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17394 (1981 ER42)
Classification: Main-belt Asteroid          SPK-ID: 2017394
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 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09902806644166839 3.6994e-08  
a 3.084958000325105 1.7319e-08 au
q 2.779460574499154 1.1425e-07 au
i 1.554697575643311 4.2998e-06 deg
node 12.19950779539392 0.00014236 deg
peri 24.88448307225819 0.00014392 deg
M 264.803693605642 2.2368e-05 deg
tp 2459723.847203547914
(2022-May-24.34720355)
0.0001252 TDB
period 1979.120833709315
5.42
1.6666e-05
4.563e-08
d
yr
n .1818989492042684 1.5318e-09 deg/d
Q 3.390455426151056 1.9034e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1327  
   data-arc span      15293 days (41.87 yr)  
   first obs. used      1978-10-03  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55402  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:02:28  

Additional Information
 Earth MOID = 1.78557 au 
 Jupiter MOID = 2.00453 au 
 T_jup = 3.219 
[ 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 13.98   n/a E2021B10  

17394 (1981 ER42)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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