NGC 4019
| Galaxie NGC 4019 / IC 755 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Haar der Berenike |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 12h 01m 10,420s [1] |
| Deklination | +14° 06′ 15,50″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | SBb? / sp[1] |
| Helligkeit (visuell) | 13,2 mag[2] |
| Helligkeit (B-Band) | 14,0 mag[2] |
| Winkelausdehnung | 2,40′ × 0,3′[2] |
| Positionswinkel | 145°[2] |
| Flächenhelligkeit | 12,7 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 4486-Gruppe LGG 289[1][3] |
| Rotverschiebung | 0,005126 ± 0,000006[1] |
| Radialgeschwindigkeit | (1537 ± 2) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (66 ± 5) · 106 Lj (20,2 ± 1,4) Mpc [1] |
| Durchmesser | 45.000 Lj[4] |
| Geschichte | |
| Entdeckung | John Herschel |
| Entdeckungsdatum | 23. April 1832 |
| Katalogbezeichnungen | |
| NGC 4019 • IC 755 • UGC 7001 • PGC 37912 • CGCG 069-024 • MCG +02-31-014 • IRAS 11585+1423 • KUG 1158+143A • 2MASX J12011038+1406162 • EVCC 76 • HIPASS J1201+14 • NSA 140612 • WISEA J120110.44+140615.7 | |
NGC 4019 = IC 755 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBb im Sternbild Haar der Berenike am Nordsternhimmel. Sie ist schätzungsweise 65 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 45.000 Lichtjahren. Gemeinsam mit 95 weiteren Galaxien bildet sie die NGC-4486-Gruppe (LGG 289).
Im selben Himmelsareal befinden sich die Galaxien NGC 3996 und NGC 4037.
Die Typ-II-Supernova SN 1999an wurde hier beobachtet.[5]
Das Objekt wurde im Jahr 1832 von dem britischen Astronomen John Herschel mit einem 18,7-Zoll-Teleskop entdeckt. Der Eintrag im Index Catalogue bezieht sich auf eine Beobachtung der vermutlich gleichen Galaxie durch den US-amerikanischen Astronomen Lewis Swift.[6]
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Autor/Urheber: ESA/Hubble & NASA, Lizenz: CC BY 3.0
The NASA/ESA Hubble Space Telescope has imaged an elongated stream of stars, gas and dust called IC 755, which is actually a spiral galaxy that we are seeing edge-on.
In 1999 a star within IC 755 was seen to explode as a supernova and named SN 1999an. The supernova was discovered by the Beijing Astronomical Observatory Supernova Survey and three years later Hubble was used to study the environment in which the explosion took place. The inclination of the galaxy made the supernova a challenging target as many other intervening objects obscured the view. Valuable data were obtained and suggest that before detonation the star may have been around 20 times more massive than our Sun, and that it was likely to have been in the region of 14 million years old.
Supernovae like SN 1999an are classified as Type IIs and they are dramatic events that mark the end of the lives of massive stars. They have an important role to play in galaxy evolution as many elements are formed during the explosion and are ejected with such force that they are distributed far and wide. Shockwaves also help to mix material within the host galaxy and may spark new rounds of star formation. Billions of stars make up galaxies like IC 755 and many will become supernovae, using their final moments to breathe new life into the rest of the Universe.
This picture was created from multiple images taken with the Wide Field Camera of Hubble’s Advanced Camera for Surveys. Exposures through a blue filter (F435W) are coloured blue, exposures through a yellow-green filter (F555W) are coloured green and images through a near-infrared filter (F814W) are shown as red. The total exposure times per filter are 430 s and the field of view is 3.3 x 1.5 arcminutes.
Cross Identifications: NGC 4019, IC 755, UGC 7001, MCG 2-31-14, PGC 37912, FGC 1347, IRAS11585+1423, ZWG 69.24 (Revised NGC Data for NGC 4019)