The O.A.S. Astrophotography Gallery

A place for members' images...

Home > Stars, Nebulae and Galaxies > Constellations and Star Fields
Return to the thumbnail page FILE 1/100 See next file Skip to end
Abell 21 Abell 21 is a planetary nebula because the first of the types observed looked like a planet. Although the observer knew full well that they were not planets because they did not move against the background stars. A planetary nebula is what happens to a star similar to one the size of the Sun or smaller at the end of it's life when it puffs out its outer atmosphere. Link-words: Abell 21 Seestar

Abell 21

Abell 21 is a planetary nebula because the first of the types observed looked like a planet. Although the observer knew full well that they were not planets because they did not move against the background stars.
A planetary nebula is what happens to a star similar to one the size of the Sun or smaller at the end of it's life when it puffs out its outer atmosphere.
Rate this file (No vote yet)
File information
Filename:Abell_21_1265x10sec_T11C_2024_11_28_Final.png
Album name:Whitters / Constellations and Star Fields
Link-words:Abell / 21 / Seestar
Image date, time and location:21/11/2024 3h 30m 50s - 1265 x 10s Mileaway Observatory East Sussex
Telescope aperture and focal ratio:Seestar S50
Camera and filters used:Seestar S50
Processing applied:Images with a Seestar S50 Aligned and stacked in Siril, then processed in Pixinsight using Graxpert, NoiseXterminator, BlurXterminator and Curves
Filesize:2536 KiB
Date added:Dec 13, 2024
Dimensions:834 x 1431 pixels
Displayed:6 times
URL:http://gallery.orpington-astronomy.org.uk/displayimage-2950-_Abell_21_.html
Favorites:Add to Favorites