Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
4990 Trombka (1981 ET26)
Classification: Main-belt Asteroid          SPK-ID: 2004990
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1776667633515727 2.6677e-08  
a 2.232531447703864 5.9512e-09 au
q 1.835884811309718 6.0154e-08 au
i 3.886852099017157 3.9222e-06 deg
node 353.2976979135256 4.3785e-05 deg
peri 278.7544181372936 4.5275e-05 deg
M 258.7799293282748 1.2197e-05 deg
tp 2459543.077582245311
(2021-Nov-24.57758225)
4.1623e-05 TDB
period 1218.413786809993
3.34
4.8719e-06
1.334e-08
d
yr
n .2954661248068597 1.1814e-09 deg/d
Q 2.629178084098011 7.0086e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2304  
   data-arc span      18262 days (50.00 yr)  
   first obs. used      1971-03-24  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48716  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:59:28  

Additional Information
 Earth MOID = .822909 au 
 Jupiter MOID = 2.48566 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 14.14   n/a MPCxxxxx  
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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jun-23 00:36 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin