Themorphological class of NGC 45 is SA(s)dm,[6] indicating this is a spiral galaxy with no prominent innerbar (SA) or ring (s) feature. There is nocentral bulge to speak of.[7] Thegalactic plane is inclined at an angle of55°±5° to the line of sight from the Earth, with the major axis of the elliptical profile being aligned along aposition angle of145°±5°.[7]Star formation is proceeding at a modest rate of~0.20 M☉·yr−1.[6]
Unlike the Milky Way, NGC 45 has no clearly definedspiral arms, and itscenter bar nucleus is also very small and distorted. NGC 45 thus does not have agalactic habitable zone.[11][12][13] For the Milky Way, the galactic habitable zone is commonly believed to be anannulus with an outer radius of about 10kiloparsecs and an inner radius close to theGalactic Center, both of which lack hard boundaries.[12]
AT2018bwo (typeLRN, mag. 16.4352) was discovered by theDistance Less Than 40 Mpc Survey (DLT40) on 22 May 2018.[14] Luminous red novae are thought to be the result of stars merging. The progenitor of AT2018bwo was ayellow supergiant star.[15]
AT2018htr (typeLBV, mag. 17.4692) was discovered by DLT40 on 3 November 2018.[16]
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Media related toNGC 45 at Wikimedia Commons
