HD 179821

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.

HD 179821
HD 179821.jpg
HD 179821
Credit: Hubble Legacy Archive
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 13m 58.61s
Declination +00° 07′ 31.9″
Apparent magnitude (V) 8.19
Characteristics
Evolutionary stage YHG or post-AGB
Spectral type G4 0-Ia
Variable type SRd
Astrometry
Distance17,000 ly
Absolute magnitude (MV)−8.9
Details
Mass17 - 22 M
Radius400 - 450 R
Luminosity126,000 - 295,000 L
Temperature4,898-6,761 K
Other designations
HD 179821, V1427 Aql, AFGL 2343, BD−00°3679, HIP 94496, SAO 124414, IRAS 19114+0002, 2MASS J19135861+0007319