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 ]  
1208 Troilus (1931 YA)
Classification: Jupiter Trojan          SPK-ID: 2001208
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 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09176709829582544 4.3222e-08  
a 5.253479662819505 6.3672e-08 au
q 4.771383078206427 2.5708e-07 au
i 33.53919229547099 4.9851e-06 deg
node 48.54798431488045 6.4815e-06 deg
peri 295.2970228984893 3.3439e-05 deg
M 255.5930092103427 3.727e-05 deg
tp 2460276.045890457170
(2023-Nov-27.54589046)
0.00047118 TDB
period 4398.139598618427
12.04
7.9958e-05
2.189e-07
d
yr
n .08185279069202023 1.4881e-09 deg/d
Q 5.735576247432582 6.9515e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2595  
   data-arc span      32309 days (88.46 yr)  
   first obs. used      1931-12-31  
   last obs. used      2020-06-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41258  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:27:43  

Additional Information
 Earth MOID = 3.89047 au 
 Jupiter MOID = .00472569 au 
 T_jup = 2.658 
[ 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 9.0   n/a MPO473779 IRAS observations used: 10
diameter diameter 100.477 km 1.097 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 56.17 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:
[Molnar, L.A.; Haegert, M.J.; Hoogenboom, K.M. (2008) Minor Planet Bull. 35, 82-84.]
geometric albedo albedo 0.041   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.693   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.10, mean=6.26, max.=9.41) deg.
U-B UB 0.314   0.093 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.10, mean=6.26, max.=9.41) deg.
Tholen spectral type spec_T FCU   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1208 Troilus (1931 YA)          Discovered 1931-Dec-31 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1931 YA = 1965 WK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Aug-13 05:57 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin