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Total Solar Eclipse of 1999 August 11

Table 1 - Elements of the Eclipse

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Geocentric Conjunction      10:52:16.66 TDT     J.D. = 2451401.952971
 of Sun & Moon in R.A.:   (=10:51:12.06 UT)

      Instant of            11:04:09.01 TDT     J.D. = 2451401.961215
   Greatest Eclipse:      (=11:03:04.41 UT)


Geocentric Coordinates of Sun & Moon at Greatest Eclipse (DE200/LE200):

Sun:       R.A. = 09h23m08.297s       Moon:      R.A. = 09h23m34.531s
           Dec. =+15°19´39.72"                   Dec. =+15°48´38.51"
  Semi-Diameter =    15´46.77"          Semi-Diameter =    16´00.34"
    Eq.Hor.Par. =        8.68"            Eq.Hor.Par. =  0°58´44.24"
     delta R.A. =        9.467s/h         delta R.A. =      142.037s/h
     delta Dec. =      -44.35"/h          delta Dec. =     -462.21"/h


Lunar Radius   k1 = 0.2725076 (Penumbra)        Shift in      delta b =  0.00"
 Constants:    k2 = 0.2722810 (Umbra)       Lunar Position:   delta l =  0.00"

Geocentric Libration:   l =   4.8°       Brown Lun. No. = 1232
(Optical + Physical)    b =  -0.8°         Saros Series =  145 (21/77)
                        c =  19.7°            Ephemeris = (DE200/LE200)

Eclipse Magnitude = 1.02859        Gamma = 0.50623        delta T =    64.6 s


Polynomial Besselian Elements for:   1999 Aug 11   11:00:00.0 TDT  (=t0)

  n        x          y         d          l1         l2          

  0   0.0700559  0.5028388 15.3273401  0.5424893 -0.0036496 343.690308
  1   0.5443045 -0.1184931 -0.0120348  0.0001168  0.0001163  15.002983
  2  -0.0000406 -0.0001158 -0.0000033 -0.0000117 -0.0000116   0.000002
  3  -0.0000081  0.0000017  0.0000000  0.0000000  0.0000000   0.000000

                 Tan f1 = 0.0046129    Tan f2 = 0.0045900

At time "t1" (decimal hours), each Besselian element is evaluated by:

            a = a0 + a1*t + a2*t2 + a3*t3    (or a =  [an*tn]; n = 0 to 3)

    where:  a = x, y, d, l1, l2, or 
            t = t1 - t0  (decimal hours) and t0 = 11.000 TDT

The Besselian elements were derived from a least-squares fit to elements 
calculated at five separate times over a six hour period centered at t0. 
Thus the Besselian elements are valid over the period 8.00 < t0 < 14.00 TDT.

       Saros Series 145:  Member 21 of 77 eclipses in series.


Table adapted from NASA RP 1398 "Total Solar Eclipse of 1999 August 11".

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WebMaster: Fred Espenak
Planetary Systems Branch - Code 693
e-mail: espenak@lepvax.gsfc.nasa.gov

NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771 USA


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Last revised: 1997 April 15 - F. Espenak