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JPL Small-Body Database Browser
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39998 (1998 HS78)
Classification: Main-belt Asteroid          SPK-ID: 2039998
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05687279997626626 3.2547e-08  
a 2.450522714390351 1.1209e-08 au
q 2.311154626217531 8.1319e-08 au
i 4.819995677558817 3.5584e-06 deg
node 239.5169814496347 5.0278e-05 deg
peri 345.2919086652816 6.2122e-05 deg
M 263.5885681054466 3.7156e-05 deg
tp 2459375.742964015507
(2021-Jun-10.24296402)
0.00014475 TDB
period 1401.156111791075
3.84
9.6133e-06
2.632e-08
d
yr
n .2569306852894628 1.7628e-09 deg/d
Q 2.589890802563171 1.1846e-08 au
  Orbit Determination Parameters
   # obs. used (total)      932  
   data-arc span      17792 days (48.71 yr)  
   first obs. used      1971-05-13  
   last obs. used      2020-01-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55992  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:40:50  

Additional Information
 Earth MOID = 1.30171 au 
 Jupiter MOID = 2.39066 au 
 T_jup = 3.489 
[ show covariance matrix ]

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 15.4   n/a MPO449244  

39998 (1998 HS78)          Discovered 1998-Apr-21 by LINEAR at Socorro
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HS78 = 1999 TD256 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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