Thursday, December 4, 2025

Cold Moon, active sun

The full moon of December is traditionally called the "Cold Moon".  An appropriate nickname - the temperature is already in the single-digits Fahrenheit two hours before midnight.  This year it is also a perigean full moon (aka "super moon"), so it is noticeably brighter than average.

Cold Moon rising over Snowshoe Mountain, 04 December.


Cold Moon illumination.  Laowa 7.5mm f/2 lens, 2-hr live composite.

A large sunspot group is traversing the sun.  

 
White light. AT80EDT refractor + Lunt solar wedge.

Hydrogen-Alpha light.  Lunt LS50THa with double-stacked etalons.

Even though it is winter, heat currents in the air make it difficult to get sharp single images of the sun during the middle of the day.

Tuesday, December 2, 2025

December-01 moonlight star trails

 The landscape was lit up by the 11.6-day moon.  There was a gusty wind blowing, which required the camera to be set up on the leeward side of a shed for protection.  Temperature was 11° F heading toward an eventual low of 1.4° F the next morning.

Equipment: Olympus E-M1iii + Rokinon 7.5mm f/3.5 fisheye lens.

2-hr live composite mode

 
1-hr live composite.


Monday, December 1, 2025

New sunspots

A large sunspot group has just rotated into view.  This group is so large that it was visible to the NASA Perserverance Rover on Mars, which was not designed for high-resolution solar observation.   Who knows, more northern-lights displays may be in our near future.

Equipment: Olympus E-M1iii + AT80EDT refractor + Lunt Solar Wedge + ND0.6 filter.