| 词条 | NGC 3239 |
| 释义 |
|name=NGC 3239 |image=N3239s.jpg |image_size= |upright= |caption= Image of NGC 3239 (top center) as taken by the Mount Lemmon Sky Center, the bright spot inside the irregular galaxy is SN2012A |alt= |epoch=J2000 |constellation name=Leo |ra={{RA|10|25|06.24}}[1] |dec={{DEC|+17|09|37.8}}[1] |z= |h_radial_v= |gal_v= |dist_pc={{cvt|8.1|Mpc|Mly|order=flip|lk=on}}{{hub|0.73}} |dist_ly={{cvt|26.4|Mpc|Mly|order=flip|lk=on}}{{hub|0.73}} |group_cluster= |type=IB(s)mpec[1] |mass= |mass_light_ratio= |size= |stars= |appmag_v= |appmag_b=13.5[1] |absmag_v= |size_v= |half_light_radius_pc= |half_light_radius_arcminsec= |h1_scale_length_pc= |h1_scale_length_arcminsec= |xray_radius_pc= |xray_radius_arcminsec= |notes= |names={{odlist|name=Arp 263|PGC=30560|MCG=+03-27-025|UGC=5637}}[1] |references= }}NGC 3239 is an irregular galaxy in the constellation of Leo.[2] It is the host of SN 2012A, the first supernova of 2012.[3] The galaxy, which was discovered in 1784 by William Herschel[4], is part of the New Galactic Catalogue, and with an apparent magnitude of 13.5, is not visible to the naked eye.[2] It has been shown to have many HII regions, while also having some star formation regions. These signs are common in galactic mergers, which is why it is believed that NGC 3239 is the result of a galactic merger.[5] The supernova, SN 2012A, has been classified as a type IIP supernova, with a shorter plateau and non-constant luminosity.[6] References1. ^1 2 3 4 {{cite simbad|title=NGC 3239|accessdate=10 March 2019}} {{Ngc35}}{{Catalogs|NGC=3239|PGC=30560}}{{DEFAULTSORT:NGC 3239}}{{galaxy-stub}}2. ^1 {{Cite web|url=https://in-the-sky.org/data/object.php?id=NGC3239|title=The galaxy NGC 3239 - In-The-Sky.org|last=Ford|first=Dominic|website=in-the-sky.org|language=en|access-date=2019-03-09}} 3. ^{{Cite web|url=https://apod.nasa.gov/apod/ap120127.html|title=APOD: 2012 January 27 - NGC 3239 and SN 2012A|website=apod.nasa.gov|access-date=2019-03-09}} 4. ^{{Cite web|url=https://cseligman.com/text/atlas/ngc32.htm#3239|title=New General Catalog Objects: NGC 3200 - 3249|website=cseligman.com|access-date=2019-03-12}} 5. ^{{Cite web|url=http://adsbit.harvard.edu//full/1990PASP..102...41K/0000041.000.html|title=1990PASP..102...41K Page 41|website=adsbit.harvard.edu|access-date=2019-03-09}} 6. ^{{Cite journal|last=|first=|date=|title=Comparison of progenitor mass estimates for the type IIP SN 2012A|url=https://arxiv.org/pdf/1305.5789.pdf|journal=Monthly Notices of the Royal Astronomy Society|volume=|pages=1|via=arxiv}} 6 : Leo (constellation)|Irregular galaxies|Arp objects|NGC objects|Astronomical objects discovered in 1784|Discoveries by William Herschel |
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