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4990 Trombka (1981 ET26)
Classification: Main-belt Asteroid          SPK-ID: 2004990
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1777076260826427 2.9748e-08  
a 2.232625446708977 6.6438e-09 au
q 1.835870878642625 6.5907e-08 au
i 3.886568476080871 3.9359e-06 deg
node 353.3023110372485 4.7455e-05 deg
peri 278.7157964553703 4.8842e-05 deg
M 199.7364293748139 1.2488e-05 deg
tp 2459542.943545758457
(2021-Nov-24.44354576)
4.3037e-05 TDB
period 1218.490738171259
3.34
5.439e-06
1.489e-08
d
yr
n .2954474652308782 1.3188e-09 deg/d
Q 2.629380014775328 7.8245e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2103  
   data-arc span      18107 days (49.57 yr)  
   first obs. used      1971-03-24  
   last obs. used      2020-10-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5019  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:47:04  

Additional Information
 Earth MOID = .824702 au 
 Jupiter MOID = 2.48631 au 
 T_jup = 3.617 
[ 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 14.1   n/a MPO435746  
diameter diameter 4.459 km 0.207 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.927 h n/a LCDB (Rev. 2019-August); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.245   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4990 Trombka           Discovered 1981 Mar. 2 by S. J. Bus at Siding Spring in the course of the U.K. Schmidt-Caltech Asteroid Survey.
A researcher at NASA's Goddard Space Flight Center, Jacob (Jack) Trombka (b. 1930) was instrumental in analyzing \gamma -ray and x-ray measurements of the moon obtained during the Apollo missions. He is the principal investigator for the \gamma -ray and x-ray instruments on the NEAR mission to (433) Eros.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20001013/MPCPages.arcLast Updated: 2013-03-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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