
period 1652.517112930161
n .2178494837863833 1.6651e-09 deg/d
Q 2.854781086954993 1.4547e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1210  
   data-arc span      9882 days (27.06 yr)  
   first obs. used      1993-08-16  
   last obs. used      2020-09-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52495  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:51:16  

Additional Information
 Earth MOID = 1.63307 au 
 Jupiter MOID = 2.26876 au 
 T_jup = 3.346 
[ 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 14.85   n/a E2021B10  
diameter diameter 5.952 km 0.134 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 15.0738 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.055   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

21660 Velenia           Discovered 1999 Aug. 20 by P. Pravec at Ondřejov.
Miroslav Velen (b. 1972) has developed programs for photometric and astrometric reduction of observations obtained by the minor planet observation program at the Ondřejov Observatory. This object is being named on the occasion of the marriage of Miroslav Velen and Jarmila Karásková in April 2001.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1999 QZ1 = 1994 PJ34 = 1997 EZ50 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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