Sagittarius (constellation)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Sagittarius
Sagittarius
Click for larger image
List of stars in Sagittarius
Abbreviation: Sgr
Genitive: Sagittarii
Symbology:
Right ascension: 19 h
Declination: −25°
Area: 867 sq. deg. (15th)
Main stars: 12, 8
Bayer/Flamsteed stars: 68
Stars known to have planets: 25
Bright stars: 7
Nearby stars: 2
Brightest star: ε Sgr (Kaus Australis) (1.79m)
Nearest star: Ross 154 ( ly)
Messier objects: 15
Meteor showers:
Bordering constellations:
Visible at latitudes between +55° and −90°
Best visible at 21:00 (9 p.m.) during the month of August
An image showing Sagittarius.
Messier 54 was the first globular cluster found outside the Milky Way

The constellation Sagittarius ('The Archer') is a group of stars in one area of the night sky. The stars are in the shape of a centaur archer. This constellation is part of the Western zodiac.

The Milky Way is at its densest near Sagittarius, as this is where the galactic center lies. Consequently, Sagittarius contains many star clusters and nebulae. One of the brightest of the star clusters is Messier 55, about 7.5° west of δ Sgr.[1]

The complex radio source Sagittarius A is here. Astronomers believe that one of its components, known as Sagittarius A*, is associated with a supermassive black hole at the center of the galaxy, with a mass of 2.6 million solar masses.[1]

Deep-sky objects[change | change source]

Trifid Nebula
NGC 6559
Omega Nebula

References[change | change source]

  1. 1.0 1.1 Levy, David H. 2005. Deep sky objects. Prometheus Books. ISBN 978-1-59102-361-6