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JPL Small-Body Database Browser
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2357 Phereclos (1981 AC)
Classification: Jupiter Trojan          SPK-ID: 2002357
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 49 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04565309972681962 3.766e-08  
a 5.211717798628623 5.5133e-08 au
q 4.97378672621979 2.1137e-07 au
i 2.668655086446388 3.9031e-06 deg
node 179.2480788081733 8.3701e-05 deg
peri 74.13331514054798 9.7717e-05 deg
M 313.0680298072443 5.0654e-05 deg
tp 2459167.047137845508
0.00060878 TDB
period 4345.800288943863
n .082838597281121 1.3145e-09 deg/d
Q 5.449648871037456 5.765e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2641  
   data-arc span      32829 days (89.88 yr)  
   first obs. used      1929-09-29  
   last obs. used      2019-08-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48874  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:24:09  

Additional Information
 Earth MOID = 3.96021 au 
 Jupiter MOID = .230694 au 
 T_jup = 2.996 
[ 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 8.94   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 4
diameter diameter 94.625 km 1.265 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
rotation period rot_per 14.394 h n/a LCDB (Rev. 2019-January); 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:
[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, 265-270.]
[Stephens, R.D.; Coley, D.R. (2017) Minor Planet Bull. 44, 252-257.]
[Stephens, R.D.; Warner, B.D. (2018) Minor Planet Bull. 45, 301-304.]
geometric albedo albedo 0.052   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (  
B-V BV 0.719   0.033 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.67, mean=10.69, max.=10.71) deg.
U-B UB 0.237   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=10.67, mean=10.69, max.=10.71) deg.
Tholen spectral type spec_T D   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

2357 Phereclos           Discovered 1981 Jan. 1 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory.
This Trojan planet is named for the skilled craftsman and builder of the ships that took Paris to Sparta. Phereclos was killed in battle by Meriones.
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
 1981 AC = 1929 SM = 1959 EU = 1965 UQ1 = 1972 JP1 = 1976 SC1 = 1977 RM7 = 1978 VN16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
FirstGov 2019-Dec-15 23:49 UT
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