Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1195260354395736 4.4804e-08  
a 5.257345310007178 8.6822e-08 au
q 4.628955668165184 2.699e-07 au
i 2.871270309018791 5.4329e-06 deg
node 24.30264464304104 0.00010784 deg
peri 59.01364582142931 0.00011148 deg
M 262.9975331322037 3.2058e-05 deg
tp 2460186.892683166562
(2023-Aug-30.39268317)
0.00040991 TDB
period 4402.994890037741
12.05
0.00010907
2.986e-07
d
yr
n .08176252959424038 2.0254e-09 deg/d
Q 5.885734951849171 9.72e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1754  
   data-arc span      12734 days (34.86 yr)  
   first obs. used      1985-09-22  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51774  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:10:54  

Additional Information
 Earth MOID = 3.64614 au 
 Jupiter MOID = .0695792 au 
 T_jup = 2.983 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456562.5 (2013-Sep-27.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1193055021642296 4.4749e-08  
q 4.633009911681694 2.7154e-07 au
tp 2455786.747438191281
(2011-Aug-13.24743819)
0.00035477 TDB
node 24.43996453864879 0.00010765 deg
peri 59.03655913651912 0.00011135 deg
i 2.874173614274628 5.4335e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1754  
   data-arc span      12734 days (34.86 yr)  
   first obs. used      1985-09-22  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51774  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 23:10:54  

Additional Information
 Jupiter MOID = .0695792 au 
 T_jup = 2.983 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.002476870546395E-15 -1.170035169655258E-14 -1.529534775103852E-13 -1.946277437188177E-15 -5.368540475967035E-14 -8.162235613599942E-17
q -1.170035169655258E-14 7.373237474677335E-14 1.177837277890999E-11 1.313953081167059E-14 1.277455760365201E-12 2.316809084121719E-15
tp -1.529534775103852E-13 1.177837277890999E-11 1.258632856474513E-7 -6.555945939776334E-12 1.017916623559921E-8 4.050084329931105E-12
node -1.946277437188177E-15 1.313953081167059E-14 -6.555945939776334E-12 1.158923729456689E-8 -1.157468147514346E-8 -1.32035740685044E-10
peri -5.368540475967035E-14 1.277455760365201E-12 1.017916623559921E-8 -1.157468147514346E-8 1.239985459169491E-8 1.322457060470433E-10
i -8.162235613599942E-17 2.316809084121719E-15 4.050084329931105E-12 -1.32035740685044E-10 1.322457060470433E-10 2.952299041210448E-11

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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Sep-21 19:16 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin