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39777 (1997 HE)
Classification: Main-belt Asteroid          SPK-ID: 2039777
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1187708026315398 4.2189e-08  
a 2.799561293507949 1.4901e-08 au
q 2.467055151661818 1.1893e-07 au
i 7.432559081059099 4.3989e-06 deg
node 201.1182725577007 3.2051e-05 deg
peri 150.1324490156867 3.562e-05 deg
M 184.869032388275 1.7536e-05 deg
tp 2459832.826733269725
(2022-Sep-10.32673327)
8.6171e-05 TDB
period 1710.9345540842
4.68
1.366e-05
3.74e-08
d
yr
n .2104113211932263 1.6799e-09 deg/d
Q 3.13206743535408 1.6671e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1102  
   data-arc span      8426 days (23.07 yr)  
   first obs. used      1997-04-27  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52423  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:19:48  

Additional Information
 Earth MOID = 1.46524 au 
 Jupiter MOID = 2.33359 au 
 T_jup = 3.303 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457271.5 (2015-Sep-06.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1169170396234232 4.2083e-08  
q 2.474900575696505 1.183e-07 au
tp 2458121.396209192452
(2018-Jan-02.89620919)
8.2255e-05 TDB
node 201.1470479634534 3.208e-05 deg
peri 149.8940046011049 3.5759e-05 deg
i 7.425411176037692 4.3966e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1102  
   data-arc span      8426 days (23.07 yr)  
   first obs. used      1997-04-27  
   last obs. used      2020-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52423  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 00:19:48  

Additional Information
 Jupiter MOID = 2.33359 au 
 T_jup = 3.303 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.770957236972609E-15 -4.947347022932575E-15 -1.912758856006419E-13 8.48260712051426E-15 -6.807070328194922E-14 4.363316161315515E-16
q -4.947347022932575E-15 1.399435349037663E-14 8.652741442228242E-13 -2.43111191755364E-14 2.353061801042503E-13 -1.186809848198175E-15
tp -1.912758856006419E-13 8.652741442228242E-13 6.765896783385385E-9 1.50895380702937E-11 1.31679460600568E-9 -1.431195258591752E-12
node 8.48260712051426E-15 -2.43111191755364E-14 1.50895380702937E-11 1.02914952492668E-9 -1.017100050966261E-9 -4.35714905488982E-11
peri -6.807070328194922E-14 2.353061801042503E-13 1.31679460600568E-9 -1.017100050966261E-9 1.278696799211965E-9 4.292184384000565E-11
i 4.363316161315515E-16 -1.186809848198175E-15 -1.431195258591752E-12 -4.35714905488982E-11 4.292184384000565E-11 1.932995390803724E-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 14.6   n/a MPO426182  
diameter diameter 4.197 km 0.805 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.159   0.125 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

39777 (1997 HE)          Discovered 1997-Apr-27 by Spacewatch at Kitt Peak
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1997 HE = 1999 TY177 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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