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39972 (1998 HT)
Classification: Main-belt Asteroid          SPK-ID: 2039972
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2049312223451785 5.2501e-08  
a 2.643775830517227 1.3682e-08 au
q 2.101983617962692 1.4071e-07 au
i 4.803104050419941 5.9492e-06 deg
node 140.5201439968571 5.7856e-05 deg
peri 183.150999634142 5.8939e-05 deg
M 315.9429901489781 1.2078e-05 deg
tp 2459192.653317214566
(2020-Dec-09.15331721)
5.3243e-05 TDB
period 1570.129122043429
4.30
1.2188e-05
3.337e-08
d
yr
n .2292805062627471 1.7798e-09 deg/d
Q 3.185568043071762 1.6486e-08 au
  Orbit Determination Parameters
   # obs. used (total)      812  
   data-arc span      12860 days (35.21 yr)  
   first obs. used      1984-01-25  
   last obs. used      2019-04-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5725  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:09:22  

Additional Information
 Earth MOID = 1.08976 au 
 Jupiter MOID = 2.15085 au 
 T_jup = 3.359 
[ 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 15.0   n/a MPO337582  
diameter diameter 5.121 km 1.399 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  
geometric albedo albedo 0.050   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2017AJ....154..168M)  

39972 (1998 HT)          Discovered 1998-Apr-17 by Spacewatch at Kitt Peak
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1998 HT = 1984 BQ3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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