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4425 Bilk (1967 UQ)
Classification: Main-belt Asteroid          SPK-ID: 2004425
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1625206031204625 1.2299e-08  
a 2.361523198866401 6.4794e-09 au
q 1.977727024303669 2.8483e-08 au
i 3.307267047592874 1.148e-06 deg
node 67.82592741152884 4.4078e-06 deg
peri 52.02320814708418 8.1108e-06 deg
M 199.4664149793285 6.4429e-06 deg
tp 2459791.585294820879
(2022-Jul-31.08529482)
2.4587e-05 TDB
period 1325.521423495999
3.63
5.4553e-06
1.494e-08
d
yr
n .2715912346784387 1.1178e-09 deg/d
Q 2.745319373429132 7.5324e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2323  
   data-arc span      24773 days (67.82 yr)  
   first obs. used      1952-09-15  
   last obs. used      2020-07-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47893  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:19:54  

Additional Information
 Earth MOID = .995714 au 
 Jupiter MOID = 2.33567 au 
 T_jup = 3.531 
[ 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 14.12   n/a E2021B10  
diameter diameter 5.279 km 0.264 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.251 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2008) Minor Planet Bull. 35, 163-167.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.191   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4425 Bilk           Discovered 1967 Oct. 30 by L. Kohoutek at Bergedorf.
Bilk is the district in the city of Düsseldorf where in 1843 Johann Benzenberg established a private observatory that he bequeathed to the city. C. Robert Luther discovered 24 minor planets from the observatory at Bilk during 1852-1890. The observatory was destroyed in 1943.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20070730/MPCPages.arcLast Updated: 2007-08-07

[ show close-approach data ]
Alternate Designations
 1967 UQ = 1983 EQ1 = 1985 VE3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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