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7738 Heyman (1981 WS1)
Classification: Main-belt Asteroid          SPK-ID: 2007738
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1825145896004241 2.9039e-08  
a 2.249844181567346 7.3844e-09 au
q 1.83921479410368 6.7013e-08 au
i 5.956791581001486 3.3618e-06 deg
node 66.30083426993816 3.4966e-05 deg
peri 220.6571547968946 3.7785e-05 deg
M 259.1703161429777 1.7891e-05 deg
tp 2459345.733549252798
(2021-May-11.23354925)
6.2249e-05 TDB
period 1232.613978114257
3.37
6.0685e-06
1.661e-08
d
yr
n .2920622404029155 1.4379e-09 deg/d
Q 2.660473569031013 8.7321e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2187  
   data-arc span      14100 days (38.60 yr)  
   first obs. used      1981-10-30  
   last obs. used      2020-06-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47402  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:25:59  

Additional Information
 Earth MOID = .827702 au 
 Jupiter MOID = 2.50016 au 
 T_jup = 3.599 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO502226  
diameter diameter 3.859 km 0.232 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.327   0.071 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7738 Heyman           Discovered 1981 Nov. 24 at the Oak Ridge Observatory.
Named in honor of I. Michael Heyman (b. 1930), secretary and linchpin of the Smithsonian Institution's diverse and incomparably rich programs. Educator, legal scholar, civil rights champion, he has unfailingly supported research at the frontiers of astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19980808/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 1981 WS1 = 1991 UW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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