| M2 | |
 Globular Cluster Messier 2 from the 2MASS Survey. Observations for the Two Micron All-Sky Survey ( 2MASS) began in 1997 and were completed in 2001 at two Telescopes located one each in the northern and |
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| Observation data (J2000 epoch) | |
|---|---|
| Class | II |
| Constellation | Aquarius |
| Right ascension | 21h 33m 27s[1] |
| Declination | -00° 49′ 24″[1] |
| Distance | 37. 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 Aquarius ( Water -bearer or cup-bearer is the eleventh sign of the Zodiac, situated between Capricornus and Pisces. Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 5 kly (11. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 5 kpc) |
| Apparent magnitude (V) | +6. 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 3[1] |
| Apparent dimensions (V) | 16′. 0 |
| Physical characteristics | |
| Mass | kg ( M ) |
| Radius | 87. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. 3 ly [2] |
| Estimated age | 13 Gyr |
| Other designations | NGC 7089[1] |
| See also: Globular cluster, List of globular clusters | |
Messier 2 (also known as M2 or NGC 7089) is a globular cluster in the constellation Aquarius. 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 Aquarius ( Water -bearer or cup-bearer is the eleventh sign of the Zodiac, situated between Capricornus and Pisces. It was discovered by Jean-Dominique Maraldi in 1746. Giovanni Domenico ( Jean-Dominique) Maraldi ( April 17, 1709 – November 14, 1788) was an Italian -born Year 1746 ( MDCCXLVI) was a Common year starting on Saturday (link will display the full calendar of the Gregorian calendar (or a
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Discovery and visibility
M2 is, under extremely good conditions, just visible to the naked eye five degrees north of the star Beta Aquarii. A star is a massive luminous ball of plasma. The nearest star to Earth is the Sun, which is the source of most of the Energy on Earth Binoculars or small telescopes will identify this cluster as non-stellar while larger telescopes will resolve individual stars, of which the brightest are of apparent magnitude 13. A telescope is an instrument designed for the observation of remote objects and the collection of Electromagnetic radiation. 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 1.
M2 was discovered by the French astronomer Jean-Dominique Maraldi in 1746 when he was observing a comet with Jacques Cassini. This article is about the country For a topic outline on this subject see List of basic France topics. Giovanni Domenico ( Jean-Dominique) Maraldi ( April 17, 1709 – November 14, 1788) was an Italian -born Year 1746 ( MDCCXLVI) was a Common year starting on Saturday (link will display the full calendar of the Gregorian calendar (or a Jacques Cassini ( February 8, 1677 – April 18, 1756) was a French - Italian Astronomer, son of the famous Italian Charles Messier rediscovered it in 1760 and thought it a nebula without any stars associated with it. Charles Messier ( June 26, 1730 &ndash April 12, 1817) was a French astronomer most notable for publishing an Year 1760 ( MDCCLX) was a Leap year starting on Tuesday (link will display the full calendar of the Gregorian calendar (or a Leap William Herschel was the first to resolve individual stars in the cluster in 1794. Sir Frederick William Herschel FRS KH ( 15 November 1738 – 25 August 1822) was a German -born British Year 1794 ( MDCCXCIV) was a Common year starting on Wednesday (link will display the full calendar of the Gregorian calendar (or a
Scientific data
Spanning 175 light-years across, M2 is one of the larger globular clusters known. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by The cluster is rich, compact, and significantly elliptical.
At 13 billion years old it is also one of the older globulars associated with the Milky Way Galaxy. A year (from Old English gēr) is the time between two recurrences of an event related to the Orbit of the Earth around the Sun The Milky Way (a translation of the Latin Via Lactea, in turn derived from the Greek Γαλαξίας (Galaxias sometimes referred to simply The distance of M2 is about 37,500 light-years away from Earth and the cluster contains about 150,000 stars. EARTH was a short-lived Japanese vocal trio which released 6 singles and 1 album between 2000 and 2001
M2 has 21 known variable stars. Its brightest stars are red and yellow giants. The overall spectral type is F4. [1]
External links
References
- ^ a b c d e SIMBAD Astronomical Database. Results for NGC 7089. Retrieved on 2006-11-15. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 655 - Battle of Winwaed: Penda of Mercia is defeated by Oswiu of Northumbria.
- ^ distance × sin( diameter_angle / 2 ) = 87. 3 ly. radius
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