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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1200211864098761 2.6192e-08  
a 5.254987374708869 7.7762e-08 au
q 4.62427755542739 1.8563e-07 au
i 2.871984336679064 1.6927e-06 deg
node 24.28885913479728 1.1773e-05 deg
peri 59.24505341411014 2.9468e-05 deg
M 279.188610728435 2.5543e-05 deg
tp 2460188.202185087639
(2023-Aug-31.70218509)
0.00032583 TDB
period 4400.033087374048
12.05
9.7665e-05
2.674e-07
d
yr
n .0818175665617208 1.8161e-09 deg/d
Q 5.885697193990348 8.7095e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2219  
   data-arc span      12903 days (35.33 yr)  
   first obs. used      1985-09-22  
   last obs. used      2021-01-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48248  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 15:53:25  

Additional Information
 Earth MOID = 3.64113 au 
 Jupiter MOID = .0694116 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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