{{ Supernova
| name = SN 2011dh
| image=
| caption =
| epoch = J2000
| SNRtype =
| type = IIb
| ra =
| dec =
| iauc =
| mag_v = 12.1
| distance =
| progenitor = ?
| progenitor_type = 黄超巨星？。該前身星可能是原始質量18到24倍太陽質量的高光度黃超巨星。該超新星於同年6月19日達到最高亮度12.1等。一般預測在一個星系內大約每四十年會有一顆超新星。
觀測
因為有許多業餘觀測者的觀測活動，這顆超新星SN 2011dh很難被忽略。2011年6月25日起它的星等保持在12.7一段時間。雖然它的光度是肉眼可見下限6.5等星的三百分之一，它在黑暗的夜空中仍是搭載了新式CCD的業餘望遠鏡容易觀測的目標。
參考資料
外部連結
- [http://www.backyardastronomer.com/SN/m51_sn_2011_1.gif GIF animation of pre and post images of SN 2011dh]
- [http://asterisk.apod.com/viewtopic.php?f=29&t=23856 Views of the developing supernova]
- [http://astro.berkeley.edu/~weidong/m51sn.prog.gif SN 2011dh progenitor?]
- [https://web.archive.org/web/20111007095421/http://www.digitalsky.org.uk/DSO/2011-06-02_M51L300002.jpg Magnitude comparison 2011-06-02]
- [http://news.discovery.com/space/twitter-helps-astronomers-zero-in-on-m51-supernova-110606.html Twitter Helps Astronomers Zero-In on M51 Supernova] (Jun 6, 2011 Ian O'Neill)
- [https://web.archive.org/web/20111001235614/http://lcogt.net/en/observations/ogg/2m0a/58956 M51 (Whirlpool Galaxy)] at Las Cumbres Observatory on 6 Jun 2011
- [http://astroblogger.blogspot.com/2011/06/supernova-sn2011dh-in-m51-is.html Supernova sn2011dh in M51 is brightening!] (June 14, 2011 Ian Musgrave)
- [http://arxiv.org/abs/1106.3551 PTF11eon/SN2011dh: Discovery of a Type IIb Supernova From a Compact Progenitor in the Nearby Galaxy M51] (arXiv:1106.3551 : 17 Jun 2011)
- [http://arxiv.org/abs/1107.1876 Panchromatic Observations of SN 2011dh Point to a Compact Progenitor Star] (arXiv:1107.1876 : 10 Jul 2011)
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