|Other designations||1ES 1727-21.4|
|Spectral class||Ia |
|Date||8−9 October 1604|
|Right ascension||17h 30m 42s|
|Distance||20,000 light-years (6.1 kpc)|
|Progenitor||White Dwarf-RedGiant double star system|
|Progenitor type||Type Ia supernova|
|Notable features||Latest observed supernova
in our galaxy.
visibility for 18 months.
|Peak apparent magnitude||−2.25 to −2.5|
|Preceded by||SN 1572|
|Followed by||Cassiopeia A (unobserved, c. 1680), G1.9+0.3 (unobserved, c. 1868), SN 1885A (next observed)|
|Related media on Wikimedia Commons|
Supernova 1604, also known as Kepler's Supernova, Kepler's Nova or Kepler's Star, was a supernova of Type Ia that occurred in the Milky Way, in the constellation Ophiuchus. Appearing in 1604, it is the most recent supernova in our own galaxy to have been unquestionably observed by the naked eye, occurring no farther than 6 kiloparsecs or about 20,000 light-years from Earth.
The first recorded observation was in northern Italy on 9 October 1604. Johannes Kepler began observing the luminous display on October 17 while working at the imperial court in Prague for Emperor Rudolf II. It was subsequently named after him, even though he was not its first observer, as his observations tracked the object for an entire year and because of his book on the subject, entitled De Stella nova in pede Serpentarii ("On the new star in Ophiuchus's foot", Prague 1606).
The supernova was also recorded in Chinese and Korean sources.
It was the second supernova to be observed in a generation (after SN 1572 seen by Tycho Brahe in Cassiopeia). No further supernovae have since been observed with certainty in the Milky Way, though many others outside our galaxy have been seen since S Andromedae in 1885. SN 1987A in the Large Magellanic Cloud was easily visible to the naked eye.
Strong present day astronomical evidence exists for a Milky Way supernova whose signal would have reached Earth ca. 1680 (Cassiopeia A), and another (G1.9+0.3) whose light should have arrived ca. 1870. There is no historical record of either having been detected at the time, probably because absorption by interstellar dust made them fainter than they would otherwise have been.
- "Chandra X-Ray Observatory". Kepler's Supernova Remnant: A Star's Death Comes to Life. Retrieved 2006-01-16.
- Reynolds, S. P.; Borkowski, K. J.; Hwang, U.; Hughes, J. P.; Badenes, C.; Laming, J. M.; Blondin, J. M. (2007-10-02). "A Deep Chandra Observation of Kepler's Supernova Remnant: A Type Ia Event with Circumstellar Interaction". The Astrophysical Journal. 668 (2): L135–L138. Bibcode: . arXiv: . doi: .
- "Kepler's Supernova: Recently Observed Supernova". Universe for Facts. Retrieved 21 December 2014.
- Delle Colombe L., Discorso di Lodovico Delle Colombe nel quale si dimostra che la nuova Stella apparita l’Ottobre passato 1604 nel Sagittario non è Cometa, ne stella generata, ò creata di nuovo, ne apparente: ma una di quelle che furono da principio nel cielo; e ciò esser conforme alla vera Filosofia, Teologia, e Astronomiche dimostrazioni, Firenze, Giunti, 1606.
- "Bill Blair's Kepler's Supernova Remnant Page". Retrieved October 7, 2009.
- Stephenson, F. Richard & Green, David A., Historical Supernovae and their Remnants, Oxford, Clarendon Press, 2002, pp. 60–71.
- "Chandra X-Ray Observatory". Discovery of Most Recent Supernova in Our Galaxy, May 14, 2008. Retrieved 2012-05-02.
- Blair, William P.; Long, Knox S.; Vancura, Olaf (1991). "A detailed optical study of Kepler's supernova remnant". Astrophysical Journal. 366: 484–494. Bibcode: . doi: .
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