NGC 7380
{{Short description|Open cluster in the constellation Cepheus}}
{{Infobox open cluster
| name = NGC 7380
| image = 300px
| caption = NGC 7380 in classic Hubble Palette (Ha/OIII/SII) by amateur astronomer Chuck Ayoub
| constellation = Cepheus
| epoch = J2000.0
| class =
| dist_ly = {{convert|2.6|±|0.4|kpc|kly|order=flip|abbr=on|lk=on}}
| dist_pc =
| appmag_v = 7.2
| size_v = 25{{prime}}
| mass_msol =
| radius_ly = ~{{convert|6|pc|ly|order=flip|abbr=on|lk=on}}
| v_hb =
| age = 4 to 11.9 Myr
| notes =
| names = {{odlist | NGC=7380 }}, Sh2-142, Cr 452
}}
NGC 7380 is a young open cluster of stars in the northern circumpolar constellation of Cepheus, discovered by Caroline Herschel in 1787. The surrounding emission nebulosity is known colloquially as the Wizard Nebula, which spans an angle of {{val|25|ul=arcminute}}. German-born astronomer William Herschel included his sister's discovery in his catalog, and labelled it H VIII.77. The nebula is known as S 142 in the 1959 Sharpless catalog (Sh2-142). It is extremely difficult to observe visually, usually requiring very dark skies and an O-III filter. The NGC 7380 complex is located at a distance of approximately {{convert|2.6|kpc|kly|disp=out|abbr=off|lk=on}} from the Sun, in the Perseus Arm of the Milky Way.
The cluster spans ~{{convert|6|pc|ly|order=flip}} with an elongated shape and an extended tail. Age estimates range from 4 to 11.9 million years. At the center of the cluster lies DH Cephei, a close, double-lined spectroscopic binary system consisting of two massive O-type stars. This pair are the primary ionizing source for the surrounding H II region, and are driving out the surrounding gas and dust while triggering star formation in the neighboring region. Of the variable stars that have been identified in the cluster, 14 have been identified as pre-main sequence stars while 17 are main sequence stars that are primarily B-type variables.
Gallery
File:SH2-142HunterWilson.jpg|NGC 7380 in Hubble Palette (Ha/OIII/SII)
File:The Wizard Nebula.jpg|NGC 7380 from WISE.
File:NGC7380 Nebula from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg|NGC 7380 from the Mount Lemmon SkyCenter using the 0.8m Schulman Telescope.Broadband (RGB) image.
File:NGC7380_Nebula_from_South_Common_Observatory_courtesy_Richie_Jarvis.jpg|NGC7380 Nebula from South Common Observatory
References
{{reflist|refs=
| title=NGC 7380 | access-date=2020-10-18 | postscript=. }}
| title=A Kinematic and Photometric Study of the Galactic Young Star Cluster NGC 7380
| display-authors=1 | last1=Chen | first1=W. P.
| last2=Pandey | first2=A. K. | last3=Sharma | first3=Saurabh
| last4=Chen | first4=C. W. | last5=Chen | first5=Li
| last6=Sperauskas | first6=J. | last7=Ogura | first7=K.
| last8=Chuang | first8=R. J. | last9=Boyle | first9=R. P.
| journal=The Astronomical Journal | postscript=.
| volume=142 | issue=3 | id=71 | pages=15 | date=September 2011
| doi=10.1088/0004-6256/142/3/71 | bibcode=2011AJ....142...71C | s2cid=120469041 | doi-access=free }}
| title=Variable stars in young open star cluster NGC 7380
| last1=Lata | first1=Sneh | last2=Pandey | first2=A. K.
| last3=Panwar | first3=Neelam | last4=Chen | first4=W. P.
| last5=Samal | first5=M. R. | last6=Pandey | first6=J. C.
| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society
| volume=456 | issue=3 | pages=2505–2517 | date=March 2016
| arxiv=1511.08892 | bibcode=2016MNRAS.456.2505L
| doi=10.1093/mnras/stv2800 | doi-access=free | s2cid=118473907 | postscript=. }}
| title=The orbits of open clusters in the Galaxy
| last1=Wu | first1=Zhen-Yu | last2=Zhou | first2=Xu
| last3=Ma | first3=Jun | last4=Du | first4=Cui-Hua
| display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society
| volume=399 | issue=4 | pages=2146–2164 | date=November 2009
| bibcode=2009MNRAS.399.2146W |arxiv = 0909.3737
| doi=10.1111/j.1365-2966.2009.15416.x | doi-access=free
| s2cid=6066790
}}
}}
External links
{{commonscat}}
- {{WikiSky}}
- [https://web.archive.org/web/20161003105357/http://nebul.ae/component/joomgallery/nebula/ngc7380-wizard-nebula.html South Common Observatory - Images of the Wizard Nebula]
- [http://apod.nasa.gov/apod/ap111102.html NASA APOD mentioning the Wizard Nebula]
- [http://messier.seds.org/xtra/ngc/n7380.html SEDS] – NGC 7380
{{Sky|22|47|00|+|58|06|00|7200}}
{{Sh2 objects}}
{{Ngc75}}
{{Cepheus (constellation)}}
{{DEFAULTSORT:Ngc 7380}}