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2608 Seneca (1978 DA)
Classification: Amor [NEO]          SPK-ID: 2002608
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5708204249878576 1.4072e-07  
a 2.51667410150128 1.9758e-08 au
q 1.080105121326385 3.5375e-07 au
i 14.67173412946713 1.7935e-05 deg
node 167.3379899590386 4.0278e-05 deg
peri 37.3766584259375 0.00011708 deg
M 289.5198317558535 0.00018955 deg
tp 2459485.998169516777
(2021-Sep-28.49816952)
0.00076929 TDB
period 1458.273207720042
3.99
1.7173e-05
4.702e-08
d
yr
n .2468673209479362 2.9071e-09 deg/d
Q 3.953243081676175 3.1036e-08 au
  Orbit Determination Parameters
   # obs. used (total)      74  
   data-arc span      15663 days (42.88 yr)  
   first obs. used      1978-02-17  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      1  
   norm. resid. RMS      .63701  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 14:00:48  

Additional Information
 Earth MOID = .13248 au 
 Jupiter MOID = 1.1375 au 
 T_jup = 3.172 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.52   n/a PDS3 (MPC 17266)  
diameter diameter 0.9 km n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
rotation period rot_per 8. 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:
[Degewij, J. (1978) Messenger 13, 5; IAUC 3193.]
geometric albedo albedo 0.21   n/a Hazards due to Comets and Asteroids (1994), Ed. T. Gehrels, pp.540-543  
B-V BV 0.826   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=22.10, mean=23.28, max.=26.12) deg.
U-B UB 0.454   0.052 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=4; phase (min.=22.22, mean=23.41, max.=26.12) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

2608 Seneca (1978 DA)          Discovered 1978-Feb-17 by Schuster, H.-E. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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