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884 Priamus (A917 SU)
Classification: Jupiter Trojan          SPK-ID: 2000884
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1232715112355663 4.3772e-08  
a 5.183376402273251 6.2298e-08 au
q 4.544413759862254 2.6023e-07 au
i 8.915354236208726 4.3243e-06 deg
node 301.561134641866 2.818e-05 deg
peri 335.5280356170961 3.4315e-05 deg
M 324.7322896712768 2.085e-05 deg
tp 2459422.772026074857
(2021-Jul-27.27202607)
0.00025068 TDB
period 4310.399738741765
11.80
7.7709e-05
2.128e-07
d
yr
n .08351893601986121 1.5057e-09 deg/d
Q 5.822339044684247 6.9978e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2674  
   data-arc span      37477 days (102.61 yr)  
   first obs. used      1917-11-08  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4263  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:22:27  

Additional Information
 Earth MOID = 3.53053 au 
 Jupiter MOID = .416818 au 
 T_jup = 2.961 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456573.5 (2013-Oct-08.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1221767413953901 4.3952e-08  
q 4.548115436320998 2.6179e-07 au
tp 2455126.857354211038
(2009-Oct-22.35735421)
0.00025167 TDB
node 301.5619334495839 2.8196e-05 deg
peri 336.1789090819298 3.4374e-05 deg
i 8.913165746440894 4.3232e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2674  
   data-arc span      37477 days (102.61 yr)  
   first obs. used      1917-11-08  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4263  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:22:27  

Additional Information
 Jupiter MOID = .416818 au 
 T_jup = 2.961 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.931749659604274E-15 -1.131095824931623E-14 4.289008551916927E-13 -4.150799558022294E-15 4.061941686124631E-14 5.582635534058783E-17
q -1.131095824931623E-14 6.853358203996651E-14 -4.504234897634133E-12 4.111712999754989E-14 -3.113056996005318E-13 -2.082415567200163E-15
tp 4.289008551916927E-13 -4.504234897634133E-12 6.333776392465654E-8 -2.114668214487006E-11 4.991465992354358E-9 5.770797545765027E-12
node -4.150799558022294E-15 4.111712999754989E-14 -2.114668214487006E-11 7.950086770868794E-10 -7.859595863787113E-10 2.05912470843138E-11
peri 4.061941686124631E-14 -3.113056996005318E-13 4.991465992354358E-9 -7.859595863787113E-10 1.181581901479294E-9 -2.003992251507775E-11
i 5.582635534058783E-17 -2.082415567200163E-15 5.770797545765027E-12 2.05912470843138E-11 -2.003992251507775E-11 1.869019935179054E-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 8.7   n/a MPO473774  
diameter diameter 101.093 km 0.539 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 6.8605 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[French, L.M.; Stephens, R.D.; Lederer, S.M. (2011) Minor Planet Bull. 38, 2-3.]
[Mottola, S.; Di Martino, M.; Erikson, A.; Gonano-Beurer, M.; et al. (2011) Astron. J. 141, A170.]
[Shevchenko, V.G.; Belskya, I.N.; Slyusarev, L.G.; Krugly, Yu.N.; et al. (2012) Icarus 217, 202-208.]
[Stephens, R.D.; Coley, D.R.; French, L.M. (2015) Minor Planet Bull. 42, 216-224.]
[Stephens, R.D.; Coley, D.R.; Warner, B.D.; French, L.M. (2016) Minor Planet Bull. 43, 323-331.]
[Stephens, R.D. (2017) Minor Planet Bull. 44, 123-125.]
geometric albedo albedo 0.044   0.002 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
B-V BV 0.718   0.044 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=8; phase (min.=.98, mean=2.85, max.=6.08) deg.
U-B UB 0.229   0.051 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=7; phase (min.=.98, mean=2.96, max.=6.08) 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

884 Priamus (A917 SU)          Discovered 1917-Sep-22 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A917 SU = 1929 XX = 1938 KE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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