NGC 7250
| Galaxie NGC 7250 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Eidechse |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 22h 18m 17,8s[1] |
| Deklination | +40° 33′ 45″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | Sdm? / Sbrst[1] |
| Helligkeit (visuell) | 12,6 mag[2] |
| Helligkeit (B-Band) | 13,2 mag[2] |
| Winkelausdehnung | 1,7′ × 0,8′[2] |
| Positionswinkel | 157°[2] |
| Flächenhelligkeit | 12,8 mag/arcmin²[2] |
| Physikalische Daten | |
| Rotverschiebung | 0.003889 ± 0.000017[1] |
| Radialgeschwindigkeit | (1166 ± 5) km/s[1] |
| Hubbledistanz vrad / H0 | (62 ± 4) · 106 Lj (19,0 ± 1,3) Mpc [1] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 8. November 1790 |
| Katalogbezeichnungen | |
| NGC 7250 • UGC 11980 • PGC 68535 • CGCG 530-022 • MCG +07-45-024 • IRAS 22161+4018 • 2MASX J13053653-4330017 • GC 4778 • H III 864 • | |
NGC 7250 ist eine Spiralgalaxie vom Hubble-Typ Sd im Sternbild Eidechse. Sie ist rund 62 Millionen Lichtjahre von der Milchstraße entfernt.
Die Galaxie wurde am 8. November 1790 von dem Astronomen William Herschel mit seinem 18,7-Zoll-Spiegelteleskop entdeckt und später von Johan Dreyer in seinen New General Catalogue aufgenommen.[3]
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(c) ESA/Hubble, CC BY 4.0
A matter of distance
In space, being outshone is an occupational hazard. This NASA/ESA Hubble Space Telescope image captures a galaxy named NGC 7250. Despite being remarkable in its own right — it has bright bursts of star formation and recorded supernova explosions— it blends into the background somewhat thanks to the gloriously bright star hogging the limelight next to it.
This bright object is a single and little-studied star named TYC 3203-450-1, located in the constellation of Lacerta (The Lizard), much closer than the much more distant galaxy. Only this way a normal star can outshine an entire galaxy, consisting of billions of stars. Astronomers studying distant objects call these stars “foreground stars” and they are often not very happy about them, as their bright light is contaminating the faint light from the more distant and interesting objects they actually want to study. In this case TYC 3203-450-1 million times closer than NGC 7250 which lies over 45 million light-years away from us. Would the star be the same distance as NGC 7250, it would hardly be visible in this image.
Credit:
ESA/Hubble & NASA
Coordinates Position (RA): 22 18 18.99 Position (Dec): 40° 33' 9.73" Field of view: 2.71 x 2.71 arcminutes Orientation: North is 75.0° right of vertical Colours & filters Band Wavelength Telescope Optical Very Broad 350 nm Hubble Space Telescope WFC3 Optical V 555 nm Hubble Space Telescope WFC3 Infrared H 1.545 μm Hubble Space Telescope WFC3 Optical I 814 nm Hubble Space Telescope WFC3.