Themorphological class of NGC 7793 is SA(s)d,[6] indicating it isunbarred spiral galaxy (SA) with no inner ring structure (s) and thearms are loosely wound and disorganized (d). It is flocculent in appearance with a very small bulge and a star cluster at the nucleus.[5] Thegalactic disk is inclined at an angle of 53.7° to the line of sight from the Earth. The visible profile is elliptical in form with anangular size of9.3′ × 6.3′[5] and a major axis aligned along aposition angle of 99.3°.[6] There are two nearbydwarf galaxy companions.[9]
On March 25, 2008, atype II-P supernova designatedSN 2008bk was discovered in NGC 7793.[10][6] Atapparent magnitude 12.5, it became the 2nd brightest supernova of 2008.[11] The progenitor of this supernova was ared supergiant, observed only 547 days prior to the explosion.
NGC 7793 hosts the ultra-luminous X-ray pulsar (ULXP) referred to as NGC 7793 P13 (previously believed to harbor a black hole), which consists of a 0.42-second pulsar in a 64-day orbit with a 18-23 solar mass B9Ia companion star.[12]
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