V1401 Aquilae

V1401 Aquilae

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	20^h 05^m 05.41390^s
Declination	−11° 35′ 57.8808″
Apparent magnitude (V)	6.39
Characteristics
Spectral type	F1III
B−V color index	0.52
Variable type	SRd[1]
Astrometry
Radial velocity (Rv)	-12.1 ± 2 km/s
Proper motion (μ)	RA: -2.19 ± 0.44 mas/yr Dec.: -14.18 ± 0.43 mas/yr
Parallax (π)	2.56 ± 0.97 mas
Distance	approx. 1,300 ly (approx. 400 pc)
Absolute magnitude (MV)	6.88
Details
Other designations
BD-12° 5641, HD 190390, NSV 12766, HIP 98910, HR 7671, SAO 163245.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

V1401 Aquilae is semi-regular pulsating star in the constellation Aquila. Its evolutionary status is unclear, and it has been classified as a post-AGB object, a UU Herculis variable or belonging to the W Virginis variable subclass of the type II Cepheids. It has a low metallicity.^[2] V1401 Aquilae was a latter designation of 64 Sagittarii.^[3]

References

1. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S 1. Bibcode:2009yCat....102025S.
2. Reyniers, M.; Cuypers, J. (2005). "The evolutionary status of the bright high-latitude supergiant HD 190390". Astronomy and Astrophysics 432 (2): 595–608. arXiv:astro-ph/0411493. Bibcode:2005A&A...432..595R. doi:10.1051/0004-6361:20042097.
3. Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 209, 221. Bibcode:1987JHA....18..209W.