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JPL Small-Body Database Browser
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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 ]

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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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08574215194002957 4.9816e-08  
a 5.058152007993069 9.0615e-08 au
q 4.624455169987962 2.8307e-07 au
i 5.536287183599486 6.1946e-06 deg
node 356.6955265910516 5.6705e-05 deg
peri 279.7334369555304 7.645e-05 deg
M 310.9243966191131 5.7562e-05 deg
tp 2459566.934098048533
(2021-Dec-18.43409805)
0.0006699 TDB
period 4155.145556027736
11.38
0.00011166
3.057e-07
d
yr
n .08663956416105797 2.3282e-09 deg/d
Q 5.491848845998176 9.8384e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1089  
   data-arc span      24241 days (66.37 yr)  
   first obs. used      1953-09-17  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53656  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:25:55  

Additional Information
 Earth MOID = 3.61393 au 
 Jupiter MOID = .085511 au 
 T_jup = 2.984 
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Orbital Elements at Epoch 2456429.5 (2013-May-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08382526504972188 4.9937e-08  
q 4.645403497397775 2.8471e-07 au
tp 2455412.972815804344
(2010-Aug-04.47281580)
0.00064748 TDB
node 356.6991469141929 5.6708e-05 deg
peri 280.247232299174 7.7057e-05 deg
i 5.532187447942066 6.1903e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1089  
   data-arc span      24241 days (66.37 yr)  
   first obs. used      1953-09-17  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53656  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:25:55  

Additional Information
 Jupiter MOID = .085511 au 
 T_jup = 2.984 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.493742122625514E-15 -1.358464016434173E-14 2.009694528108686E-12 -9.987823991754776E-17 1.40936945945591E-13 1.536774258519004E-15
q -1.358464016434173E-14 8.106163296641568E-14 2.522651103327119E-12 1.334965251039452E-14 4.828734580130183E-13 -6.463473060009702E-15
tp 2.009694528108686E-12 2.522651103327119E-12 4.19229774575518E-7 1.42328270637948E-10 3.383807185726049E-8 -2.821945798370183E-12
node -9.987823991754776E-17 1.334965251039452E-14 1.42328270637948E-10 3.215809165010687E-9 -3.188723820739298E-9 -1.978584537738564E-11
peri 1.40936945945591E-13 4.828734580130183E-13 3.383807185726049E-8 -3.188723820739298E-9 5.937787033089673E-9 1.951665498744194E-11
i 1.536774258519004E-15 -6.463473060009702E-15 -2.821945798370183E-12 -1.978584537738564E-11 1.951665498744194E-11 3.831985265765465E-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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