Messier 53
| Kugelsternhaufen Messier 53 | |
|---|---|
.jpg) | |
| SDSS | |
| AladinLite | |
| Sternbild | Haar der Berenike |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 13h 12m 55,2s [1] |
| Deklination | +18° 10′ 09″ [1] |
| Erscheinungsbild | |
| Konzentrationsklasse | V [2] |
| Helligkeit (visuell) | 7,7 mag [3] |
| Helligkeit (B-Band) | 8,95 mag [4] |
| Winkelausdehnung | 12,6′ [4] |
| Farbexzess E(B-V) (Rötung) | ca. 0,02 bis 0,08 |
| Physikalische Daten | |
| Zugehörigkeit | Milchstraße, galaktischer Halo |
| Integrierter Spektraltyp | F6 |
| Rotverschiebung | −0,000199 ± 0,000026 [4] |
| Entfernung | 60 kLj (18 kpc) [5] |
| Konzentration lg(rt/rc) | 1,78 |
| Alter | 13,25 ± 0,50 Mrd. Jahre |
| Metallizität [Fe/H] | ca. −2 |
| Geschichte | |
| Entdeckung | J. E. Bode |
| Entdeckungsdatum | 3. Februar 1775[6] |
| Katalogbezeichnungen | |
| M 53 • NGC 5024 • C 1310+184 • GCl 22 • | |
Messier 53 (auch als NGC 5024 bezeichnet) ist ein galaktischer Kugelsternhaufen im Sternbild Haar der Berenike mit einer scheinbaren Abmessung von 13′ und einer scheinbaren Helligkeit von 7,7 mag. Durch Analyse der RR-Lyrae-Veränderlichen in M53 wurde eine Entfernung von rund 18 kpc (ca. 60 kLj) bestimmt, sein Durchmesser beträgt rund 200 Lichtjahre.[7]
Weblinks
- Spektrum.de: Amateuraufnahmen [1]
- Spot the difference – Hubble spies another globular cluster, but with a secret
Einzelnachweise
- ↑ NASA/IPAC EXTRAGALACTIC DATABASE
- ↑ NED data for the Messier Objects
- ↑ SEDS: NGC 5024
- ↑ a b c SIMBAD
- ↑ Messier 53
- ↑ Seligman
- ↑ SuW 04.2016 S. 62f
Auf dieser Seite verwendete Medien
Autor/Urheber:
diverse
, Lizenz: CC-by 3.0Bildtafel der 110 Messier-Objekte.
Autor/Urheber: Sloan Digital Sky Survey, Lizenz: CC BY 4.0
Angle of view: 12' x 12' (0.3515625" per pixel), north is up.
Details on the image processing pipeline: https://www.sdss.org/dr14/imaging/jpg-images-on-skyserver/Autor/Urheber: ESA/Hubble & NASA, Lizenz: CC BY 3.0
Thousands and thousands of brilliant stars make up this globular cluster, Messier 53, captured with crystal clarity in this image from the NASA/ESA Hubble Space Telescope. Bound tightly by gravity, the cluster is roughly spherical and becomes denser towards its heart.
These enormous sparkling spheres are by no means rare, and over 150 exist in the Milky Way alone, including Messier 53. It lies on the outer edges of the galaxy, where many other globular clusters are found, almost equally distant from both the centre of our galaxy and the Sun. Although they are relatively common, the famous astronomer William Herschel, not at all known for his poetic nature, once described a globular cluster as “one of the most beautiful objects I remember to have seen in the heavens”, and it is clear to see why.
Globular clusters are much older and larger than open clusters, meaning they are generally expected to contain more old red stars and fewer massive blue stars. But Messier 53 has surprised astronomers with its unusual number of a type of star called blue stragglers.
These youngsters are rebelling against the theory of stellar evolution. All the stars in a globular cluster are expected to form around the same time, so they are expected follow a specific trend set by the age of the cluster and based on their mass. But blue stragglers don’t follow that rule; they appear to be brighter and more youthful than they have any right to be. Although their precise nature remains mysterious these unusual objects are probably formed by close encounters, possibly collisions, between stars in the crowded centres of globular clusters.
This picture was put together from visible and infrared exposures taken with the Wide Field Channel of Hubble's Advanced Camera for Surveys.The field of view is approximately 3.4 arcminutes across.