Messier 75
Observation data (J2000 epoch)
Class	I
Constellation	Sagittarius
Right ascension	20h 06m 04. The Messier objects are a set of Astronomical objects first listed by French astronomer Charles Messier in his "Catalogue des Nébuleuses In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. In Astronomy, an epoch is a moment in time used as a reference for the Orbital elements of a Celestial body. The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for Globular clusters according to their concentration In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 75s[1]
Declination	-21° 55′ 16. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 2″[1]
Distance	67. 5 kly (20. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 7 kpc)
Apparent magnitude (V)	+9. History The first direct measurements of an object at interstellar distances were undertaken by German Astronomer Friedrich Wilhelm Bessel in 1838 The apparent magnitude ( m) of a celestial body is a measure of its Brightness as seen by an observer on Earth, normalized to the value 18[1]
Apparent dimensions (V)	6′. 8
Physical characteristics
Mass	kg ( M)
Radius	67 ly[2]
Other designations	M75, NGC 6864, GCl 116[1]
See also: Globular cluster, List of globular clusters
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Messier 75 (also known as M75 or NGC 6864) is a globular cluster in the constellation Sagittarius. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. The New General Catalogue ( NGC) is the best-known catalogue of Deep sky objects in Amateur astronomy. A globular cluster is a spherical collection of Stars that orbits a galactic core as a Satellite. This is a list of Globular clusters. The apparentmagnitude does not include an extinction correction A globular cluster is a spherical collection of Stars that orbits a galactic core as a Satellite. In common usage a constellation is a group of celestial bodies that are connected together in some arrangement typically stars to form a visible figure or picture It was discovered by Pierre Méchain in 1780 and included in Charles Messier's catalog of comet-like objects that same year. Pierre François André Méchain ( August 16, 1744 &ndash September 20, 1804) was a French Astronomer and surveyor Year 1780 ( MDCCLXXX) was a Leap year starting on Saturday (link will display the full calendar of the Gregorian calendar (or a Charles Messier ( June 26, 1730 &ndash April 12, 1817) was a French astronomer most notable for publishing an A comet is a small Solar System body that orbits the Sun and when close enough to the Sun exhibits a visible coma (atmosphere or a tail —

M75 is at a distance of about 67,500 light years away from Earth and its apparent size on the sky translates to a true radius of some 67 light years. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001 A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by It is classified as class I, meaning it is one of the more densely concentrated globular clusters known. The absolute magnitude of M75 is about -8. In Astronomy, absolute magnitude (also known as absolute visual magnitude) is the Apparent magnitude an object would have if it were at a standard 5 or some 180,000 more luminous than the Sun. Luminosity has different meanings in several different fields of science The Sun (Sol is the Star at the center of the Solar System.

External links

• Messier 75 @ SEDS Messier pages
• The Messier 75 on the WikiSky: DSS2, SDSS, IRAS, Hidrogen α, X-Ray, Astrophoto, Sky Map

References

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