NGC 6633 is well placed

2017 Jun 27

Dominic Ford – originally published on

The open star cluster NGC 6633 in Ophiuchus will be well placed for observation. It will reach its highest point in the sky at around midnight local time.

At a declination of +06°34', it is visible across much of the world; it can be seen at latitudes between 76°N and 63°S.

From London (click to change), it will be visible all night. It will become visible at around 23:40 (BST) as the dusk sky fades, 42° above your south-eastern horizon. It will be lost to dawn twilight at around 02:28, 41° above your south-western horizon.

At magnitude 4.6, NGC6633 is too faint to be seen with the naked eye from any but the very darkest sites, but is visible through a pair of binoculars or small telescope.

The precise position of NGC6633 is as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
NGC6633 18h27m40s +06°34' Ophiuchus 4.6 0'27"

The coordinates above are given in J2000.0.

The details of this observing event were provided courtesy of