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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0858285852519708 4.8114e-08  
a 5.057636317035003 7.7842e-08 au
q 4.623546547224901 2.8179e-07 au
i 5.53641307833302 5.3507e-06 deg
node 356.6971722182075 4.8415e-05 deg
peri 279.8955588660813 6.0075e-05 deg
M 328.1155687235454 3.6152e-05 deg
tp 2459568.456091029571
(2021-Dec-19.95609103)
0.0004167 TDB
period 4154.510131358848
11.37
9.5913e-05
2.626e-07
d
yr
n .08665281552274179 2.0005e-09 deg/d
Q 5.491726086845106 8.4523e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1301  
   data-arc span      24404 days (66.81 yr)  
   first obs. used      1953-09-17  
   last obs. used      2020-07-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52285  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:59:32  

Additional Information
 Earth MOID = 3.61117 au 
 Jupiter MOID = .0861573 au 
 T_jup = 2.984 
[ 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 11.87   n/a E2021B10  
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. 2020-October); 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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