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 ]  
21602 Ialmenus (1998 YW1)
Classification: Jupiter Trojan          SPK-ID: 2021602
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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0602530961669254 5.5607e-08  
a 5.209275244465491 1.1883e-07 au
q 4.895400282200728 3.0955e-07 au
i 7.939107970692993 5.828e-06 deg
node 309.3083258745656 4.5085e-05 deg
peri 194.4223866060315 7.4121e-05 deg
M 225.6887144019085 6.2262e-05 deg
tp 2460620.721495744804
(2024-Nov-06.22149574)
0.00078931 TDB
period 4342.745554632809
11.89
0.00014859
4.068e-07
d
yr
n .0828968668486586 2.8364e-09 deg/d
Q 5.523150206730254 1.2599e-07 au
  Orbit Determination Parameters
   # obs. used (total)      694  
   data-arc span      13531 days (37.05 yr)  
   first obs. used      1983-10-08  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52002  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:56:00  

Additional Information
 Earth MOID = 3.90873 au 
 Jupiter MOID = .351891 au 
 T_jup = 2.977 
[ 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 12.1   n/a MPO302197  
diameter diameter 16.353 km 1.174 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  
geometric albedo albedo 0.151   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2011ApJ...742...40G)  

21602 Ialmenus           Discovered 1998 Dec. 17 by M. Tichy and Z. Moravec at Klet.
Ialmenus was one of the Achaean leaders and one of those who entered Troy in the Wooden Horse. He was the son of Ares and Astyoche. He is counted among the Argonauts and the suitors of Helen. The citation was prepared by J. Ticha.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

Alternate Designations
 1998 YW1 = 1989 AD5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-27 12:58 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin