The Sun 3.september 2017

During the acquisition of this image, sunspot AR2673 (below and to right of centre) was growing to more than ten times its original size during the course of only 24 hours. It quickly became one of the largest sunspots of 2017.

Solar image 3 Sept 2017
Click to enlarge, click once more for full resolution.

The Sun's diameter is 109 x Earth's diameter. The largest sunspot on the image is three times Earth's diameter. 


Date: 3 September 2017, 13:30 GMT

Telescope: Skywatcher Esprit ED 120

Mount: Astrosysteme Austria ASA DDM160

Solar filter: Thousand Oaks Type 2+, 90 mm diameter

Camera: Lumenera SKYnyx2-2M


Seeing: moderate

Exposure: 11 ms

Number of images in stack = 35 of 200

Stacking: AviStack2