58 Aquilae

58 Aquilae is a single[7] star located around 520 light years from the Sun in the equatorial constellation of Aquila, near Eta Aquilae. 58 Aquilae is its Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.60.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −53 km/s,[4] and may come as close as 161 light-years in around 1.8 million years.[2]

58 Aquilae

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila
Right ascension	19^h 54^m 44.79543^s[1]
Declination	+00° 16′ 25.0534″[1]
Apparent magnitude (V)	5.60[2]
Characteristics
Spectral type	B9 IV[3]
B−V color index	0.098±0.026[2]
Astrometry
Radial velocity (Rv)	−53.1[4] km/s
Proper motion (μ)	RA: +39.126[1] mas/yr Dec.: –13.931[1] mas/yr
Parallax (π)	6.2649 ± 0.1382[1] mas
Distance	520 ± 10 ly (160 ± 4 pc)
Absolute magnitude (MV)	0.32[2]
Details
Radius	5.62+0.08 −0.19[1] R☉
Luminosity	116.5±3.0[1] L☉
Surface gravity (log g)	3.8[4] cgs
Temperature	7,946[5] K
Metallicity [Fe/H]	−0.23±0.04[2] dex
Rotational velocity (v sin i)	110[4] km/s
Other designations
58 Aql, BD−00° 3871, GC 27565, HD 188350, HIP 97980, HR 7596, SAO 125219[6]
Database references
SIMBAD	data

This object has a stellar classification of B9 IV,[3] matching a late B-type subgiant star. It has 5.6[1] times the radius of the Sun with a high rate of spin, showing a projected rotational velocity of 110 km/s.[4] The star is radiating 117[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,946 K.[5]

References

1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
3. Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
4. Gebran, M.; et al. (2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics, 589: A83, arXiv:1603.01146, Bibcode:2016A&A...589A..83G, doi:10.1051/0004-6361/201528052.
5. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016), "The PASTEL catalogue: 2016 version", Astronomy & Astrophysics, 591: A118, arXiv:1605.07384, Bibcode:2016A&A...591A.118S, doi:10.1051/0004-6361/201628497.
6. "58 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 1, 2018.
7. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.