Jul 4
SN 1054, the Crab Supernova, is a supernova that was first observed on c.β10 July [O.S. c.β4 July] 1054, and remained visible until c.β12 April [O.S. c.β6 April] 1056.
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SN 1054, the Crab Supernova, is a supernova that was first observed on c.β10 July [O.S. c.β4 July] 1054, and remained visible until c.β12 April [O.S. c.β6 April] 1056.
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NCG 298, CETUS
3C 58 or 3C58 is a pulsar (designation PSR J0205+6449) and supernova remnant (pulsar wind nebula) within the Milky Way. The object is listed as No. 58 in the Third Cambridge Catalogue of Radio Sources.
It is located 2Β° northeast of Ξ΅ Cassiopeiae and is estimated to be 10,000 light-years away. Its rotation period is 65.715 ms (so PSR J0205+6449 does not belong to the class of millisecond pulsars).
The pulsar is notable for its very high rate of cooling, which is unexplained by standard models of neutron star formation. It is hypothesized that extreme conditions in the star's interior cause a high neutrino flux, which carries away the energy so that the star cools. 3C 58 has been proposed as a possible quark star (or strange star).
Westerlund 1 W26 (commonly abbreviated to W26) or Westerlund 1 BKS AS is a red supergiant or hypergiant (RSG or RHG) star located at the outskirts of the Westerlund 1 super star cluster. It is one of the largest known stars and the most luminous supergiant stars discovered so far, with radius calculated to be in excess of a thousand times the solar radius, and a luminosity of over 200,000 times the solar luminosity. If placed at the center of the Solar System, its photosphere would engulf the orbit of Jupiter.
Messier 77 (M77), also known as NGC 1068 or the Squid Galaxy
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Minkowski 2-9, abbreviated M2-9 (also known as Minkowski's Butterfly, Twin Jet Nebula or the Wings of a Butterfly Nebula) "M2-9: Wings of a Butterfly Nebula" Credit: B. Balick (U. Washington) et al., WFPC2, HST, NASA
