Did you get a chance to check out the IYA Live Telescope? Our last object was Messier 50 (also known as M 50 or NGC 2323) is an open cluster in the constellation Monoceros. It was perhaps discovered by G. D. Cassini before 1711 and independently discovered by Charles Messier in 1772. M50 is at a distance of about 3,000 light-years away from Earth. It is described as a ‘heart-shaped’ figure. You’ll find the video inside!

Open cluster Messier 50 (M50, NGC 2323) is a pretty and considerably bright object located in a rich part of stars and nebulae in constellation Monoceros, near its border to Canis Major. It is easily seen in binoculars and well resolved in even a small telescope.

This cluster was discovered on April 5, 1772 by Charles Messier, but possibly G.D. Cassini had already discovered it before 1711, according to a report by his son, Jacques Cassini, in his book of 1740, Elements of Astronomy.

Open cluster M50 is probably about 3,200 light years distant. Its angular diameter of about 15×20′ therefore corresponds to a linear extension of about 20 light-years, the central dense part being only about 10′ or 10 light-years in diameter. J.E. Gore, from photographic plates taken by Isaac Roberts in 1893, has estimated its population as about 200 stars in the main body. The cluster’s Trumpler type is given as I,2,m (Glyn Jones), II,3,m (Sky Catalog 2000) or II,3,r (Götz). The visual appearance is described as a “heart-shaped figure” by Mallas and Kreimer.

According to Kenneth Glyn Jones, the brightest star is of spectral type B8 and mag 9.0, while the Sky Catalog 2000 gives spectral type B6 and mag 7.85, and the age is estimated as 78 million years. 7′ south of the center is a red M giant, contrasting prominently against its blue-white neighbor stars. The cluster also contains some yellow giants.

Tammy Plotner

Tammy was a professional astronomy author, President Emeritus of Warren Rupp Observatory and retired Astronomical League Executive Secretary. She’s received a vast number of astronomy achievement and observing awards, including the Great Lakes Astronomy Achievement Award, RG Wright Service Award and the first woman astronomer to achieve Comet Hunter's Gold Status. (Tammy passed away in early 2015... she will be missed)

Share
Published by
Tammy Plotner

Recent Posts

Here’s How to Weigh Gigantic Filaments of Dark Matter

How do you weigh one of the largest objects in the entire universe? Very carefully,…

2 hours ago

How Could Astronauts Call for Help from the Moon?

Exploring the Moon poses significant risks, with its extreme environment and hazardous terrain presenting numerous…

14 hours ago

There Was a 15 Minute Warning Before Tonga Volcano Exploded

Volcanoes are not restricted to the land, there are many undersea versions. One such undersea…

14 hours ago

Main Sequence and White Dwarf Binaries are Hiding in Plain Sight

Some binary stars are unusual. They contain a main sequence star like our Sun, while…

16 hours ago

What a Misplaced Meteorite Told Us About Mars

11 million years ago, Mars was a frigid, dry, dead world, just like it is…

18 hours ago

Uranus is Getting Colder and Now We Know Why

Uranus is an oddball among the Solar System's planets. While most planets' axis of rotation…

21 hours ago