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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1776667736274057 2.8979e-08  
a 2.232531450048803 6.4889e-09 au
q 1.835884790296919 6.4453e-08 au
i 3.88685201365843 3.9251e-06 deg
node 353.2976750951158 4.6669e-05 deg
peri 278.75444143 4.8072e-05 deg
M 258.7799267655735 1.2514e-05 deg
tp 2459543.077591458468
(2021-Nov-24.57759146)
4.2823e-05 TDB
period 1218.413788729634
3.34
5.312e-06
1.454e-08
d
yr
n .2954661243413455 1.2882e-09 deg/d
Q 2.629178109800688 7.6418e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2179  
   data-arc span      18198 days (49.82 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49786  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:21:42  

Additional Information
 Earth MOID = .822909 au 
 Jupiter MOID = 2.48566 au 
 T_jup = 3.617 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456509.5 (2013-Aug-05.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1772843177273289 2.8895e-08  
q 1.83763908392918 6.4211e-08 au
tp 2457106.102809512945
(2015-Mar-24.60280951)
4.0805e-05 TDB
node 353.4027382590793 4.6688e-05 deg
peri 278.45606000861 4.8099e-05 deg
i 3.885832346822217 3.923e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2179  
   data-arc span      18198 days (49.82 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49786  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:21:42  

Additional Information
 Jupiter MOID = 2.48566 au 
 T_jup = 3.617 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.349291110117167E-16 -1.849038245586709E-15 2.738448385999327E-13 4.932045962349482E-16 6.379330524388694E-14 1.334595936193028E-16
q -1.849038245586709E-15 4.123098499928576E-15 -5.902451515693686E-13 -1.056246681589849E-15 -1.423411981746372E-13 -3.755179618735369E-16
tp 2.738448385999327E-13 -5.902451515693686E-13 1.665038848221221E-9 -1.13276703256729E-12 4.778060278856297E-10 -3.52591232651664E-13
node 4.932045962349482E-16 -1.056246681589849E-15 -1.13276703256729E-12 2.179788541127929E-9 -2.17446544386886E-9 -1.052422162853435E-11
peri 6.379330524388694E-14 -1.423411981746372E-13 4.778060278856297E-10 -2.17446544386886E-9 2.313472120717887E-9 1.03952238076325E-11
i 1.334595936193028E-16 -3.755179618735369E-16 -3.52591232651664E-13 -1.052422162853435E-11 1.03952238076325E-11 1.539025626475296E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.11   n/a E2021B10  
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. 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:
[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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