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17769 (1998 EM9)
Classification: Main-belt Asteroid          SPK-ID: 2017769
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06252100147037561 1.8755e-08  
a 2.390865537201125 8.5727e-09 au
q 2.241386229434303 4.518e-08 au
i 7.650970651434314 7.8563e-07 deg
node 27.91544631571838 4.9798e-06 deg
peri 75.72702350981113 1.0667e-05 deg
M 157.9676287542583 6.7754e-06 deg
tp 2458803.988542080100
(2019-Nov-16.48854208)
2.5636e-05 TDB
period 1350.302758440401
3.70
7.2625e-06
1.988e-08
d
yr
n .2666068759392892 1.4339e-09 deg/d
Q 2.540344844967947 9.1087e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1804  
   data-arc span      26034 days (71.28 yr)  
   first obs. used      1950-03-17  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47846  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:28:21  

Additional Information
 Earth MOID = 1.27274 au 
 Jupiter MOID = 2.53511 au 
 T_jup = 3.517 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457249.5 (2015-Aug-15.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06177171918988815 1.8818e-08  
q 2.243444534765883 4.5388e-08 au
tp 2457455.815709947764
(2016-Mar-08.31570995)
2.79e-05 TDB
node 27.93713485687752 4.9805e-06 deg
peri 76.4151637860013 1.0707e-05 deg
i 7.650960721356393 7.8528e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      1804  
   data-arc span      26034 days (71.28 yr)  
   first obs. used      1950-03-17  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47846  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:28:21  

Additional Information
 Jupiter MOID = 2.53511 au 
 T_jup = 3.517 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.541309091074118E-16 -8.404086608335134E-16 5.568483865515411E-14 -1.193814776714739E-14 4.678218556086471E-14 -1.769209350687111E-15
q -8.404086608335134E-16 2.060078144800955E-15 -2.220728853961894E-13 2.87560876654889E-14 -1.391966224065827E-13 4.136143456203162E-15
tp 5.568483865515411E-14 -2.220728853961894E-13 7.784250904821945E-10 -3.886389448236448E-11 2.653956138858172E-10 -2.389600789407909E-12
node -1.193814776714739E-14 2.87560876654889E-14 -3.886389448236448E-11 2.480560180391737E-11 -3.598585243518302E-11 1.325611251840324E-12
peri 4.678218556086471E-14 -1.391966224065827E-13 2.653956138858172E-10 -3.598585243518302E-11 1.146481133433151E-10 -2.3446583284355E-12
i -1.769209350687111E-15 4.136143456203162E-15 -2.389600789407909E-12 1.325611251840324E-12 -2.3446583284355E-12 6.166569183972561E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.31   n/a MPCxxxxx  
rotation period rot_per 22.1031 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.]

17769 (1998 EM9)          Discovered 1998-Mar-15 by Kobayashi, T. at Oizumi
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 EM9 = 1991 HA5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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