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4312 Knacke (1978 WW11)
Classification: Main-belt Asteroid          SPK-ID: 2004312
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1522594962187946 7.6733e-09  
a 2.383671155052404 7.5291e-09 au
q 2.020734585832852 1.7088e-08 au
i 4.429843919415283 4.7057e-07 deg
node 91.17490331276987 6.3195e-06 deg
peri 287.2279541528686 9.8307e-06 deg
M 189.3548687067351 6.4063e-06 deg
tp 2459837.675897851810
(2022-Sep-15.17589785)
2.5317e-05 TDB
period 1344.212527414224
3.68
6.3688e-06
1.744e-08
d
yr
n .2678147931655638 1.2689e-09 deg/d
Q 2.746607724271955 8.6754e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2595  
   data-arc span      33014 days (90.39 yr)  
   first obs. used      1930-11-01  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42921  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:33:08  

Additional Information
 Earth MOID = 1.02683 au 
 Jupiter MOID = 2.72025 au 
 T_jup = 3.517 
[ 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 13.45   n/a E2020-QM5  
diameter diameter 12.384 km 0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.061   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4312 Knacke           Discovered 1978 Nov. 29 by S. J. Bus and C. T. Kowal at Palomar.
Roger F. Knacke (b. 1941) studies interstellar ice and dust, comets and planetary atmospheres. Notable discoveries include the first direct observation of water in a comet and identification of silicate emission in comets and circumstellar sources. He served as Infrared Discipline specialist for the International Halley Watch.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20041126/MPCPages.arcLast Updated: 2004-12-06

Alternate Designations
 1978 WW11 = 1930 VK = 1982 YF5 = 1987 DF5 = 1989 WY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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