NGC 6541

NGC 6541
Ilustracja
NGC 6541 (HST)
Odkrywca

Niccolò Cacciatore

Data odkrycia

19 marca 1826

Dane obserwacyjne (J2000)
Gwiazdozbiór

Korona Południowa

Typ

kulista, III

Rektascensja

18h 08m 02,36s[1]

Deklinacja

–43° 42′ 53,6″[1]

Odległość

24,5 tys. ly (7,5 kpc[1])

Jasność obserwowana

6,30 m[1]

Rozmiar kątowy

15,0'

Charakterystyka fizyczna
Jasność absolutna

–8,52 m[1]

Alternatywne oznaczenia
GCL 86, ESO 280-SC4

NGC 6541 (również GCL 86 lub ESO 280-SC4) – gromada kulista znajdująca się w gwiazdozbiorze Korony Południowej. Odkrył ją Niccolò Cacciatore 19 marca 1826 roku[2]. Jest położona w odległości ok. 24,5 tys. lat świetlnych od Słońca oraz 6850 lat świetlnych od centrum Galaktyki[1].

Zobacz też

Przypisy

  1. ↑ a b c d e f William E. Harris: Katalog gromad kulistych Drogi Mlecznej 1996 (rewizja 2010). [dostęp 2014-10-29].
  2. ↑ Courtney Seligman: NGC 6541. [w:] Celestial Atlas [on-line]. [dostęp 2014-10-29]. (ang.).

Linki zewnętrzne

Media użyte na tej stronie

Caldwell 78 (50291821361).jpg
Autor: NASA Hubble Space Telescope, Licencja: CC BY 2.0

The globular star cluster Caldwell 78, also known as NGC 6541, was first observed in the year 1826. The Italian astronomer Niccolò Cacciatore and the Scottish astronomer James Dunlop discovered the cluster independently within just a few months of each other.

Caldwell 78 is best observed from equatorial latitudes in the Northern Hemisphere during the summer and from the Southern Hemisphere during the winter. The cluster has an apparent magnitude of 6.3 and is located in the constellation Corona Australis, roughly 22,000 light-years from Earth. The cluster can be spotted with binoculars, but will dazzle in a small telescope. A larger telescope will resolve some of the cluster’s individual stars.

Traditionally, astronomers believed that globular clusters were made up of stars that have both similar ages and similar chemical abundances. However, recent studies suggest that this simplistic view is not always true. It seems as though many globular clusters contain stars with different chemical abundances relative to one another (or “multiple populations”), suggesting the stars formed at different times.

This image of Caldwell 78 is a composite of observations taken in visible and ultraviolet light by Hubble’s Wide Field Camera 3. These observations were made to better characterize the cluster’s stellar populations.

Credit: NASA, ESA, and G. Piotto (Università degli Studi di Padova); Processing: Gladys Kober (NASA/Catholic University of America)

For Hubble's Caldwell catalog website and information on how to find these objects in the night sky, visit: <a href="https://www.nasa.gov/content/goddard/hubble-s-caldwell-catalog" rel="noreferrer nofollow">www.nasa.gov/content/goddard/hubble-s-caldwell-catalog</a>