What to Expect during the August 21, 2017 Eclipse

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Presentation transcript:

What to Expect during the August 21, 2017 Eclipse Latest update – June 9, 2014 for 2017 Eclipse Presentation Copyright © 2005-2017 by Bernie Volz, All rights reserved. Last updated 07/4/2017 http://www.eclipse2017.org/2017/2017_anim.htm

Eclipse Path through Missouri

Columbia, MO & Eclipse Site

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Local Circumstances 38° 58' 09.3" N <—> 38.6994° 2m39.0s (total eclipse) 92° 32' 59.9" W <—> -92.5499° Date: 08/21/2017 UT Umbral depth : 92.21% Obscuration : 100.00% Magnitude at mid eclipse : 1.014 Moon/Sun size ratio : 1.03054 Event Time (UT) __ Alt __Azi___ Start of partial eclipse (C1): 16:45:12.3 +56.6° 138.2° Start of total eclipse (C2): 18:11:50.2 +62.9° 179.3° Mid eclipse: 18:13:09.7 +62.9° 180.0° End of total eclipse (C3): 18:14:29.2 +62.9° 180.7° End of partial eclipse (C4): 19:39:47.1 +56.8° 221.2° Local time is UT -5 hours (C1 = 11:45:12.3, C2 = 13:11:50.2, Mid = 13:13:09.7, C3 = 13:14:29.2, C4 = 14:39:47.1). Calculated using http://eclipse.gsfc.nasa.gov/SEsearch/SEsearchmap.php?Ecl=20170821

First Contact Moon begins to move over Sun from West Starts at ~11:45:12 AM Must observe sun with filter! Good time to check and adjust mount tracking and alignment Watch for sunspots 6/21/2001 – Zambia (Mario Motta)

First Contact Crescent images of Sun Watch sky and environment Natural pin-holes such as leaves on trees Pin-holes in cardboard Watch sky and environment Gradually darkens Temperature drops Mario Motta 8/11/1999 Hungary (Eric Pauer)

~1 min Before Second Contact Shadow bands Are faint ripples of grayish light that wiggle briskly across landscape Similar to ripples seen at bottom of pools Caused by atmospheric refraction Occur about a minute before Second Contact Spread white sheet on ground to see Usually not seen unless sky is crystal clear Photos from http://www.liv.ac.uk/~ggastro/ES.obs.html

~Minute Before Second Contact 6/21/2001 Zambia (Mario Motta) Onrushing shadow from west ~Minute before Second Contact Watch color and general appearance 6/30/1992 – Uruguay (Bernie Volz)

30 Seconds Before Second Contact Baily’s Beads (~1:11:20 PM) Starts about 30 secs before Second Contact Last bit of sunlight shines through the moon’s jagged edge Filters off of cameras and telescopes! 6/21/2001 – Zambia (Mario Motta)

Last Seconds Before Second Contact Diamond Ring Last “baily’s bead” Lasts only a few seconds before Moon completely covers the Sun 11/3/1994 - Bolivia

Second Contact Start of TOTALITY! Moon completely covers the Sun FILTERS OFF - Safe to directly view totality At site: ~11:11:50 AM Lasts for 2 minutes and 39 seconds Sun/Moon altitude of ~62.9° azimuth of ~180° 11/3/1994 – Bolivia (Mario Motta)

Totality The Corona What everyone is waiting for! Best viewed with binoculars Look for streamers and how far out they go (Sun/Moon are ~½°) Each eclipse’s corona is unique - study this one carefully Look for polar brushes! 11/3/1994 – Bolivia (Mario Motta)

6/21/2001 – Zambia (Mario Motta)

Bernie Volz Baby Beach, Aruba 2/26/1998

La Paz, Mexico 7/11/1991

Bert Halstead, March 29th, 2006, Egypt, Composite

Totality Prominences Red areas near solar (lunar) disk May have none or may have several Depends on solar activity 08/11/1999 - Hungary

Solar Cycle – Past Solar Max

Totality Look around at the twilight sky Planets Stars Constellations

Planisphere Projection of Sky during Totality Using The Sky X To use, hold over your head with directions oriented properly.

Totality Take in the environment Darkness of eclipse Animal reactions Temperature drop Wind speed 7/11/1991 Mexico (Mike Terenzoni) 2/26/1998 – Aruba (Peter Bealo)

Totality Don’t forget to take your photographs Don’t forget to LOOK Don’t need “fast” film - ISO 100 is fine Bracket, Bracket, Bracket! For Mercury - f/8, ISO 100 = ~1/125 For Venus - f/8, ISO 100 = ~1/500 Don’t forget to LOOK You only have 2 minutes and 39 seconds!

Field of View and Sun’s Image Size vs Focal Length (35mm film) 100 mm (Bernie Volz) 270 mm 1000 mm (Mario Motta)

Field of View and Sun’s Image Size vs Focal Length (35mm film)

Solar Eclipse Exposure Guide

Third Contact Moon no longer completely covers Sun Same transition, but in reverse, as from First to Second Contact Diamond Ring Baily’s Beads FILTERS ON!! Retreating shadow (East) Shadow bands 6/21/2001 – Zambia (Mario Motta)

Fourth Contact Eclipse Ends (~2:40 PM) Moon has moved eastward completely off the Sun 2/26/1998 – Aruba (Bernie Volz) 6/21/2001 – Zambia (Bernie Volz)

08/11/1999 10:20 UT 08/11/1999 10:50 UT 08/11/1999 11:20 UT