Mgławica Trójlistna Koniczyna
 Mgławica Trójlistna Koniczyna (ESO) | |
| Odkrywca | |
|---|---|
| Data odkrycia | 5 czerwca 1764 |
| Dane obserwacyjne (J2000) | |
| Gwiazdozbiór | |
| Typ | |
| Rektascensja | 18h 02m 32s |
| Deklinacja | –23° 01′ 48″ |
| Odległość | 2200-9000 ly |
| Jasność pozorna mgławicy | +6,3m |
| Rozmiary kątowe | 28’ |
| Charakterystyka fizyczna | |
| Alternatywne oznaczenia | |
| Messier 20, M20, NGC 6514, Sharpless 2-30, RCW 147, Gum 76 | |
 Gwiazdozbiór Strzelca | |
Mgławica Trójlistna Koniczyna (znana również jako Messier 20, M20 lub NGC 6514) – mgławica emisyjna (również obszar H II[1]) powiązana z gromadą otwartą, znajdująca się w gwiazdozbiorze Strzelca. Została odkryta 5 czerwca 1764 roku przez Charles’a Messiera.
Odległość M20 do Ziemi nie jest dokładnie znana, szacuje się ją na od 2,2 do 9 tysięcy lat świetlnych. Na niebie zajmuje obszar o średnicy 28 minut łukowych. Jej jasność to około 9m.
Mgławica ta jest obszarem gwiazdotwórczym[1]. Powiązana z nią gromada otwarta nosi oznaczenie C 1759-230 lub OCl 23[2]. Mgławica jest jonizowana przez gwiazdę wielokrotną HD 164492[3].
Jedna z najbardziej fotogenicznych mgławic na naszym niebie. Pasmo mgły o średnicy równej połowie średnicy Księżyca, pocięte na trzy części, które powodują jej wyjątkowy wygląd[4].
Mgławica Trójlistna Koniczyna
Dżet w M20 (fragment zdjęcia po lewej)
M20 w podczerwieni
Zobacz też
Przypisy
- ↑ a b B. Lefloch, J. Cernicharo, J. R. Pardo. Star formation in the Trifid Nebula. „Astronomy & Astrophysics”. 489 (1), s. 157-171, październik 2008. DOI: 10.1051/0004-6361:200810079 (ang.).
- ↑ Mgławica Trójlistna Koniczyna w bazie SIMBAD (ang.)
- ↑ Kevin Jardine: Sh 2-30 (ang.). W: Galaxy Map [on-line]. [dostęp 2015-11-04].
- ↑ Praca zbiorowa: KOSMOS. Warszawa: Buchmann Sp. z o.o., 2012, s. 444-447. ISBN 978-83-7670-323-7.
Bibliografia
- Messier 20 w SEDS.org (ang.)
- Mgławica Trójlistna Koniczyna w bazie SIMBAD (ang.)
Media użyte na tej stronie
ABOUT THIS IMAGE:
This NASA Hubble Space Telescope image of the Trifid Nebula reveals a stellar nursery being torn apart by radiation from a nearby, massive star. The picture also provides a peek at embryonic stars forming within an ill-fated cloud of dust and gas, which is destined to be eaten away by the glare from the massive neighbor. This stellar activity is a beautiful example of how the life cycles of stars like our Sun is intimately connected with their more powerful siblings.
The Hubble image shows a small part of a dense cloud of dust and gas, a stellar nursery full of embryonic stars. This cloud is about 8 light-years away from the nebula's central star, which is beyond the top of this picture. Located about 9,000 light-years from Earth, the Trifid resides in the constellation Sagittarius.
A stellar jet [the thin, wispy object pointing to the upper left] protrudes from the head of a dense cloud and extends three-quarters of a light-year into the nebula. The jet's source is a very young stellar object that lies buried within the cloud. Jets such as this are the exhaust gases of star formation. Radiation from the massive star at the center of the nebula is making the gas in the jet glow, just as it causes the rest of the nebula to glow.
The jet in the Trifid is a "ticker tape," telling the history of one particular young stellar object that is continuing to grow as its gravity draws in gas from its surroundings. But this particular ticker tape will not run for much longer. Within the next 10,000 years the glare from the central, massive star will continue to erode the nebula, overrunning the forming star, and bringing its growth to an abrupt and possibly premature end.
Another nearby star may have already faced this fate. The Hubble picture shows a "stalk" [the finger-like object] pointing from the head of the dense cloud directly toward the star that powers the Trifid. This stalk is a prominent example of the evaporating gaseous globules, or "EGGs," that were seen previously in the Eagle Nebula, another star-forming region photographed by Hubble. The stalk has survived because at its tip there is a knot of gas that is dense enough to resist being eaten away by the powerful radiation.
Reflected starlight at the tip of the EGG may be due to light from the Trifid's central star, or from a young stellar object buried within the EGG. Similarly, a tiny spike of emission pointing outward from the EGG looks like a small stellar jet. Hubble astronomers are tentatively interpreting this jet as the last gasp from a star that was cut off from its supply lines 100,000 years ago.
The images were taken Sept. 8, 1997 through filters that isolate emission from hydrogen atoms, ionized sulfur atoms, and doubly ionized oxygen atoms. The images were combined in a single color composite picture. While the resulting picture is not true color, it is suggestive of what a human eye might see.
Object Name: Trifid Nebula
Image Type: Astronomical
Credit: NASA and Jeff Hester (Arizona State University)Autor: Original uploader was Blueshade at pl.wikipedia, Licencja: CC-BY-SA-3.0
Ta mapa gwiazdozbioru została stworzona przy pomocy programu PP3 autorstwa Torstena Brongera. Tłumaczenia na język polski oraz innych modyfikacji na potrzeby polskiej Wikipedii dokonał Przemysław 'BlueShade' Idzkiewicz. Grafika udostępniona jest na licencji GFDL w wersji 1.2 lub nowszej.
Autor: ESO, Licencja: CC BY 4.0
The massive star factory known as the Trifid Nebula was captured in all its glory with the Wide-Field Imager camera attached to the MPG/ESO 2.2-metre telescope at ESO’s La Silla Observatory in northern Chile. So named for the dark dust bands that trisect its glowing heart, the Trifid Nebula is a rare combination of three nebulae types that reveal the fury of freshly formed stars and point to more star birth in the future. The field of view of the image is approximately 13 x 17 arcminutes.
The Trifid Nebula, aka M20, is easy to find with a small telescope and a well-known stop in the nebula rich constellation Sagittarius. But where visible light pictures show the nebula divided into three parts by dark, obscuring dust lanes, this penetrating infrared image reveals filaments of luminous gas and newborn stars.