Saturday, January 3, 2026

Perihelion

 Today was doubly eventful.  This morning the first full moon of 2026 occurred at 3:04 am MST.  Seven hours later at 10:15 am MST the Earth reached perihelion (closest distance) in its orbit around the Sun.  The two events are totally unrelated.   The angular size of the sun is currently 32.5 arcmin or 0.542 deg.  I photographed it in both white light and Hydrogen-Alpha light.

Equipment:  Astro-Tech AT72EDII f/6 refractor + Kendrick solar filter for a "white-light" photosphere image, and a Lunt LS50THa double-stacked solar scope + ASI178mm camera for a view of the Hydrogen-Alpha chromosphere.

 

"white light"


Hydrogen-Alpha

Hydrogen-Alpha: negative, false-color

The negative, false-color image makes it easier to see the prominences.

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