47 Tucanae
47 Tucanae- Image mosaic by E. Kopan (IPAC). (Field size 19. 2´ × 23. 3´. )
Observation data (J2000 epoch)
Class	III
Constellation	Tucana
Right ascension	00h 24m 05. 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 Tucana is also an alternate name for the Tucano language. Tucana (tuːˈkɑːnə/ /-ˈkeɪnə/ /-ˈkænə ' Toucan ' is a southern Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 67s[1]
Declination	-72° 04′ 52. In Astronomy, declination (abbrev dec or δ) is one of the two coordinates of the Equatorial coordinate system, the other being either 6″[1]
Distance	13. 4 ± ? kly (4. A light-year or light year (symbol ly) is a unit of Length, equal to just under ten trillion Kilometres As defined by 1 ± ? kpc)
Apparent magnitude (V)	+4. 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 91[1]
Apparent dimensions (V)	30′. 9
Physical characteristics
Mass	kg (? M)
Radius	60 ± ? ly[2]
VHB	14. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. 2
Estimated age	~ 10 Billion Years
Notable features	2nd brightest globular cluster after Omega Centauri
Other designations	NGC 104, GCl 1[1]
See also: Globular cluster, List of globular clusters
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47 Tucanae (NGC 104) or just 47 Tuc is a globular cluster located in the constellation Tucana. 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 Tucana is also an alternate name for the Tucano language. Tucana (tuːˈkɑːnə/ /-ˈkeɪnə/ /-ˈkænə ' Toucan ' is a southern It is about 13,400 light years away from Earth, and 120 light years across. 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 It can be seen with the naked eye, and it is bright enough to earn a Flamsteed designation with a visual magnitude of 4. The naked eye is a Figure of speech referring to human Visual perception that is unaided by enhancing equipment such as a Telescope or Flamsteed designations for Stars are similar to Bayer designations except that they use numbers instead of Greek letters 0. It is one of only a small number of features in the southern sky with such a designation.

47 Tucanae was discovered by Nicolas Louis de Lacaille in 1751, its southern location having hidden it from European observers until then. Abbé Nicolas Louis de Lacaille ( March 15, 1713 &ndash March 21, 1762) was a French Astronomer. Year 1751 ( MDCCLI) was a Common year starting on Friday (link will display the full calendar of the Gregorian calendar (or a The cluster appears roughly the size of the full moon in the sky under ideal conditions.

It is the second brightest globular cluster in the sky (after Omega Centauri), and is noted for having a very bright and dense core. Omega Centauri or NGC 5139 is a Globular cluster of Stars seen in the constellation of Centaurus, discovered by Edmond Halley in It has 22 known millisecond pulsars, and at least 21 blue stragglers near the core. A millisecond pulsar ( MSP) often referred to as "recycled pulsar", is a Pulsar with a rotational period in the range of about 1-10 Milliseconds Blue stragglers ( BSS) are Stars in open or Globular clusters that are hotter and bluer than other cluster stars having the same Luminosity ^[3]

47 Tucanae is included in Sir Patrick Moore's Caldwell catalogue as C106. Sir Alfred Patrick Caldwell-Moore, CBE, HonFRS, FRAS (born 4 March 1923 in Pinner) known as Patrick Moore, is The Caldwell Catalogue is an Astronomical catalog of 109 bright Star clusters Nebulae and Galaxies

NGC 104 competes with NGC 5139 for the title: Most splendid Globular Cluster in the sky. NGC 104 has two features in it's favour. It's rounder and has a more compact core. However due to location more observers go for NGC 5139.

See also

• Mass Migration: How Stars Move in Crowd -- research indicates that 47 Tucanae sorts stars by mass

References

External links

• 47 Tucanae at the ESA-Hubble website

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