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1867 Deiphobus (1971 EA)
Classification: Jupiter Trojan          SPK-ID: 2001867
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 77 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04537694142865151 2.4895e-08  
a 5.129836426762841 5.9063e-08 au
q 4.897060139687061 1.5874e-07 au
i 26.91437490232923 1.4534e-06 deg
node 283.709921805651 1.8363e-06 deg
peri 359.2947329235005 4.1644e-05 deg
M 331.9023079734244 4.6452e-05 deg
tp 2459531.724039812172
(2021-Nov-13.22403981)
0.00054978 TDB
period 4243.7882164699
11.62
7.3292e-05
2.007e-07
d
yr
n .0848298693612609 1.4651e-09 deg/d
Q 5.362612713838621 6.1743e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2291  
   data-arc span      18109 days (49.58 yr)  
   first obs. used      1971-03-03  
   last obs. used      2020-09-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42252  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:03:19  

Additional Information
 Earth MOID = 3.8787 au 
 Jupiter MOID = .162269 au 
 T_jup = 2.783 
[ 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 8.43   n/a E2021B10  
diameter diameter 118.220 km 1.616 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 58.66 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.]
[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.]
geometric albedo albedo 0.060   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.734   0.036 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=6; phase (min.=.50, mean=3.99, max.=9.61) deg.
U-B UB 0.232   0.060 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=5; phase (min.=.50, mean=3.55, max.=9.61) 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

1867 Deiphobus (1971 EA)          Discovered 1971-Mar-03 by Cesco, C. U. and Samuel, A. at El Leoncito
Reference: DISCOVERY.DBLast Updated: 2003-08-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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