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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 79 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04581114207281159 2.4902e-08  
a 5.1316701721231 5.7153e-08 au
q 4.89658250079716 1.5826e-07 au
i 26.91164791145591 1.4531e-06 deg
node 283.7122816473022 1.8362e-06 deg
peri 359.5398200603996 3.9424e-05 deg
M 348.3151383726434 4.4041e-05 deg
tp 2459534.318526628705
(2021-Nov-15.81852663)
0.00052022 TDB
period 4246.063938846814
11.63
7.0934e-05
1.942e-07
d
yr
n .08478440390555499 1.4164e-09 deg/d
Q 5.366757843449041 5.9771e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2335  
   data-arc span      18362 days (50.27 yr)  
   first obs. used      1971-03-03  
   last obs. used      2021-06-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42052  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:53:09  

Additional Information
 Earth MOID = 3.87986 au 
 Jupiter MOID = .167243 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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