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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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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5713304448434781 1.5376e-07  
a 2.515689528604088 2.8298e-08 au
q 1.078399511138635 3.8336e-07 au
i 14.67781523640742 2.2325e-05 deg
node 167.3641910916199 4.058e-05 deg
peri 37.3687472988139 0.00012287 deg
M 141.342851903501 0.00020435 deg
tp 2458028.290137320605
(2017-Oct-01.79013732)
0.00082194 TDB
period 1457.417533256098
3.99
2.4591e-05
6.733e-08
d
yr
n .2470122609240907 4.1678e-09 deg/d
Q 3.952979546069542 4.4465e-08 au
  Orbit Determination Parameters
   # obs. used (total)      71  
   data-arc span      14778 days (40.46 yr)  
   first obs. used      1978-02-17  
   last obs. used      2018-08-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      1  
   norm. resid. RMS      .59421  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Aug-05 06:22:28  

Additional Information
 Earth MOID = .131765 au 
 Jupiter MOID = 1.13987 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. 2019-January); 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

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