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- SN_393 abstract "SN 393 is the modern supernova designation for an astronomical event that was reported by the Chinese in the year 393 CE. The extracted record was translated into English as follows:A guest star appeared within the asterism Wěi during the second lunar month of the 18th year of the Tai-Yuan reign period, and disappeared during the ninth lunar month.The second lunar month mentioned in the record corresponds to the period February 27 to March 28, 393 CE, while the ninth lunar month ran from October 22 to November 19, 393 CE. The bowl-shaped asterism named Wěi is formed by the tail of the modern constellation Scorpius. This asterism consists of the stars in Scorpius designated ε, μ, ζ, η, θ, ι, κ, λ and ν. The guest star reached an estimated apparent magnitude of −1 and was visible for about eight months before fading from sight. The duration of this event suggests the source was a supernova, which is a cataclysmic explosion of a star.When the material from a supernova explosion is ejected from the star, it sweeps up the surrounding interstellar material and creates an expanding supernova remnant of gas and plasma. In 1975, there were only seven known supernova remnants in the region of the sky where SN 393 was observed. On the basis of the peak magnitude, supernova SN 393 was initially estimated to have occurred at a distance close to 10,000 pc (33,000 ly). This requirement ruled out all but three of the candidates. Of the remainder, the first, G350.0-1.8 has an estimated age of 8,000 years; too old to be the remnant of SN 393. The two remaining sources, G348.5+0.1 and G348.7+0.3 are located at a suitable distance of about 10 kpc and have an estimated age of 1,500 years. However, because this supernova occurred along the dusty galactic plane, it is difficult to explain how it could have been observed with the naked eye from a distance of 10 kpc for a period of eight months.In 1996, the ROSAT All Sky Survey discovered a new supernova remnant in this area of the sky: RX J1713.7-3946. Two years later, it was suggested that this might be a better match for SN 393. Observations in 1999 suggested that this remnant is associated with the H II region G347.611 +0.204, which is at a distance of 6,000 pc (20,000 ly). However, in 2003, examination of the interaction between this cloud and a molecular cloud resulted in a closer distance of 1,000 pc (3,000 ly). This estimate was strengthened by a 2004 study of the X-ray and neutral hydrogen absorption by matter between the remnant and the Earth. Given the remnant's angular size of 70 arcminutes on the sky, at this distance it has a physical diameter of 20 pc (65 ly).The supernova remnant RX J1713.7-3946 is consistent with a type II or type Ib supernova explosion of a star with an initial mass at least 15 solar masses. The explosion generated an energy of about 1.3 × 1051 erg, ejecting three solar masses of material into the surrounding interstellar medium.".
- SN_393 thumbnail Scorpius_constellation_map.png?width=300.
- SN_393 wikiPageID "32435807".
- SN_393 wikiPageLength "7824".
- SN_393 wikiPageOutDegree "51".
- SN_393 wikiPageRevisionID "704934641".
- SN_393 wikiPageWikiLink 393.
- SN_393 wikiPageWikiLink Angular_diameter.
- SN_393 wikiPageWikiLink Apparent_magnitude.
- SN_393 wikiPageWikiLink Asterism_(astronomy).
- SN_393 wikiPageWikiLink Book_of_Song.
- SN_393 wikiPageWikiLink Category:393.
- SN_393 wikiPageWikiLink Category:4th-century_natural_events.
- SN_393 wikiPageWikiLink Category:Astronomical_objects_discovered_in_the_4th_century.
- SN_393 wikiPageWikiLink Category:Scorpius_(constellation).
- SN_393 wikiPageWikiLink Category:Supernova_remnants.
- SN_393 wikiPageWikiLink Category:Supernovae.
- SN_393 wikiPageWikiLink Chinese_astronomy.
- SN_393 wikiPageWikiLink Chinese_constellations.
- SN_393 wikiPageWikiLink Constellation.
- SN_393 wikiPageWikiLink Cosmic_distance_ladder.
- SN_393 wikiPageWikiLink Declination.
- SN_393 wikiPageWikiLink Emperor_Xiaowu_of_Jin.
- SN_393 wikiPageWikiLink Epsilon_Scorpii.
- SN_393 wikiPageWikiLink Erg.
- SN_393 wikiPageWikiLink Eta_Scorpii.
- SN_393 wikiPageWikiLink Galactic_coordinate_system.
- SN_393 wikiPageWikiLink Galaxy.
- SN_393 wikiPageWikiLink Guest_star_(astronomy).
- SN_393 wikiPageWikiLink H_II_region.
- SN_393 wikiPageWikiLink Interstellar_medium.
- SN_393 wikiPageWikiLink Iota_Scorpii.
- SN_393 wikiPageWikiLink Kappa_Scorpii.
- SN_393 wikiPageWikiLink Lambda_Scorpii.
- SN_393 wikiPageWikiLink Milky_Way.
- SN_393 wikiPageWikiLink Minute_and_second_of_arc.
- SN_393 wikiPageWikiLink Molecular_cloud.
- SN_393 wikiPageWikiLink Mu_Scorpii.
- SN_393 wikiPageWikiLink Nu_Scorpii.
- SN_393 wikiPageWikiLink ROSAT.
- SN_393 wikiPageWikiLink RX_J1713.7-3946.
- SN_393 wikiPageWikiLink Right_ascension.
- SN_393 wikiPageWikiLink Scorpius.
- SN_393 wikiPageWikiLink Shen_Yue.
- SN_393 wikiPageWikiLink Solar_mass.
- SN_393 wikiPageWikiLink Supernova.
- SN_393 wikiPageWikiLink Supernova_remnant.
- SN_393 wikiPageWikiLink Theta_Scorpii.
- SN_393 wikiPageWikiLink Type_II_supernova.
- SN_393 wikiPageWikiLink Type_Ib_and_Ic_supernovae.
- SN_393 wikiPageWikiLink Zeta_Scorpii.
- SN_393 wikiPageWikiLink File:Scorpius_constellation_map.png.
- SN_393 wikiPageWikiLinkText "SN 393".
- SN_393 wikiPageWikiLinkText "SN 393".
- SN_393 above "SN 393".
- SN_393 abovestyle "background: #ABCDEF;".
- SN_393 belowstyle "background: #ABCDEF;".
- SN_393 caption "The Wěi asterism appears in the lower half of the Scorpius constellation".
- SN_393 data Milky_Way.
- SN_393 data Scorpius.
- SN_393 data "393".
- SN_393 data "G347.4−00.6°".
- SN_393 data "Shell".
- SN_393 data "Type II/Ib".
- SN_393 data "−1".
- SN_393 header "Observation data".
- SN_393 headerstyle "background: #ABCDEF;".
- SN_393 label Constellation.
- SN_393 label Cosmic_distance_ladder.
- SN_393 label Declination.
- SN_393 label Galactic_coordinate_system.
- SN_393 label Galaxy.
- SN_393 label Right_ascension.
- SN_393 label Supernova.
- SN_393 label Supernova_remnant.
- SN_393 label "Discovery date".
- SN_393 label "Peak magnitude".
- SN_393 labelstyle "background: inherit;".
- SN_393 sign Shen_Yue.
- SN_393 source Book_of_Song.
- SN_393 text "A guest star appeared within the asterism Wěi during the second lunar month of the 18th year of the Tai-Yuan reign period, and disappeared during the ninth lunar month.".
- SN_393 wikiPageUsesTemplate Template:Convert.
- SN_393 wikiPageUsesTemplate Template:DEC.
- SN_393 wikiPageUsesTemplate Template:Infobox.
- SN_393 wikiPageUsesTemplate Template:Quote.
- SN_393 wikiPageUsesTemplate Template:RA.
- SN_393 wikiPageUsesTemplate Template:Reflist.
- SN_393 wikiPageUsesTemplate Template:Supernovae.
- SN_393 subject Category:393.
- SN_393 subject Category:4th-century_natural_events.
- SN_393 subject Category:Astronomical_objects_discovered_in_the_4th_century.
- SN_393 subject Category:Scorpius_(constellation).
- SN_393 subject Category:Supernova_remnants.
- SN_393 subject Category:Supernovae.
- SN_393 hypernym Designation.
- SN_393 type Event.
- SN_393 type Place.
- SN_393 type Event.
- SN_393 type Remnant.
- SN_393 comment "SN 393 is the modern supernova designation for an astronomical event that was reported by the Chinese in the year 393 CE.".