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4057 Demophon (1985 TQ)
Classification: Jupiter Trojan          SPK-ID: 2004057
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1203532683975475 2.6057e-08  
a 5.252308183430055 7.6612e-08 au
q 4.620175726923063 1.8476e-07 au
i 2.872766156552339 1.6922e-06 deg
node 24.2807412026306 1.1753e-05 deg
peri 59.54620034131645 2.9139e-05 deg
M 294.9859022569819 2.5307e-05 deg
tp 2460190.515109989409
(2023-Sep-03.01510999)
0.00031979 TDB
period 4396.668561425731
12.04
9.6197e-05
2.634e-07
d
yr
n .08188017699547971 1.7915e-09 deg/d
Q 5.884440639937048 8.5832e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2279  
   data-arc span      13105 days (35.88 yr)  
   first obs. used      1985-09-22  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47712  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 21:30:14  

Additional Information
 Earth MOID = 3.63738 au 
 Jupiter MOID = .0695238 au 
 T_jup = 2.983 
[ 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 10.26   n/a E2021B10  
diameter diameter 45.683 km 6.581 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 29.82 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[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 0.077   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

4057 Demophon (1985 TQ)          Discovered 1985-Oct-15 by Bowell, E. at Flagstaff
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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