Messier Objects

M9: Globular Star Cluster (Ophiuchus) RA: 17h 19.2m / DEC: -18° 31'.0
Instrument: 10-inch Starfinder

Ophiuchus is home to seven globular clusters in the Messier catalog. You'll find this example about 3.5 degrees south-southeast of 2.4 magnitude Sabik. M9 stands magnification quite well. The view at 129X in my 10-inch Newtonian reveals a salty core region populated by several 13th magnitude stars in a tightly knit group. The subtle outer halo doubles the apparent size of M9 to about 8 arc minutes. The four brighter stars due east of M9 range from 9th to 12th magnitude. Two neighboring globulars, NGC 6356 and 6342, are fine targets for moderate aperture. M9's integrated visual magnitude is 7.8.


M8-Lagoon Nebula M10

line

Navigation Image, see text links below Web Links Glossary Sketching Astrophotography Planetary Observing Deep-sky Observing Getting Started About Cosmic Voyage Home

Home | About Cosmic Voyage | Getting Started | Deep-sky Observing | Planetary Observing | Astrophotography | Sketching | Glossary | Web Links

line

URL: http://www.cosmicvoyage.net
Layout, design & revisions © W. D. Ferris
Comments and Suggestions: wdferris1@gmail.com

Revised: February 15, 2002 [WDF]