NGC 4833 - Citizendia

Observation data (J2000 epoch)
NGC 4833
Class	VIII
Constellation	Musca
Right ascension	12^h 59^m 34. The New General Catalogue ( NGC) is the best-known catalogue of Deep sky objects in Amateur astronomy. 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 Musca (ˈmʌskə Fly) is one of the minor southern Constellations The constellation was one of twelve constellations created by Pieter Dirkszoon Keyser Right ascension (abbrev RA; symbol α) is the Astronomical term for one of the two Coordinates of a point on the Celestial sphere 98^s^[1]
Declination	-70° 52′ 28. 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	21. 2 kly (6. 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)	+7. 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 79^[1]
Apparent dimensions (V)	13′. 5
Physical characteristics
Mass	kg ( M)
Radius	42 ly^[2]
Estimated age	15 Gyr
Other designations	GCl 21,^[1] Lacaille I. The solar mass is a standard way to express Mass in Astronomy, used to describe the masses of other Stars and galaxies. 4 Dunlop 164, Bennett 56
See also: Globular cluster, List of globular clusters
This box: view • talk • edit

NGC 4833 is a globular cluster discovered by Abbe Lacaille during his 1751-1752 journey to South Africa, and catalogued in 1755. 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. Abbé Nicolas Louis de Lacaille ( March 15, 1713 &ndash March 21, 1762) was a French Astronomer. It was subsequently observed and catalogued by James Dunlop and Sir John Herschel whose instruments could resolve it into individual stars. James Dunlop ( 31 October 1793 – 22 September 1848) was an Astronomer assistant hired by Sir Thomas Brisbane at his private Sir John Frederick William Herschel 1st Baronet KH, FRS ( March 7, 1792 &ndash May 11, 1871)was an

The globular cluster is situated in the very southerly constellation Musca at a distance of 21,200 light years from earth. Musca (ˈmʌskə Fly) is one of the minor southern Constellations The constellation was one of twelve constellations created by Pieter Dirkszoon Keyser 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 partially obscured by a dusty region of the galactic plane. After corrections for the reddening by dust, evidence was obtained that it is in the order of 2 billion years older than globular clusters M5 or M92. Globular Cluster M5 (also known as Messier Object 5 or NGC 5904) is a Globular cluster in the Constellation Serpens.

References

^ ^a ^b ^c ^d SIMBAD Astronomical Database. Results for NGC 4833. Retrieved on 2006-11-17. Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Events 284 - Diocletian is proclaimed emperor by his soldiers
^ distance × sin( diameter_angle / 2 ) = 42 ly. radius

CCD Photometry of the Globular Cluster NGC 4833 and Extinction Near the Galactic Plane, Melbourne et al, 25 September 2000, Astrophysics Journal

References

External links

See also