Messier 71

M 71
Kuglasti skup M71.
Otkriće
Položaj
Epoha J2000
Zviježđe Strijelica
Udaljenost 13,000 ly  (4,000 pc)
Rektascenzija 19h 53m 48.0s
Deklinacija +18° 47′ 00.0″
Izgled na našem nebu
Prividna magnituda 8.30
Prividne dimenzije (V) 6' x 6'
Stvarne osobine objekta
Ostalo
Druge oznake NGC 6838


Messier 71 (M71 ili NGC 6838), je kuglasti skup u zviježđu Strelica. M71 je otkrio Philippe Loys de Chéseaux 1745. ili 1746. godine. Pierre Méchain, suradnik Charlesa Messiera samostalno ga je otkrio 28. lipnja 1780. godine. Charles Messier ga je osobno promatrao u listopadu 1780. i dodao ga u svoj katalog kao 71. objekt. U zvijezda ga je prvi razlučio William Herschel 1783. godine.

Svojstva

M71 je poprilično rijedak kuglasti skup. Dugo vremena dio astronoma ga je klasificirao kao gusti otvoreni skup, sličan M11-u. 1943. godine izvršena je detaljna fotometrija skupa koja je potvrdila da se radi o kuglastom skupu, a ne otvorenom. Cijeli skup se približava nama brzinom od 23 km/s i sadrži tek 8 promjenjivih zvijezda.

M71 nalazi se na udaljenosti od 13,000 ly. Središta skupa ima promjer od 5 do 6', dok je promjer skupa na fotografijama oko 7'. Njegov prividan kutni promjer odgovara linearnom promjeru od samo 27 ly, što je poprilično malo za kuglasti skup. Tamniji članovi skupa otkriveni su unutar sfere promjera 24' ili 97 ly. Dali ti tamniji članovi pripadaju skupu još nije potvrđeno.

Amaterska promatranja

Skup M71 ima prividan sjaj od + 8.2 magnitude. Moguće ga je uočiti dvogledom jer se nalazi u povoljnom položaju za promatranje, posebno u kolovozu kada je u zenitu. Kroz 200 mm teleskop, kuglasti skup se prostire na 4' i može se uočiti 10 sjajnijih zvijezda. Skup se nalazi u središnjem pojasu Mliječne staze pa je na manjem povećanju okružen mnogobrojnim zvijezdama.

Vanjske veze

Skica M71


Objekti u Messierovom katalogu
M1M2M3M4M5M6M7M8M9M10M11M12M13M14M15M16M17M18M19M20M21M22M23M24M25M26M27M28M29M30M31M32M33M34M35M36M37M38M39M40M41M42M43M44M45M46M47M48M49M50M51M52M53M54M55M56M57M58M59M60M61M62M63M64M65M66M67M68M69M70M71M72M73M74M75M76M77M78M79M80M81M82M83M84M85M86M87M88M89M90M91M92M93M94M95M96M97M98M99M100M101M102M103M104M105M106M107M108M109M110

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