Lecture by Dr. Marcel van Daalen

 

During the annual JVS/VVS weekend (October 4th), Dr. Marcel van Daalen of the university of Leiden gave a lecture on the current status of our understanding of the universum. He talked about historical facts, observations and aswell inconsistencies. 

Sol'Ex articles published in Magazine Heelal

My articles on Sol'Ex (a follow up article on the evolution of Sol'Ex and it's software)  and the observation of the E-Corona using my Sol'Ex are published in magazine Heelal.

Sun H-Alpha with active prominences September 29, 2025

 

On the North Eastern limb a free prominence and on the Mid Western limb a long prominence moving away to space... so very active prominences.
The image was processed using new JSolex 4.1.1

This CaIIH is a very sharp image taken with Solex by James R. and 2nd Gen Slit. 

Getting this sharp image is done with both:

- sharp edges

- camera sharpness

- collimator adjustment with focus on the dustlines; this seems working. 

H-alfa2cb

Setting:

TLAPO80/480 with ASI678MM and Solex by James R.

Herstel Wedge

Software: SharpCap 4, Inti 6, JSolex 4.1.1 and CS4

Tilt <0,2° and Sx/Sy 1,1

Seeing with SSM3 almost all day <1,5 arcs

Data submitted to ftp.obspm.fr SOLAP

Comet C/2025 A6 (Lemmon)

This morning I took some images of Comet C/2025 A6 (Lemmon). The comet is currently 1,1AU away from Earth and will be at closest on October 21, 2025 on a distance of 0,59AU. Perihelion transit will take place on November 8th. Max brightness is predicted between these two days with the Comet low above the horizon after sunset.

Setting: Nikon D7500 f/4 28mm ISO3200 4s.
Editing: CS4 and DeNoise AI

Artemis II Boarding Pass

Next year, April 2026, NASA plans Artemis II crewed mission around the Moon. I have already my Boarding Pass :)

Video Aurora 17092025

 

My images combined into a video of the Equinox Aurora in Iceland (Sandgeroi).
Images taken on Sept 17, 2025 with Nikon D7500 and 10mm Tamron Lens.

Halo from airplane

When preparing for landing in Iceland, I was able to make some pictures of a halo with our plane.