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 ]  
12238 Actor (1987 YU1)
Classification: Jupiter Trojan          SPK-ID: 2012238
[ 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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1244827750906242 6.4694e-08  
a 5.172957829026711 1.0437e-07 au
q 4.529013683042695 3.9788e-07 au
i 21.08970135817614 5.4003e-06 deg
node 227.5674976464248 1.6931e-05 deg
peri 177.5511176511443 3.0444e-05 deg
M 312.4716670934052 2.8424e-05 deg
tp 2459567.857649120531
(2021-Dec-19.35764912)		 0.0003459 TDB
period 4297.410432736861
11.77		 0.00013006
3.561e-07		 d
yr
n .0837713794469311 2.5353e-09 deg/d
Q 5.816901975010726 1.1736e-07 au
   Orbit Determination Parameters
   # obs. used (total)      1212  
   data-arc span      12090 days (33.10 yr)  
   first obs. used      1986-11-30  
   last obs. used      2020-01-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50282  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 22:45:28  

Additional Information
 Earth MOID = 3.53875 au 
 Jupiter MOID = .406829 au 
 T_jup = 2.852 
[ 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 10.9   n/a MPO365397  
diameter diameter 30.252 km 4.843 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 7.284 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:
[Duffard, R. Melita, M.; Ortiz, J.; Licandro, J.; et al. (2008) ACM 2008, 8187.]
[Melita, M.D.; Duffard, R.; Williams, I.P.; Jones, D.C.; et al. (2010) Planet. Space Sci. 58, 1035-1039.]
[Ryan, E.L.; Sharkey, B.N.L.; Woodward, C.E. (2017) Astron. J. 153, A116.]
[Szabo, Gy.M.; Pal, A.; Kiss, Cs.; Kiss, L.L.; et al. (2017) Astron. Astrophys. 599, A44.]
geometric albedo albedo 0.092   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

12238 Actor           Discovered 1987 Dec. 17 by E. W. Elst and G. Pizarro at the European Southern Observatory.
Actor was the alleged father of Cteatos and Eurytos, two Greek warriors who beat Nestor in the chariot race.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20030106/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1987 YU1 = 1986 WW8 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-02 13:42 UT
(server date/time)   		NASA Home Page
Site Manager:   Ryan S. Park
Webmaster:   Alan B. Chamberlin