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2651 Karen (1949 QD)
Classification: Main-belt Asteroid          SPK-ID: 2002651
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3260676704561965 2.4931e-08  
a 2.985067937965229 1.2983e-08 au
q 2.011733789279425 7.8073e-08 au
i 17.77227172123572 6.5191e-07 deg
node 126.3404203149114 1.4807e-06 deg
peri 276.4106567187696 2.5768e-06 deg
M 265.2954137302105 4.9008e-06 deg
tp 2459696.062308017053
(2022-Apr-26.56230802)
2.7947e-05 TDB
period 1883.778155979854
5.16
1.229e-05
3.365e-08
d
yr
n .1911053055038451 1.2468e-09 deg/d
Q 3.958402086651033 1.7216e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2506  
   data-arc span      26132 days (71.55 yr)  
   first obs. used      1949-08-28  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41158  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:04:36  

Additional Information
 Earth MOID = 1.10816 au 
 Jupiter MOID = 1.91952 au 
 T_jup = 3.107 
[ 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 11.88   n/a E2021B10  
diameter diameter 23.545 km 0.350 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.3227 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:
[Bembrick, C.; Allen, B. (2007) Minor Planet Bull. 34, 27.]
geometric albedo albedo 0.044   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

2651 Karen (1949 QD)          Discovered 1949-Aug-28 by Johnson, E. L. at Johannesburg (UO)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1949 QD = 1951 EZ = 1961 BA = 1980 UJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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