NGC 5468
| Galaxie NGC 5468 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Jungfrau |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 14h 06m 34,9s[1] |
| Deklination | −05° 27′ 11″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | SAB(rs)cd[1] |
| Helligkeit (visuell) | 12,5 mag[2] |
| Helligkeit (B-Band) | 13,2 mag[2] |
| Winkelausdehnung | 2,4′ × 2,3′[2] |
| Positionswinkel | 105°[2] |
| Flächenhelligkeit | 14,2 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | LGG 374[1][3] |
| Rotverschiebung | 0.009480 ± 0.000013[1] |
| Radialgeschwindigkeit | (2842 ± 4) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (125 ± 9) · 106 Lj (38,3 ± 2,7) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 5. März 1785 |
| Katalogbezeichnungen | |
| NGC 5468 • UGCA 384 • PGC 50323 • MCG -01-36-007 • IRAS 14039-0512 • 2MASX J14063487-0527113 • GC 3777 • H III 286 • h 1745 • HIPASS J1406-05 • LDCE 1026 NED005 | |
NGC 5468 ist eine Balken-Spiralgalaxie vom Hubble-Typ SAB(rs)cd im Sternbild Jungfrau. Sie ist schätzungsweise 125 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 90.000 Lj.
Das Objekt wurde am 5. März 1785 von dem Astronomen William Herschel mithilfe seines 18,7-Zoll-Spiegelteleskops entdeckt.[4]
(c) NASA, ESA, CSA, STScI, A. Riess (JHU/STScI), CC BY 4.0Kombinierte Aufnahme im sichtbaren Licht und Infrarot, erstellt mithilfe des James Webb-Weltraumteleskops und des Hubble-Weltraumteleskops
Weblinks
- NGC 5468. SIMBAD, abgerufen am 6. März 2016 (englisch).
- NGC 5468. DSO Browser, abgerufen am 6. März 2016 (englisch).
- A Dramatic Demise
Einzelnachweise
Auf dieser Seite verwendete Medien
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(c) NASA, ESA, CSA, STScI, A. Riess (JHU/STScI), CC BY 4.0
This image of NGC 5468, a galaxy located about 130 million light-years from Earth, combines data from the Hubble and James Webb space telescopes. This is the most distant galaxy in which Hubble has identified Cepheid variable stars. These are important milepost markers for measuring the expansion rate of the Universe. The distance calculated from Cepheids has been cross-correlated with a Type Ia supernova in the galaxy. Type Ia supernovae are so bright they are used to measure cosmic distances far beyond the range of the Cepheids, extending measurements of the Universe’s expansion rate deeper into space.[Image description: A face-on spiral galaxy with four spiral arms that curve outward in a counterclockwise direction. The spiral arms are filled with young, blue stars and peppered with purplish star-forming regions that appear as small blobs. The middle of the galaxy is much brighter and more yellowish, and has a distinct narrow linear bar angled from 11 o’clock to 5 o’clock. Dozens of red background galaxies are scattered across the image. The background of space is black.]
(c) ESA/Hubble, CC BY 4.0
Some of the most dramatic events in the Universe occur when certain stars die — and explode catastrophically in the process.
Such explosions, known as supernovae, mainly occur in a couple of ways: either a massive star depletes its fuel at the end of its life, become dynamically unstable and unable to support its bulk, collapses inwards, and then violently explodes; or a white dwarf in an orbiting stellar couple syphons more mass off its companion than it is able to support, igniting runaway nuclear fusion in its core and beginning the supernova process. Both types result in an intensely bright object in the sky that can rival the light of a whole galaxy.
In the last 20 years the galaxy NGC 5468, visible in this image, has hosted a number of observed supernovae of both the aforementioned types: SN 1999cp, SN 2002cr, SN2002ed, SN2005P, and SN2018dfg. Despite being just over 130 million light-years away, the orientation of the galaxy with respect to us makes it easier to spot these new ‘stars’ as they appear; we see NGC 5468 face on, meaning we can see the galaxy’s loose, open spiral pattern in beautiful detail in images such as this one from the NASA/ESA Hubble Space Telescope.