[MIham] 2005 Oct 17: Partial Lunar Eclipse

[FSK]

2005 Oct 17: Partial Lunar Eclipse
The last event of the year is a rather shallow partial eclipse of the Moon.
The penumbral phase begins at 09:51 UT, but most observers will not be able
to visually detect the shadow until about 10:30 UT A timetable for the major
phases of the eclipse is as follows:

             Penumbral Eclipse Begins:   09:51:25 UT
               Partial Eclipse Begins:   11:33:59 UT
                     Greatest Eclipse:   12:03:18 UT
                 Partial Eclipse Ends:   12:32:26 UT
               Penumbral Eclipse Ends:   14:15:08 UT
In spite of the fact that the eclipse is so shallow (the Moon's southern
limb dips just 2.2 arc-minutes into Earth's dark umbral shadow), the partial
phase last nearly one hour. This is due to the grazing geometry of the Moon
and umbra

At the instant of greatest eclipse (12:03 UT), the Moon will stand near the
zenith for observers in the central Pacific. At that time, the umbral
eclipse magnitude will be only 0.068. North Americans will all see the start
of the event, but the Moon sets by mid-eclipse for observers east of the
Mississippi River and Great Lakes. Further west, the entire event is visible
from the Pacific coast provinces and states as well as eastern Asia and
Australia. The Moon's path through Earth's shadows as well as a map
illustrating worldwide visibility of the event is shown in (Figure 6)


----------------------------------------------------------------------------
----

  a.. Key to Solar Eclipse Maps
  b.. Key to Lunar Eclipse Maps
  c.. Danjon Scale of Lunar Eclipse Brightness
  d.. Crater Timings During Lunar Eclipses

----------------------------------------------------------------------------
----

Eclipse Altitudes and Azimuths
The altitude a and azimuth A of the Sun or Moon during an eclipse depends on
the time and the observer's geographic coordinates. They are calculated as
follows:

             h  = 15 (GST + UT - ra ) + l
             a  =  ArcSin  [ Sin d Sin f + Cos d Cos h Cos f ]
             A  =  ArcTan  [ - (Cos d Sin h) / (Sin d Cos f -  Cos d Cos h
Sin f) ]

     where:
             h  =  Hour Angle of Sun or Moon
             a  =  Altitude
             A  =  Azimuth
           GST  =  Greenwich Sidereal Time at 0:00 UT
            UT  =  Universal Time
            ra  =  Right Ascension of Sun or Moon
             d  =  Declination of Sun or Moon
             l  =  Observer's Longitude (East +, West -)
             f  =  Observer's Latitude (North +, South -)
During the eclipses of 2005, the values for GST and the geocentric Right
Ascension and Declination of the Sun or the Moon (at greatest eclipse) are
as follows:
     Eclipse               Date          GST        ra        dec

     Hybrid Solar        2005 Apr 08     13.147      1.175      7.480
     Penumbral Lunar     2005 Apr 24     14.169     14.106    -13.909
     Annular Solar       2005 Oct 03      0.815     12.632     -4.084
     Total Lunar         2005 Oct 17      1.739      1.465     10.250

Eclipses During 2006
In 2006, there will be two solar eclipses and two lunar eclipses:
  a.. 2006 Mar 14: Penumbral Lunar Eclipse
  b.. 2006 Mar 29: Total Solar Eclipse
  c.. 2006 Sep 07: Partial Lunar Eclipse
  d.. 2006 Sep 22: Annular Solar Eclipse
          Checkout  My Place on the Web @ http://www.qsl.net/n8uvi

           --... ...--  ..-. .-. .- -. -.-   -. ---.. ..- ...- ..


           Man is still the most extraordinary computer of all.

   Hey, this is 'Experimental Physics' on a shoe-string: and no chewing gum!

       Proper, Pre-Planning, Prevents, Pathetically, Poor, Performance.