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 17 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 Jacksonville , it is visible between 22:55 and 03:48. It will become accessible at around 22:55, when it rises to an altitude of 18° above your south-eastern horizon. It will reach its highest point in the sky at 01:21, 27° above your southern horizon. It will become inaccessible at around 03:48 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.
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 18 Jun 2031
| The sky on 18 June 2031 | ||||||||||||||||||||||||||||||||||
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1% 28 days old |
All times shown in EDT.
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Source
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)