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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04468832625362574 3.1105e-08  
a 5.196305516605057 8.2278e-08 au
q 4.964091320365495 2.1944e-07 au
i 17.77823227326664 1.9542e-06 deg
node 86.57203117135192 7.558e-06 deg
peri 320.8431052206499 3.1774e-05 deg
M 325.767289321696 3.352e-05 deg
tp 2459611.914156997592
(2022-Feb-01.41415700)
0.0004042 TDB
period 4326.537209132015
11.85
0.00010276
2.813e-07
d
yr
n .08320742029911324 1.9763e-09 deg/d
Q 5.428519712844619 8.5955e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2323  
   data-arc span      25271 days (69.19 yr)  
   first obs. used      1951-12-05  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42909  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:33:03  

Additional Information
 Earth MOID = 3.99284 au 
 Jupiter MOID = .101292 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 9.48   n/a E2021B10 IRAS observations used: 7
diameter diameter 76.435 km 0.786 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 8.180 h n/a LCDB (Rev. 2020-October); 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] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
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 ]
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