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4958 Wellnitz (1991 NT1)
Classification: Main-belt Asteroid          SPK-ID: 2004958
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07816884760557774 3.7109e-08  
a 3.010534362173946 1.6806e-08 au
q 2.775204360405816 1.1398e-07 au
i 9.087541982247339 3.7874e-06 deg
node 252.9788423242966 2.5142e-05 deg
peri 216.2330396068239 3.5811e-05 deg
M 34.27459215112889 2.4036e-05 deg
tp 2458818.850751858880
0.00012766 TDB
period 1907.936031520349
n .1886855712416795 1.58e-09 deg/d
Q 3.245864363942077 1.812e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2678  
   data-arc span      32649 days (89.39 yr)  
   first obs. used      1931-01-13  
   last obs. used      2020-06-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38832  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:15:05  

Additional Information
 Earth MOID = 1.79794 au 
 Jupiter MOID = 1.94337 au 
 T_jup = 3.226 
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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 11.6   n/a MPO502200  
diameter diameter 16.358 km 0.244 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.182   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4958 Wellnitz           Discovered 1991 July 13 by H. E. Holt at Palomar.
Named in honor of Dennis D. Wellnitz (b. 1951), University of Maryland instrument builder, observer, data analyst and all-around physicist. Wellnitz has designed and developed a wide variety of astronomical instrumentation, and he has participated in many major observational programs, including occultations by minor planets and comets and the 1994 cometary collision with Jupiter. His work with the NEAR mission has resulted in improved signal-to-noise spectra from the near-infrared spectrometer, contributing to the mineralogical analysis of the surface of (433) Eros. Wellnitz' thorough, detailed studies and his great patience are particularly appreciated by his colleagues. Name proposed by J. Veverka, based on a suggestion by L. A. McFadden. Citation by McFadden and M. F. A'Hearn.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

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Alternate Designations
 1991 NT1 = 1931 AF1 = 1950 TC3 = 1953 JP = 1961 WA = 1980 NG = 1982 YA3 = 1984 FG2 = 1989 EE8 
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