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121121 Koyoharugotoge (1999 HJ3)
Classification: Inner Main-belt Asteroid          SPK-ID: 2121121
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02918504161429974 7.2202e-08  
a 1.884935013316718 8.7554e-09 au
q 1.829923106512819 1.3457e-07 au
i 23.29082133095387 8.1821e-06 deg
node 71.55295103731498 1.3222e-05 deg
peri 172.4341616712374 8.6771e-05 deg
M 99.03984721167497 8.7375e-05 deg
tp 2458940.453830890343
(2020-Mar-31.95383089)
0.00022903 TDB
period 945.2419759835893
2.59
6.5859e-06
1.803e-08
d
yr
n .3808548595457742 2.6536e-09 deg/d
Q 1.939946920120617 9.0109e-09 au
  Orbit Determination Parameters
   # obs. used (total)      269  
   data-arc span      9518 days (26.06 yr)  
   first obs. used      1994-06-03  
   last obs. used      2020-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59409  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:52:21  

Additional Information
 Earth MOID = .81461 au 
 Jupiter MOID = 3.08862 au 
 T_jup = 3.866 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457190.5 (2015-Jun-17.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02894815533297091 7.2113e-08  
q 1.830487240309672 1.3432e-07 au
tp 2457050.796296706875
(2015-Jan-28.29629671)
0.0002293 TDB
node 71.58293264588799 1.3223e-05 deg
peri 172.7811291590183 8.7737e-05 deg
i 23.29114746257121 8.182e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      269  
   data-arc span      9518 days (26.06 yr)  
   first obs. used      1994-06-03  
   last obs. used      2020-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59409  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 17:52:21  

Additional Information
 Jupiter MOID = 3.08862 au 
 T_jup = 3.866 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.200281960187942E-15 -9.667694027470088E-15 -5.27121649404478E-12 -2.684683610247301E-14 -1.901064331246421E-12 -2.802505545956699E-14
q -9.667694027470088E-15 1.804134451465181E-14 1.022409086091155E-11 4.905422907267812E-14 3.696402886738247E-12 5.422460608495447E-14
tp -5.27121649404478E-12 1.022409086091155E-11 5.258068592823337E-8 5.985358568884652E-11 1.990222322865031E-8 9.820661909499216E-11
node -2.684683610247301E-14 4.905422907267812E-14 5.985358568884652E-11 1.748413124115701E-10 -1.380018446880049E-10 -4.700173896753246E-11
peri -1.901064331246421E-12 3.696402886738247E-12 1.990222322865031E-8 -1.380018446880049E-10 7.697737106825611E-9 8.033988324423363E-11
i -2.802505545956699E-14 5.422460608495447E-14 9.820661909499216E-11 -4.700173896753246E-11 8.033988324423363E-11 6.694441584387895E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.01   n/a E2021B55  

121121 Koyoharugotoge           Discovered 1999 Apr. 19 by R. A. Tucker at at the Goodricke-Pigott Observatory, Tucson.
Koyoharu Gotoge (b. 1988) is a Japanese mangaka and the author of the manga Demon Slayer: Kimetsu no Yaiba, which inspired the realization of the popular anime series with the same name.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2020-08-07Last Updated: 2020-08-24

Alternate Designations
 1999 HJ3 = 1994 LU6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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