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17376 (1981 EQ4)
Classification: Main-belt Asteroid          SPK-ID: 2017376
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1373001785875624 3.711e-08  
a 3.117724826118846 2.0116e-08 au
q 2.689660650705851 1.0957e-07 au
i 8.496761576478667 4.9983e-06 deg
node 228.3165326516475 2.6232e-05 deg
peri 273.7338570580567 3.1846e-05 deg
M 118.4085781130377 1.7632e-05 deg
tp 2458539.143290345114
(2019-Feb-24.64329035)
9.8496e-05 TDB
period 2010.736209064769
5.51
1.946e-05
5.328e-08
d
yr
n .1790389004669303 1.7328e-09 deg/d
Q 3.54578900153184 2.2878e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1093  
   data-arc span      16198 days (44.35 yr)  
   first obs. used      1976-05-03  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51374  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:02:12  

Additional Information
 Earth MOID = 1.71915 au 
 Jupiter MOID = 1.60994 au 
 T_jup = 3.186 
[ 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 14.28   n/a E2021B10  
diameter diameter 8.981 km 0.160 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 136.172 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.055   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17376 (1981 EQ4)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EQ4 = 1976 JQ5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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