Messier 72
| Kugelsternhaufen Messier 72 | |
|---|---|
.jpg) (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des zentralen Bereichs (3' × 3') mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Wassermann |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 20h 53m 27,9s [1] |
| Deklination | −12° 32′ 13″ [1] |
| Erscheinungsbild | |
| Konzentrationsklasse | IX [2] |
| Helligkeit (visuell) | 9,3 mag [3] |
| Helligkeit (B-Band) | 9,95 mag [1] |
| Winkelausdehnung | 6,6′ [3] |
| Physikalische Daten | |
| Zugehörigkeit | Milchstraße |
| Integrierter Spektraltyp | F7 |
| Rotverschiebung | −0,000960 ± 0,000030 |
| Radialgeschwindigkeit | (−289 ± 8) km/s |
| Entfernung | ca. 55.000 Lj [3] |
| Durchmesser | 106 Lj [3] |
| Geschichte | |
| Entdeckung | Pierre Méchain |
| Entdeckungsdatum | 30. August 1780[4] |
| Katalogbezeichnungen | |
| M 72 • NGC 6981 • C 2050-127 • GCl 118 • GC 4608 • | |
Messier 72 (auch als NGC 6981 bezeichnet) ist ein 9,3 mag heller Kugelsternhaufen mit einer Winkelausdehnung von 6,6′ im Sternbild Wassermann.
Erforschung
M72 wurde von dem französischen Astronomen Pierre Méchain am 29. August 1780 entdeckt, gut einem Monat bevor auch Charles Messier ihn beobachtete und ihn namensprägend als 72-sten Eintrag in seinem Katalog aufnahm.[5] Beide klassifizierten ihn in dem damals dominaten Schemen als Nebel und nicht als Sternhaufen. Anhand der Beobachtungen mit seinem leistungsstärkeren Teleskop beschrieb ihn der englische Astronom John Herschel dann als "cluster of stars of a round figure".[6]
Weblinks
- M72 – ein Kugelsternhaufen – Astronomy Picture of the Day vom 12. Mai 2010.
- Messier 72, a celestial city from above
- A glittering cluster shines again (engl.)
Einzelnachweise
- ↑ a b SIMBAD
- ↑ NED Daten zu Messier 72
- ↑ a b c d Messier 72 bei SEDS
- ↑ Seligman
- ↑ Robert A. Garfinkle: Star-Hopping: Your Visa to Viewing the Universe. Cambridge University Press, 1997, ISBN 978-0-521-59889-7, S. 266 (englisch, google.com).
- ↑ Robert Burnham: Burnham's Celestial Handbook: An Observer's Guide to the Universe Beyond the Solar System (= Dover Books on Astronomy Series. Band 1). 2nd Auflage. Courier Dover Publications, 1978, ISBN 978-0-486-23567-7, S. 188–189 (englisch, google.com).
Auf dieser Seite verwendete Medien
A glittering cluster shines again (potw2516a).jpg
(c) ESA/Hubble, CC BY 4.0
As part of ESA/Hubble’s 35th anniversary celebrations, a new image series has been shared throughout April to revisit stunning Hubble targets that were previously released. New images of NGC 346, the Sombrero Galaxy, and the Eagle Nebula have already been published. Now, ESA/Hubble is revisiting the star cluster Messier 72 (M72) with new data and image processing techniques.M72 is a particularly special target because it was the first image ever published in the ESA/Hubble Picture of the Week series, on 22 April 2010. For fifteen years, the ESA/Hubble team has been publishing a new Hubble image every Monday for everyone to enjoy. This has resulted in nearly 800 images being added to the vast Hubble image archive over the years.M72 is a collection of stars, formally known as a globular cluster, located in the constellation Aquarius roughly 50 000 light years from Earth. The intense gravitational attraction between the closely packed stars gives globular clusters their regular, spherical shape. Roughly 150 clusters such as this have been discovered in the Milky Way galaxy.The striking variety in the colour of the stars in this image of M72, particularly compared to the original image, results from adding ultraviolet observations to the previous visible-light data. The colours indicate groups of different types of stars. Blue stars are those in the cluster that were originally more massive, and have now reached hotter temperatures after burning through much of their hydrogen fuel; the bright red objects are lower-mass stars that have now become red giants. Studying these different groups help astronomers to understand how globular clusters, and the galaxies they were born in, initially formed. Pierre Méchain, a French astronomer and colleague of Charles Messier, discovered M72 in 1780. It was the first of five star clusters that Méchain would discover while assisting Messier. It was recorded as the 72nd entry in Messier’s famous collection of astronomical objects, and the object is also one of the most remote clusters in the catalogue.The ESA/Hubble science outreach team invites members of the public as well as all scientists who have had (or will have) approved Hubble observing time to contact us if you feel you have aesthetically appealing yet visually informative image data that could be featured in this series![Image Description: A cluster of many thousands of bright stars. In the centre most of the stars are blue, while this centre is surrounded by a thick shell of yellower stars, seen in differing sizes according to their position in the spherical star cluster. They spread out beyond the edges of the image, becoming smaller and more sparse only at the corners. A distant spiral galaxy is also visible in the very corner.]
(c) ESA/Hubble, CC BY 4.0
As part of ESA/Hubble’s 35th anniversary celebrations, a new image series has been shared throughout April to revisit stunning Hubble targets that were previously released. New images of NGC 346, the Sombrero Galaxy, and the Eagle Nebula have already been published. Now, ESA/Hubble is revisiting the star cluster Messier 72 (M72) with new data and image processing techniques.M72 is a particularly special target because it was the first image ever published in the ESA/Hubble Picture of the Week series, on 22 April 2010. For fifteen years, the ESA/Hubble team has been publishing a new Hubble image every Monday for everyone to enjoy. This has resulted in nearly 800 images being added to the vast Hubble image archive over the years.M72 is a collection of stars, formally known as a globular cluster, located in the constellation Aquarius roughly 50 000 light years from Earth. The intense gravitational attraction between the closely packed stars gives globular clusters their regular, spherical shape. Roughly 150 clusters such as this have been discovered in the Milky Way galaxy.The striking variety in the colour of the stars in this image of M72, particularly compared to the original image, results from adding ultraviolet observations to the previous visible-light data. The colours indicate groups of different types of stars. Blue stars are those in the cluster that were originally more massive, and have now reached hotter temperatures after burning through much of their hydrogen fuel; the bright red objects are lower-mass stars that have now become red giants. Studying these different groups help astronomers to understand how globular clusters, and the galaxies they were born in, initially formed. Pierre Méchain, a French astronomer and colleague of Charles Messier, discovered M72 in 1780. It was the first of five star clusters that Méchain would discover while assisting Messier. It was recorded as the 72nd entry in Messier’s famous collection of astronomical objects, and the object is also one of the most remote clusters in the catalogue.The ESA/Hubble science outreach team invites members of the public as well as all scientists who have had (or will have) approved Hubble observing time to contact us if you feel you have aesthetically appealing yet visually informative image data that could be featured in this series![Image Description: A cluster of many thousands of bright stars. In the centre most of the stars are blue, while this centre is surrounded by a thick shell of yellower stars, seen in differing sizes according to their position in the spherical star cluster. They spread out beyond the edges of the image, becoming smaller and more sparse only at the corners. A distant spiral galaxy is also visible in the very corner.]
Bildtafel Messierobjekte.jpg
Bildtafel der 110 Messier-Objekte. Diese Datei wird in der w:de:Template:Navigationsleiste Messierobjekte als Imagemap genutzt. Sie darf daher nicht durch eine andere Version überschrieben werden!
Bildtafel der 110 Messier-Objekte. Diese Datei wird in der w:de:Template:Navigationsleiste Messierobjekte als Imagemap genutzt. Sie darf daher nicht durch eine andere Version überschrieben werden!
