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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05710906580463292 3.3443e-08  
a 2.450213329589352 1.1667e-08 au
q 2.310283935314446 8.28e-08 au
i 4.820539912760954 3.6008e-06 deg
node 239.5192572538949 5.2981e-05 deg
peri 345.1719734694506 6.5442e-05 deg
M 160.9502995688748 3.8673e-05 deg
tp 2457974.183918815739
(2017-Aug-08.68391882)
0.00015084 TDB
period 1400.890770817409
3.84
1.0006e-05
2.739e-08
d
yr
n .2569793502101115 1.8355e-09 deg/d
Q 2.590142723864259 1.2333e-08 au
  Orbit Determination Parameters
   # obs. used (total)      912  
   data-arc span      17739 days (48.57 yr)  
   first obs. used      1971-05-13  
   last obs. used      2019-12-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56175  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 03:12:26  

Additional Information
 Earth MOID = 1.3009 au 
 Jupiter MOID = 2.39116 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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