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85455 (1997 HJ)
Classification: Main-belt Asteroid          SPK-ID: 2085455
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1703059516826298 3.7036e-08  
a 2.339299485029207 9.3934e-09 au
q 1.940902859960622 8.639e-08 au
i 4.430403331992252 4.3623e-06 deg
node 38.59178868786715 4.6433e-05 deg
peri 169.1330649429033 4.8059e-05 deg
M 223.5785867024485 1.4576e-05 deg
tp 2459695.730299769156
(2022-Apr-26.23029977)
5.4858e-05 TDB
period 1306.854280478973
3.58
7.8715e-06
2.155e-08
d
yr
n .275470651454772 1.6592e-09 deg/d
Q 2.737696110097791 1.0993e-08 au
  Orbit Determination Parameters
   # obs. used (total)      670  
   data-arc span      8676 days (23.75 yr)  
   first obs. used      1997-04-11  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51057  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 07:40:42  

Additional Information
 Earth MOID = .935363 au 
 Jupiter MOID = 2.22133 au 
 T_jup = 3.542 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457767.5 (2017-Jan-14.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1700763357513263 3.7148e-08  
q 1.941851793275456 8.666e-08 au
tp 2458389.567324753097
(2018-Sep-28.06732475)
4.9919e-05 TDB
node 38.6112620815459 4.6395e-05 deg
peri 169.2623453520081 4.8015e-05 deg
i 4.432120056371961 4.3634e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      670  
   data-arc span      8676 days (23.75 yr)  
   first obs. used      1997-04-11  
   last obs. used      2021-01-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51057  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 07:40:42  

Additional Information
 Jupiter MOID = 2.22133 au 
 T_jup = 3.542 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.379998276963233E-15 -3.206254249793968E-15 2.953534729839587E-13 1.899231981160408E-15 8.67954486870422E-14 -1.552963201978889E-16
q -3.206254249793968E-15 7.509897743566542E-15 -4.693910369511734E-13 -4.342191721806897E-15 -1.565579914669865E-13 5.098595508951072E-16
tp 2.953534729839587E-13 -4.693910369511734E-13 2.491905356558287E-9 -1.398583518870231E-12 6.250641160947177E-10 8.376593050543382E-13
node 1.899231981160408E-15 -4.342191721806897E-15 -1.398583518870231E-12 2.152501437518156E-9 -2.145912667701049E-9 2.334145953639694E-11
peri 8.67954486870422E-14 -1.565579914669865E-13 6.250641160947177E-10 -2.145912667701049E-9 2.305469996396484E-9 -2.305198248849451E-11
i -1.552963201978889E-16 5.098595508951072E-16 8.376593050543382E-13 2.334145953639694E-11 -2.305198248849451E-11 1.903886150771917E-11

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 16.2   n/a MPO240811  

85455 (1997 HJ)          Discovered 1997-Apr-28 by Spacewatch at Kitt Peak
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

[ 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
1917-Aug-17 10:00 < 00:01 Eunom 0.0312406605610856 0.0312338311984793 0.0312475043465793 8.04264409794576 8.04264404207626 2421457.916595668 0.294771861699416 1125.86243394341 56.4055659244548 -72.6061953330258 79054.537715211 T 21 CATAB v2.0f-lin.ifort 2021-Feb-24 07:40:43 2021-Feb-24 07:40

Alternate Designations
 1997 HJ = 2004 CV95 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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