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 ]  
19725 (1999 WT4)
Classification: Jupiter Trojan          SPK-ID: 2019725
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07305889011996557 5.435e-08  
a 5.155414250206334 9.8978e-08 au
q 4.778765406977605 3.1343e-07 au
i 9.954251491412105 6.1218e-06 deg
node 43.24021227373917 3.2713e-05 deg
peri 34.4904611509553 5.5796e-05 deg
M 260.276672360419 4.7925e-05 deg
tp 2460184.871748874302
(2023-Aug-28.37174887)
0.00058796 TDB
period 4275.567609774757
11.71
0.00012313
3.371e-07
d
yr
n .08419934681350187 2.4248e-09 deg/d
Q 5.532063093435063 1.0621e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1312  
   data-arc span      14775 days (40.45 yr)  
   first obs. used      1979-05-19  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53201  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 04:20:02  

Additional Information
 Earth MOID = 3.7993 au 
 Jupiter MOID = .0124857 au 
 T_jup = 2.965 
[ 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 10.8   n/a MPO337424  
diameter diameter 31.668 km 0.457 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 56.70 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:
[French, L.M.; Stephens, R.D.; Coley, D.; Wasserman, L.; Sieben, J. (2015) Icarus 254, 1-17.]
geometric albedo albedo 0.092   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

19725 (1999 WT4)          Discovered 1999-Nov-28 by Kobayashi, T. at Oizumi
Reference: 20001211/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 WT4 = 1992 GZ3 = 1998 VR15 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Mar-31 09:33 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin