A sunspot is a (relatively) cool area on the Sun’s surface (photosphere) which has an enormous amount of magnetic activity. A sunspot is a temporary phenomena on the Sun’s photosphere. The amount of sunspots visible at any time on the Sun changes periodically, as the Sun goes through a cycle of activity which lasts roughly 11 years.

The strong magnetic fields of sunspots are also responsible for solar flares, which in turn cause the Aurora Borealis (Northern and Southern Lights) here on Earth.

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Object info
Name Sun
Type G-type main-sequence star
Age ~ 4.6 billion years
Absolute magnitude 4.83
Spectral classification G2V
Distance 1 AU – 8m 19s at light speed
from Milky Way core 27.200 ly
Equatorial radius 695.700 km – 109 Earths
Mass 333.000 Earths
Eq. Surface gravity 27,94 G
Sidereal rot. period 25,05 days
Apparant magnitude -26,74
Image info
Image date May. 01, 2005
Light frames 60 x 1/1600 sec @ ISO800
Total integration
Dark frames
Flat frames
Bias frames
Software used Registax v3, Photoshop CS
Equipment info
Telescope TS 127/820mm Refractor
Mount OTE-150
Camera Canon 20D
Guide camera
Guide scope
Autoguide software
Filters Baader Astro Solar filter foil
Location Landgraaf, The Netherlands
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