Astronomical Highlights 2017

My Astronomical Highlights of 2017 is, of course, the Great American Eclipse. Beside this wonderful and beautiful moment also other moments are worthwhile to share :

Solar Eclips in Rexburg Idaho Aug 21, 2017

The Milky Way or a Meteor as seen in National Park Arches (Utah)

The Sun this year with a perfect 360° Halo and with Sunspots (even when the Sun is getting into a minimum period) :

The Planets this Year with Saturnus and Jupiter :

Deepsky  Objects M42 en M51 :

And My Solargraph using a 72cl can :

Ms Hisako Koyama - Observing Sunspot for more then 40 Years

Hisako Koyama +40Years Observation of Sunspots

Via the website of the University of Colorado Boulder I found an article on "Hidden Figure" Hisako Koyama. She is a Japanese Solar Observer and observing +40 years of sunspot and making +10000 drawings. 

To better understand the solar cycle, an international group of scientists reconstructed the number of sunspots seen each year since scientists first observed them by telescope in 1610. A researchers team searched through original sunspot observations for the past 400 years and discovered Koyama’s work in Japan. They combined her collection of drawings with those of Galileo Galilei, Pierre Gassendi, Johann Caspar Staudacher, Heinrich Schwabe and Rudolf Wolf to establish a continuous sunspot count for the past four centuries. 

Those five names are the giants of sunspot records. Koyama’s more than 40 years of drawings proved invaluable to the scientists because few solar observations have been collected by the same person, using the same telescope and using the same observation method for such a long time. 

Her drawings are digitized and available via the Japanese National Museum of Nature and Science.

 

Interesting to note is that she is one of few people who ever witnessed a white-light flare with the naked eye. She recorded this on November 15, 1960.

If you want to search into the archieves for digitized sunspot drawings, use this link.

Winter Solstice

The Astronomical Winter will start Today at 17h28 local time (UT 16h28) and it is the Day with the least Sunlight.

Solargraphs Results

Magnificent Solargraph from the period July-Dec 2017 using a 72cl can with Ilford MGRC Multigrade RC Cooltone photopaper.

Solargraph made with 72cl can

Six months ago, I installed two pinhole camera's with the intention to track the sun's orbit at the sky. This was my sixt consecutive year doing these experiments. This is what I learned this year :

1)  One of my pinhole camera's had a rather large pinhole. This can result in an overexposure, so keep the pinhole as small as possible;

2)  I used a 72cl can and the results is much better when comparing with a 50cl can;

Second Solargraph : 50cl can with rather big pinhole resulting in an overexposed Solargraph

  

Pinhole Camera Ready

This year I made 5 pinhole camera's to collect Solarbeams with Solargraphs as an end result ... hopefully.

Star Wars VIII

Watching yesterday the new Star Wars "The Last Jedi" and Again it is a fantastic Episode of Star Wars. Great graphics and beautifull landscapes makes this movie one you should have seen.

Workshop Solargraphy

Presentatie van Workshop Solargraphy gegeven tijdens Helios vergadering op 10 december 2017. Klik hier voor de PDF versie van de presentatie.

Solargraph met 50Cl blik.