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JPL Small-Body Database Browser
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2260 Neoptolemus (1975 WM1)
Classification: Jupiter Trojan          SPK-ID: 2002260
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04443220916029915 5.8515e-08  
a 5.195762364864076 1.0198e-07 au
q 4.964903164721225 3.7042e-07 au
i 17.77828646124591 5.4297e-06 deg
node 86.56994951460133 1.7491e-05 deg
peri 320.6794753168469 6.879e-05 deg
M 309.2594521626446 6.9502e-05 deg
tp 2459610.212358145730
0.00084002 TDB
period 4325.85887003113
n .08322046807722354 2.4502e-09 deg/d
Q 5.426621565006927 1.0651e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1771  
   data-arc span      24830 days (67.98 yr)  
   first obs. used      1951-12-05  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46688  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:32:55  

Additional Information
 Earth MOID = 3.99441 au 
 Jupiter MOID = .0998786 au 
 T_jup = 2.903 
[ 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 9.3   n/a MPO502174 IRAS observations used: 7
diameter diameter 76.435 km 0.786 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
rotation period rot_per 8.180 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Angeli, C.A.; Lazzaro, D.; Florczak, A.; Betzler, A.S.; Carvano, J.M. (1999) Planet. Space Sci. 47, 699-714.]
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2016) Minor Planet Bull. 43, 15-22.]
[Stephens, R.D.; Coley, D.R.; Warner, B.D.; French, L.M. (2016) Minor Planet Bull. 43, 323-331.]
geometric albedo albedo 0.057   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
Tholen spectral type spec_T DTU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

2260 Neoptolemus           Discovered 1975 Nov. 26 at the Purple Mountain Observatory.
The son of Achilles and Deidameia, Neoptolemus was brought to Troy by Odysseus in the last year of the Trojan War. He has one of the warriors in the wooden horse and was responsible for the death 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: MPC 6208Last Updated: 2006-03-21

Alternate Designations
 1975 WM1 = 1951 XK 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2020-Feb-26 17:16 UT
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