Messier 7 (Ptolemy's Cluster) - Open Cluster in Scorpius
Messier 7 is a Open Cluster in the Scorpius constellation. Messier 7 is situated south of the celestial equator and, as such, it is more easily visible from the southern hemisphere.
The image below is a photograph of Messier 7 from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.74x0.74 degrees (44.4x44.4 arcmins).
Key facts about Messier 7
Messier 7 is below the horizon from Greenwich, United Kingdom.
Altitude: -59.2°
Azimuth: 288.6°
Direction: West-North-West
See also Messier 7 rise and set times.
Given its visual magnitude of 3.3, Messier 7 is visible to the naked eye under a clear and dark sky, or with the help of a small binocular.
Photometric information of Messier 7
The following table lists the magnitude of Messier 7 in different bands of the electomagnetic spectrum (when available), from the B band (445nm wavelength, corresponding to the Blue color), to the V band ( 551nm wavelength, corresponding to Green/Yellow color), to the J, H, K bands (corresponding to 1220nm, 1630nm, 2190nm wavelengths respectively, which are colors not visible to the human eye).
For more information about photometry in astronomy, check the photometric system article on Wikipedia.
Apparent size of Messier 7
The following table reports Messier 7 apparent angular size. The green area displayed on top of the DSS2 image of Messier 7 is a visual representation of it.Celestial coordinates and finder chart of Messier 7
Celestial coordinates for the J2000 equinox of Messier 7 are provided in the following table:
The simplified sky charts below show the position of Messier 7 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.
Rise and set times of Messier 7 from your location
Location: Greenwich, United Kingdom
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London
Today's Messier 7 (Ptolemy's Cluster) - Open Cluster in Scorpius rise, transit and set times from Greenwich, United Kingdom are the following (all times relative to the local timezone Europe/London):