Besseliam Elements for Annular Solar Eclipse of 2017 Feb 26 (original) (raw)

Fred Espenak

The following table contains the Besseliam elements for the Annular Solar Eclipse of 2017 Feb 26 .

The geographic coordinates of the eclipse path are listed in the Path Table . The global visibility of the eclipse is shown on an Orthographic Map . The features of this map are described in the Key to Solar Eclipse Path Tables. The path of the eclipse is displayed in greater detail on a Google Map .

Besselian Elements for the Annular Solar Eclipse of 2017 Feb 26

        Equatorial Conjunction:     14:39:54.4 TDT     J.D. = 2457811.111046
          (Sun & Moon in R.A.)    (=14:38:46.1 UT)

         Ecliptic Conjunction:      14:59:31.7 TDT     J.D. = 2457811.124673
         (Sun & Moon in Ec. Lo.)  (=14:58:23.5 UT)

              Instant of            14:54:32.8 TDT     J.D. = 2457811.121213
           Greatest Eclipse:      (=14:53:24.6 UT)


        --------------------------------------------------------------------------- 
                    Gamma = -0.4578            Ephemerides = JPL DE405
        Eclipse Magnitude =  0.9922           Lunation No. =     212
                       ΔT =    68.3 s         Saros Series =  140 (29/71)

        Lunar Radius   k1 = 0.272508 (Penumbra)        Shift in      Δb =  0.00"
         Constants:    k2 = 0.272281 (Umbra)       Lunar Position:   Δl =  0.00"

        --------------------------------------------------------------------------- 
        Geocentric Coordinates of Sun & Moon at Greatest Eclipse (JPL DE405):

        Sun:       R.A. = 22h39m23.1s         Moon:      R.A. = 22h39m53.2s
                   Dec. =-08°29'38.8"                    Dec. =-08°55'03.6"
          Semi-Diameter =    16'09.0"           Semi-Diameter =    15'47.8"
            Eq.Hor.Par. =       08.9"             Eq.Hor.Par. =  0°57'58.6"

        --------------------------------------------------------------------------- 
        Polynomial Besselian Elements for:   2017 Feb 26   15:00:00.0 TDT  (=t0)

          n        x          y         d          l1         l2          μ

          0   0.175935  -0.425555   -8.49165   0.552489   0.006300   41.79895
          1   0.5253547  0.1532535   0.015261 -0.0001257 -0.0001251  15.003085
          2  -0.0000062  0.0000792   0.000002 -0.0000115 -0.0000115
          3  -0.0000074 -0.0000021

                         Tan ƒ1 = 0.0047219    Tan ƒ2 = 0.0046984

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

           a = a0 + a1*t + a2*t^2 + a3*t^3    (or a = Σ [an*t^n]; n = 0 to 3)

              where:    a = x, y, d, l1, l2, or μ
                        t = t1 - t0  (decimal hours) and t0 = 15.000 TDT


        The Besselian elements were derived from a least-squares fit to elements
        calculated at five uniformly spaced times over a six hour period centered at t0.
        The Besselian elements are valid over the period 12.00 ≤ t0 ≤ 18.00 TDT.

        Note that all times are expressed in Terrestrial Dynamical Time (TDT).

               Saros Series 140:  Member 29 of 71 eclipses in series.

Instant of Greatest Eclipse: Time = 14:53:24.6 UT Lat = 34°40.8'S Long = 031°11.5'W (GE) Sun Altitude = 62.6° Path Width = 30.6 km Sun Azimuth = 340.5° Central Duration = 00m44.0s

Instant of Greatest Duration: Time = 13:16:06 UT Lat = 43°08'S Long = 113°53'W (GD) Sun Altitude = 0.0° Path Width = 96.3 km Sun Azimuth = 101.7° Central Duration = 01m22.4s

Eclipse Predictions

Predictions for the Annular Solar Eclipse of 2017 Feb 26 were generated using the JPL DE405 solar and lunar ephemerides and a value of ΔT = 68.3 seconds.

Acknowledgments

All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy. Permission is freely granted to reproduce this data when accompanied by an acknowledgment:

"Eclipse Predictions by Fred Espenak, NASA's GSFC"

For more information, see: NASA Copyright Information