What is HD 179821?
{{Starbox begin | name = HD&nbsp;179821}}{{Starbox image | image = [[File:HD 179821.jpg|250px]] | caption = HD 179821 | credit = Hubble Legacy Archive }} {{Starbox observe | epoch =J2000 | equinox =J2000 | constell = [[Aquila (constellation)|Aquila]] | ra = {{RA|19|13|58.61}} | dec = {{DEC|+00|07|31.9}} | appmag_v=8.19 }} {{Starbox character | type = [[yellow hypergiant|YHG]] or [[post-AGB star|post-AGB]] | class = G4 0-Ia | variable = [[Semi-regular variable|SRd]] }} {{Starbox astrometry | dist_ly=17,000 | absmag_v=−8.9 }} {{Starbox detail | mass=17 - 22 | radius=400 - 450 | luminosity=126,000 - 295,000 | temperature=4,898-6,761 }} {{Starbox catalog | names=[[Henry Draper catalogue|HD]]&nbsp;179821, [[Variable star designation|V1427]]&nbsp;Aql, [[RAFGL|AFGL]]&nbsp;2343, [[Bonner Durchmusterung|BD]]&minus;00°3679, [[Hipparcos catalogue|HIP]]&nbsp;94496, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;124414, [[IRAS]]&nbsp;19114+0002, [[2MASS]]&nbsp;J19135861+0007319 }} {{Starbox end}} '''HD 179821''' or V1427 Aquilae is a post-red supergiant yellow hypergiant star in the constellation of Aquila. It is surrounded by a detached dust shell. It is a semi-regular variable nearing the end of its life. [[Category:Stars]]