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2594 Acamas (1978 TB)
Classification: Jupiter Trojan          SPK-ID: 2002594
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08574220266190896 5.0096e-08  
a 5.058151988116475 9.2023e-08 au
q 4.624454895256655 2.8337e-07 au
i 5.536278682257963 6.2126e-06 deg
node 356.6955851386458 5.7141e-05 deg
peri 279.733365503442 7.7797e-05 deg
M 310.9244083854633 5.9541e-05 deg
tp 2459566.933958901682
(2021-Dec-18.43395890)
0.00069325 TDB
period 4155.145531535548
11.38
0.00011339
3.104e-07
d
yr
n .08663956467174827 2.3644e-09 deg/d
Q 5.491849080976296 9.9914e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1063  
   data-arc span      23967 days (65.62 yr)  
   first obs. used      1953-09-17  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54149  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:20:02  

Additional Information
 Earth MOID = 3.61393 au 
 Jupiter MOID = .0855108 au 
 T_jup = 2.984 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456396.5 (2013-Apr-14.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08385832758851323 5.0244e-08  
q 4.645424505119513 2.8506e-07 au
tp 2455413.261331967232
(2010-Aug-04.76133197)
0.00066663 TDB
node 356.6988831157919 5.7145e-05 deg
peri 280.2736766400415 7.8401e-05 deg
i 5.532071756989613 6.2083e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1063  
   data-arc span      23967 days (65.62 yr)  
   first obs. used      1953-09-17  
   last obs. used      2019-05-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54149  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 18:20:02  

Additional Information
 Jupiter MOID = .0855108 au 
 T_jup = 2.984 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.524459229763642E-15 -1.365663017348773E-14 2.86051705852646E-12 4.02604727546578E-16 2.084748412652909E-13 1.558988255927719E-15
q -1.365663017348773E-14 8.12605211077924E-14 7.602849875679777E-13 1.165257269227695E-14 3.440921574443031E-13 -6.488253137883395E-15
tp 2.86051705852646E-12 7.602849875679777E-13 4.443991824367324E-7 1.545410669634304E-10 3.584286819969933E-8 -1.97294528288657E-12
node 4.02604727546578E-16 1.165257269227695E-14 1.545410669634304E-10 3.265533884855051E-9 -3.237255056455189E-9 -2.294149037784811E-11
peri 2.084748412652909E-13 3.440921574443031E-13 3.584286819969933E-8 -3.237255056455189E-9 6.146749207214541E-9 2.272627173374126E-11
i 1.558988255927719E-15 -6.488253137883395E-15 -1.97294528288657E-12 -2.294149037784811E-11 2.272627173374126E-11 3.85424695484459E-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 11.9   n/a MPO473800  
diameter diameter 25.874 km 0.594 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  
rotation period rot_per 25.954 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.060   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[jupiter_trojans] (http://adsabs.harvard.edu/abs/2012ApJ...759...49G)  

2594 Acamas (1978 TB)          Discovered 1978-Oct-04 by Kowal, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1978 TB = 1977 RR 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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