M 71 – Sge

M 71

M71

Globular clusters are famous for their high concentration of stars: even one million stars closely packed together by gravity. But sometimes we find significantly loose bodies, making them like a dense open cluster.

This is the case of Messier 71 (more data),a wonderful, bright globular cluster with a shape sitting between globular and open clusters. Discovered by Philippe Loys de Chéseaux in 1745-1746, M 71 has been a puzzling object up to 1970’s, suggesting contrasting classifications and observations. Now, modern photometry provided evidence for it to be a globular cluster.

The image above is the average of 15, 120-seconds exposures, remotely taken with the PlaneWave 17 robotic unit part of the Virtual Telescope Project. All images were unguided. Image scale is about 0.7″/pixel.

 

Back to “Star Clusters” page

 

 

Support The Virtual Telescope Project!

If everyone reading this right now would donate something, our fundraiser would be done in a few days. Please, donate and receive an exclusive, LIMITED EDITION image of potentially hazardous asteroids taken by the Virtual Telescope, specifically made for supporters like you!

donate now (you can adjust the amount later)

 

Comments

comments

You may also like...

Leave a Reply

Your email address will not be published.

Follow

Get every new post on this blog delivered to your Inbox.

Join other followers: