WikiNow lets you discover the news you care about, follow the topics that matter to you and share your favourite stories with your friends.

© WikiNow

Messier 103 is an open cluster where a few thousand stars formed in the constellation Cassiopeia. This open cluster was discovered in 1781 by Charles Messier's friend and collaborator Pierre Méchain. It is one of the most distant open clusters known, with distances of 8,000 to 9,500 light-years from the earth and ranging about 15 light-years apart. There are about 40 member stars within M103, two of which have magnitudes 10.5, and a 10.8 red giant, which is the brightest within the cluster. Observation of M103 is generally dominated by the appearance of Struve 131, though the star is not a member of the 172-star cluster. M103 is about 25 million years old.

NGC 581
Messier object 103.jpg
Observation data (J2000.0 epoch)
Right ascension 01 33.2
Declination +60° 42′
Distance 10 thousand light-years (3 kpc)
Apparent magnitude 7.4
Apparent dimensions 6.0'
Physical characteristics
Other designations M103
See also: Open cluster, List of open clusters

Messier 103 (also known as M103, or NGC 581) is an open cluster where a few thousand stars formed in the constellation Cassiopeia. This open cluster was discovered in 1781 by Charles Messier's friend and collaborator Pierre Méchain. It is one of the most distant open clusters known, with distances of 8,000 to 9,500 light-years from the earth and ranging about 15 light-years apart. There are about 40 member stars within M103, two of which have magnitudes 10.5, and a 10.8 red giant, which is the brightest within the cluster. Observation of M103 is generally dominated by the appearance of Struve 131, though the star is not a member of the 172-star cluster. M103 is about 25 million years old.

Star Hopping #37 - Find Messier 103, the ET Cluster, and Caroline's Rose

Get free Field Notes for this episode at http://kpobservatory.org/fieldnotes. In this episode of Star Hopping with Kissimmee Park Observatory, we'll look at the ...

Messier 103 : Video e Imagenes Personales , 19 Noviembre 2017 .

Hola a todos. Comparto con ustedes mis imagenes en vídeo de cielo profundo con El Cumulo Estelar Abierto : M 103 , es un cumulo localizado a un grado al ...

M 103 Open Star Cluster in Cassiopeia (24 July 2018)

Type: Open Star Cluster Local Τime 04:00 Greece Distance: 9786.0 Light Years Celestron Travel Scope 70/400 Portable Telescope SKYWATCHER Alt-Azimuth ...

Messier-M103.mpg

I think I fixed my PHD TOT below .66 at M103

I have a long history of PHD pulsing issues. My stars prior setup was looking like the letter Ws, and at times I could hear pulsing RA/DEC to over guiding. I have ...

Ep 22 Chapter 9 - PixInsight - Using the DeNoise Process

In this chapter I go through how I used the DeNoise process on M103 Open Cluster.