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17378 (1981 EM5)
Classification: Main-belt Asteroid          SPK-ID: 2017378
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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04549936080797313 3.8811e-08  
a 3.099005358221182 2.2489e-08 au
q 2.958002595281634 1.1606e-07 au
i 8.153083250926619 4.3695e-06 deg
node 271.8279693306143 3.9087e-05 deg
peri 183.9816204637883 7.7494e-05 deg
M 229.9810421375548 6.9063e-05 deg
tp 2460116.174471500335
(2023-Jun-20.67447150)
0.00038591 TDB
period 1992.654102136548
5.46
2.1691e-05
5.939e-08
d
yr
n .1806635680593053 1.9666e-09 deg/d
Q 3.240008121160729 2.3512e-08 au
  Orbit Determination Parameters
   # obs. used (total)      948  
   data-arc span      14790 days (40.49 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-08-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54481  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 21:56:24  

Additional Information
 Earth MOID = 1.97495 au 
 Jupiter MOID = 1.90973 au 
 T_jup = 3.205 
[ 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 14.01   n/a MPO636325  
diameter diameter 6.867 km 0.307 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 18.4114 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 0.113   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17378 (1981 EM5)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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