© Digitised Sky Survey (DSS); Second Palomar Observatory Sky Survey (POSS-II)

The Butterfly cluster is well placed

Dominic Ford, Editor
From the Deep Sky feed

Objects: M6
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The Butterfly open star cluster (M6, NGC 6405; mag 4.2) in Scorpius will be well placed in the evening sky in coming weeks. On 16 June it will reach its highest point in the sky at around midnight local time, and on subsequent evenings it will culminate four minutes earlier each day.

From San Diego , it is visible between 22:41 and 02:56. It will become accessible at around 22:41, when it rises to an altitude of 18° above your south-eastern horizon. It will reach its highest point in the sky at 00:48, 25° above your southern horizon. It will become inaccessible at around 02:56 when it sinks below 18° above your south-western horizon.

At a declination of 32°15'S, it is easiest to see from the southern hemisphere but cannot be seen from latitudes much north of 37°N.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

At magnitude 4.2, M6 is tricky to make out with the naked eye except from a dark site, but is visible through a pair of binoculars or small telescope.

The position of M6 is as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
M6 17h40m20s 32°15'S Scorpius 4.2 0'00"

The coordinates above are given in J2000.0.

The sky on 16 Jun 2024

The sky on 16 June 2024
Twilight ends
Twilight begins

10-day old moon
Waxing Gibbous


10 days old

Rise Culm. Set
Mercury 05:47 12:59 20:10
Venus 05:53 13:02 20:11
Moon 15:06 20:47 02:22
Mars 02:45 09:20 15:55
Jupiter 04:19 11:18 18:16
Saturn 00:42 06:29 12:16
All times shown in PDT.


The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

Image credit

© Digitised Sky Survey (DSS); Second Palomar Observatory Sky Survey (POSS-II)


San Diego



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