Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

Messier 17 (Horseshoe Nebula) - Nebula

Messier 17 is a Nebula in the Sagittarius constellation. Messier 17 is situated close to the celestial equator and, as such, it is at least partly visible from both hemispheres in certain times of the year.

Messier 17
Nebula
Sagittarius
Available Resources for Messier 17 (Horseshoe Nebula) - Nebula

Photometric information of Messier 17

The following table lists the magnitude of Messier 17 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).

6
7

For more information about photometry in astronomy, check the photometric system article on Wikipedia.

Apparent size of Messier 17

The following table reports Messier 17 apparent angular size. The green area displayed on top of the DSS2 image of Messier 17 is a visual representation of it.
12.6 arcmin
12.6 arcmin

Digitized Sky Survey image of Messier 17

The image below is a photograph of Messier 17 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 0.42x0.42 degrees (25.2x25.2 arcmins).

Image of Messier 17 (Horseshoe Nebula) - Nebula star
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DSS2 image of Messier 17 in the Red band. The green region on the image is a representation of the major (12.6 arcmin) and minor (12.6 arcmin) axes of the object's apparent size.

Celestial coordinates and finder chart of Messier 17

Celestial coordinates for the J2000 equinox of Messier 17 are provided in the following table:

18h 20m 47s
-16° 10’ 18”

The simplified sky charts below show the position of Messier 17 in the sky. The first chart has a field of view of 60° while the second one has a field of view of 10°.

Finder chart Messier 17 (Horseshoe Nebula) - Nebula star
Simplified finder chart for Messier 17 (Horseshoe Nebula) - Nebula.

Finder chart Messier 17 (Horseshoe Nebula) - Nebula star
Simplified finder chart for Messier 17 (Horseshoe Nebula) - Nebula.

Rise ans set times of Messier 17 from your location

Location: Greenwich, United Kingdom [change]
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

Today's Messier 17 (Horseshoe Nebula) - Nebula rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 106.2°
Max altitude: 22.3°
Azimuth: 253.8°
Messier 17 (Horseshoe Nebula) - Nebula is below the horizon from Greenwich, United Kingdom