NGC 6902

Galaxie
NGC 6902 / IC 4948
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NGC 6902 aufgenommen durch SPECULOOS[1]
AladinLite
SternbildSchütze
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension20h 24m 28,1s[2]
Deklination−43° 39′ 13″[2]
Erscheinungsbild
Morphologischer TypSA(r)b / LINER[3]
Helligkeit (visuell)10,9 mag[3]
Helligkeit (B-Band)11,8 mag[3]
Winkel­ausdehnung5,6′ × 3,9′[3]
Positionswinkel153°[3]
Flächen­helligkeit14.1 mag/arcmin²[3]
Physikalische Daten
ZugehörigkeitSSRS Gruppe 37
NGC 6902-Gruppe
LGG 434[2][4]
Rotverschiebung0,009326 ± 0,000013[2]
Radial­geschwin­digkeit(2796 ± 4) km/s[2]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(125 ± 9) · 106 Lj
(38,2 ± 2,7) Mpc [2]
Geschichte
EntdeckungJohn Herschel
Entdeckungsdatum2. September 1836
Katalogbezeichnungen
NGC 6902 • IC 4948 • PGC 64632 • ESO 285-008 • MCG -07-42-002 • IRAS 20210-4348 • 2MASX J20242813-4339127 • SGC 202102-4348.9 • AM 2021-434 • GALEXMSC J202427.84-433915.5 • LDCE 1394 NED004

NGC 6902 = IC 4948 ist eine Balken-Spiralgalaxie mit aktivem Galaxienkern vom Hubble-Typ SBa im Sternbild Schütze auf der Ekliptik. Sie ist schätzungsweise 125 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 210.000 Lichtjahren.

Gemeinsam mit IC 4946 und PGC 64580 (NGC 6902B) bildet sie die kleine NGC 6902-Gruppe oder LGG 434.

Das Objekt wurde am 2. September 1836 vom britischen Astronomen John Herschel entdeckt (als NGC-Objekt aufgeführt).[5]

  • Aufnahme des Zentrums mittels VLT

    Aufnahme des Zentrums mittels VLT

  • UV-Aufnahme mittels GALEX

    UV-Aufnahme mittels GALEX

NGC 6902-Gruppe (LGG 434)

GalaxieAlternativnameEntfernung/Mio. Lj
NGC 6902PGC 64632125
IC 4946PGC 64614129
PGC 64580NGC 6902B132

Weblinks

Einzelnachweise

  1. ↑ Aladin Lite
  2. ↑ a b c d NASA/IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e f SEDS: NGC 6902
  4. ↑ VizieR
  5. ↑ Seligman

Auf dieser Seite verwendete Medien

NGC6902 - Potw2106a.tiff
Autor/Urheber: (Credit) ESO/TIMER survey, Lizenz: CC BY 4.0
Zooming in on Star Formation


Discovered in the year 1836 by John Herschel, NGC 6902 is a beautiful spiral galaxy located more than 130 million light-years away in the constellation of Sagittarius, the Archer. This image was taken with MUSE, the Multi Unit Spectroscopic Explorer instrument attached to one of the four 8.2-metre telescopes that make up the VLT, and shows the galaxy from a unique perspective. A zoom in towards the galaxy’s centre, the image shows a nuclear ring where the orange glow of intense star formation is visible.

Inside this ring lies a faint and small bar of stars. Researchers found that stars within it are distributed differently depending on their age, with younger stars aligned along the bar and older stars more dispersed. These locations of the young and old stars within the central bar of NGC 6902 confirm predictions made years earlier from simulations and models. This is the first time these predictions of galactic structure were confirmed with observations thanks to the incredible spatial resolution of the MUSE instrument.

Credit:

ESO/TIMER survey 

Coordinates
Position (RA):   	20 24 28.17
Position (Dec): 	-43° 39' 13.25"
Field of view:   	1.06 x 1.09 arcminutes
Orientation:     	North is 0.1° right of vertical

Colours & filters      Band	Telescope
Optical B        	438 nm	Very Large Telescope MUSE
Optical g        	475 nm	Very Large Telescope MUSE
Optical r        	625 nm	Very Large Telescope MUSE
Optical H-alpha  	656 nm	Very Large Telescope MUSE
Optical N II     	658 nm	Very Large Telescope MUSE
.
NGC 6902 GALEX WikiSky.jpg
NGC 6902 galaxy by GALEX
NGC6902 - ESO - Potw1908a.jpg
Autor/Urheber: ESO, Lizenz: CC BY 4.0
NGC 6902 Caught by SPECULOOS

This Picture of the Week is a special treat: a first-light image from the newest resident of ESO’s Paranal Observatory, the SPECULOOS Southern Observatory. This planet-hunting machine aims to observe nearby but dim stars to locate exoplanets for other telescopes — such as ESO’s forthcoming Extremely Large Telescope (ELT) — to study in detail. Comprising four one-metre telescopes, each named after one of Jupiter’s Galilean moons, SPECULOOS promises to open up new frontiers in exoplanet research.

This image, however, is obviously not of a faint star, but of a galaxy called NGC 6902. Before a telescope starts its primary mission it must successfully undertake an event called “first light”: the first time it is used for a scientific observation. Astronomers typically pick well-known objects for this initial test of a telescope’s capabilities, which is half demonstration and half celebration. In this case, the team settled on NGC 6902 as the first-light target for the Ganymede telescope.

The result was this stunning image of the spiral galaxy, which is found about 120 million light-years from Earth in the constellation of Sagittarius (The Archer). The galaxy’s spiral arms swirl outwards from a bright centre until they dissolve into streams of blue haze at the galaxy’s edge. If this is what Ganymede can produce as its first observation of something it wasn’t even designed to image, we have a lot to look forward to. Watch this space!

Credit:

ESO 

Coordinates
Position (RA): 	20 24 28.51
Position (Dec):	-43° 39' 3.59"
Field of view: 	10.62 x 10.64 arcminutes
Orientation:   	North is 0.2° left of vertical
.