EAA Observing Session: 3, December04/12/2025
Astronomy

Session Data

  • Date:  03/12/2025
  • Time:  12:17 – 13:17 UT
  • Seeing: II. Good – Slight
  • Transparency: III. Clear with slight haze
  • Temp: 10 C,
  • Air Pressure: 1019mb
  • Humidity: 87%
  • Dew Point: 8 C
  • Wind Speed: 5 mph
  • Average SQM:  magn/arcsec^2

Scope: Altair 250mm R.C at f/5.3  Camera: ZWO ASI 183MM. No darks or flats.

Click image to view full size.

I had been watching the development of one of the largest sunspot groups of this solar cycle, but the weather had been terrible until today.

I didn’t have time to orientate the camera properly, so this does not show the correct Solar orientation.

In terms of the size of this grouping, this rivals AR3664 that I observed back in May of 2024

https://banjoherder.com/2024/05/sunspot-ar3664-development/

Image Credit: https://soho.nascom.nasa.gov/

Starting top left then down and right, we have spots 4299, 4300, 4295, 4297 4296, 4294 and 4298 and just to the top left of the frame 4297