Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
17769 (1998 EM9)
Classification: Main-belt Asteroid          SPK-ID: 2017769
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06252100196960127 1.8722e-08  
a 2.390865536944143 8.5309e-09 au
q 2.241386227999806 4.5045e-08 au
i 7.650970639747579 7.8536e-07 deg
node 27.91544629566418 4.9791e-06 deg
peri 75.72702376260271 1.0635e-05 deg
M 157.9676286627255 6.7681e-06 deg
tp 2458803.988542518953
(2019-Nov-16.48854252)
2.5593e-05 TDB
period 1350.302758222695
3.70
7.2271e-06
1.979e-08
d
yr
n .2666068759822735 1.4269e-09 deg/d
Q 2.540344845888479 9.0643e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1827  
   data-arc span      26072 days (71.38 yr)  
   first obs. used      1950-03-17  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47573  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:25:39  

Additional Information
 Earth MOID = 1.27274 au 
 Jupiter MOID = 2.53511 au 
 T_jup = 3.517 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457263.5 (2015-Aug-29.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0617711009874565 1.8784e-08  
q 2.243436316969901 4.5249e-08 au
tp 2457455.830052188672
(2016-Mar-08.33005219)
2.7812e-05 TDB
node 27.93716060860748 4.9798e-06 deg
peri 76.41953823844553 1.0676e-05 deg
i 7.650971644586148 7.85e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      1827  
   data-arc span      26072 days (71.38 yr)  
   first obs. used      1950-03-17  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47573  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 14:25:39  

Additional Information
 Jupiter MOID = 2.53511 au 
 T_jup = 3.517 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.528336560904493E-16 -8.363619767131164E-16 5.300502910194316E-14 -1.184049344168156E-14 4.580501635920975E-14 -1.749889482301537E-15
q -8.363619767131164E-16 2.047499576161033E-15 -2.138922650107786E-13 2.845248217187102E-14 -1.36202222368693E-13 4.077303770645763E-15
tp 5.300502910194316E-14 -2.138922650107786E-13 7.735082105375573E-10 -3.866852696209334E-11 2.635681141423902E-10 -2.354759749793737E-12
node -1.184049344168156E-14 2.845248217187102E-14 -3.866852696209334E-11 2.479854382047595E-11 -3.591462527628058E-11 1.324637652678241E-12
peri 4.580501635920975E-14 -1.36202222368693E-13 2.635681141423902E-10 -3.591462527628058E-11 1.139714545411069E-10 -2.331988036081357E-12
i -1.749889482301537E-15 4.077303770645763E-15 -2.354759749793737E-12 1.324637652678241E-12 -2.331988036081357E-12 6.162239342424625E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-22 19:23 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin