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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 | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06263651717607592 1.8817e-08  
a 2.390785702271341 8.6992e-09 au
q 2.241035212566705 4.5461e-08 au
i 7.65108110412813 7.8594e-07 deg
node 27.91674574400351 4.9808e-06 deg
peri 75.78119014300488 1.0678e-05 deg
M 105.6414951386188 6.7715e-06 deg
tp 2458804.275395904937
(2019-Nov-16.77539590)
2.5609e-05 TDB
period 1350.235125762417
3.70
7.3695e-06
2.018e-08
d
yr
n .2666202301593392 1.4552e-09 deg/d
Q 2.540536191975976 9.2441e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1777  
   data-arc span      25655 days (70.24 yr)  
   first obs. used      1950-03-17  
   last obs. used      2020-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47578  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:12:29  

Additional Information
 Earth MOID = 1.27203 au 
 Jupiter MOID = 2.53555 au 
 T_jup = 3.517 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457233.5 (2015-Jul-30.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06177375452302505 1.8864e-08  
q 2.243452917882799 4.5568e-08 au
tp 2457455.798880397505
(2016-Mar-08.29888040)
2.8009e-05 TDB
node 27.93711519324707 4.9817e-06 deg
peri 76.4100923858072 1.0747e-05 deg
i 7.650949445964884 7.8558e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      1777  
   data-arc span      25655 days (70.24 yr)  
   first obs. used      1950-03-17  
   last obs. used      2020-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47578  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:12:29  

Additional Information
 Jupiter MOID = 2.53555 au 
 T_jup = 3.517 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.55851837600312E-16 -8.45712925633098E-16 5.897986573620184E-14 -1.205990158545666E-14 4.799356239762079E-14 -1.79334495355057E-15
q -8.45712925633098E-16 2.076427944998696E-15 -2.321715522227786E-13 2.913310964819351E-14 -1.429168112372882E-13 4.210313996767322E-15
tp 5.897986573620184E-14 -2.321715522227786E-13 7.844929125994212E-10 -3.910542261700311E-11 2.676534259105031E-10 -2.43396808394053E-12
node -1.205990158545666E-14 2.913310964819351E-14 -3.910542261700311E-11 2.481714345339878E-11 -3.607664894184378E-11 1.32687719519026E-12
peri 4.799356239762079E-14 -1.429168112372882E-13 2.676534259105031E-10 -3.607664894184378E-11 1.154879264304948E-10 -2.360781831866312E-12
i -1.79334495355057E-15 4.210313996767322E-15 -2.43396808394053E-12 1.32687719519026E-12 -2.360781831866312E-12 6.171414461482491E-13

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 14.31   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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2119-Jul-08 08:11 < 00:01 Eunom 0.037660238948521 0.0376449574242459 0.0376755206721706 5.9752286780513 5.97522861566973 2495196.841294716 0.472354809454529 773.821416967587 36.1766455274854 -10.1808443662992 28427.6198417766 T 32 CATAB v2.0f-lin.ifort 2021-Apr-13 02:13:16 2021-Apr-13 02:13

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