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M55 is well placed

Tuesday, 2018, July 17 - 01:00

Dominic Ford – originally published on

Across much of the world the globular cluster M55 (NGC 6809) in Sagittarius will be well placed for observation. It will reach its highest point in the sky at around midnight local time.

At a declination of -30°58', it is easiest to see from the southern hemisphere and cannot be seen from latitudes much north of 39°N.

From London (click to change), it will not be readily observable since it will lie so far south that it will never rise more than 7° above the horizon.

At magnitude 7.0, M55 is quite faint, and certainly not visible to the naked eye, but can be viewed through a pair of binoculars or small telescope.

The precise position of M55 is as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
M55 19h40m00s -30°58' Sagittarius 7.0 0'19"

The coordinates above are given in J2000.0.

The details of this observing event were provided courtesy of