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
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
18282 Ilos (4369 T-3)
Classification: Jupiter Trojan          SPK-ID: 2018282
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 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0753576522800304 6.4935e-08  
a 5.231702125110225 1.0919e-07 au
q 4.837453335533472 3.4946e-07 au
i 8.703070137731345 6.545e-06 deg
node 164.4042854946858 3.3792e-05 deg
peri 212.6838277282974 5.2335e-05 deg
M 222.4997493758455 4.4094e-05 deg
tp 2460669.913530358314
(2024-Dec-25.41353036)
0.00056695 TDB
period 4370.820185424578
11.97
0.00013684
3.746e-07
d
yr
n .08236440409982913 2.5786e-09 deg/d
Q 5.625950914686976 1.1742e-07 au
  Orbit Determination Parameters
   # obs. used (total)      599  
   data-arc span      15442 days (42.28 yr)  
   first obs. used      1977-10-16  
   last obs. used      2020-01-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50921  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:22:36  

Additional Information
 Earth MOID = 3.84234 au 
 Jupiter MOID = .100527 au 
 T_jup = 2.971 
[ 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 12.5   n/a MPO474008  
diameter diameter 15.422 km 1.038 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.089   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

18282 Ilos           Discovered 1977 Oct. 16 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Ilos was the oldest son of Tros, and he built the citadel Ilion, also named Ilios. Ilos was the father of Laomedon and the grandfather of Priam.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010309/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 4369 T-3 = 1988 RF12 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-08 22:01 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin