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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1195260530451027 4.7312e-08  
a 5.257345337167911 8.9903e-08 au
q 4.628955599521157 2.7635e-07 au
i 2.871273203128536 5.6044e-06 deg
node 24.30269372356352 0.00011036 deg
peri 59.01360120212577 0.000114 deg
M 262.997525290951 3.2794e-05 deg
tp 2460186.892788263121
(2023-Aug-30.39278826)
0.0004202 TDB
period 4402.994924158165
12.05
0.00011294
3.092e-07
d
yr
n .08176252896063252 2.0973e-09 deg/d
Q 5.885735074814666 1.0065e-07 au
  Orbit Determination Parameters
   # obs. used (total)      1666  
   data-arc span      12680 days (34.72 yr)  
   first obs. used      1985-09-22  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52613  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 16:04:49  

Additional Information
 Earth MOID = 3.64614 au 
 Jupiter MOID = .0695789 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 10.1   n/a MPO416754  
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. 2019-August); 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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