42 Aquilae - Misplaced Pages

(Redirected from 42 Aql) Star in the constellation Aquila

42 Aquilae
Observation data Epoch J2000 Equinox J2000
Constellation	Aquila
Right ascension	19 37 47.31770
Declination	−04° 38′ 51.5072″
Apparent magnitude (V)	5.45
Characteristics
Spectral type	F3 IV/V
B−V color index	0.429±0.003
Astrometry

Radial velocity (R_v)	−37.6±1.8 km/s
Proper motion (μ)	RA: +105.381 mas/yr Dec.: –53.557 mas/yr
Parallax (π)	31.1671 ± 0.1422 mas
Distance	104.6 ± 0.5 ly (32.1 ± 0.1 pc)
Absolute magnitude (M_V)	2.98

Details

Mass	1.26 `M`_☉
Luminosity	5.76 `L`_☉
Surface gravity (log g)	4.00 cgs
Temperature	6,749±80 K
Metallicity	0.17 dex
Rotational velocity (v sin i)	87.0±4.4 km/s
Age	1.283 Gyr

Other designations
42 Aql, BD−04° 4861, HD 185124, HIP 96556, HR 7460, SAO 143621
Database references
SIMBAD	data

42 Aquilae, abbreviated 42 Aql, is a single star in the equatorial constellation of Aquila. 42 Aquilae is its Flamsteed designation. It is a dim star but visible to the naked eye under suitable viewing conditions, having an apparent visual magnitude of 5.45. 42 Aql is located some 104.6 light years away, as determined from its annual parallax shift of 31.2 mas. it is moving closer to the Earth with a heliocentric radial velocity of −38 km/s, and is predicted to come to within 52 light-years of the Sun in around 752,000 years.

The stellar classification of this star is F3 IV/V, which matches an F-type star with blended spectral traits of a main sequence star and a subgiant star. It is around 1.3 billion years old with a relatively high rate of rotation, having a projected rotational velocity of 87 km/s. The star has 1.26 times the mass of the Sun and is radiating 5.76 times the Sun's luminosity from its photosphere at an effective temperature of 6,749 K. These coordinates are a source of X-ray emission, which is most likely (99.3% chance) coming from the star.

References

^ 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.
^ 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, S2CID 119257644.
^ Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Bibcode:1999MSS...C05....0H.
^ Casagrande, L.; et al. (June 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
^ Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
"42 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 31, 2018.
Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.

Constellation of Aquila

Stars

Bayer	α (Altair) β (Alshain) γ (Tarazed) δ ε ζ (Okab) η θ (Tseen Foo) ι κ λ μ ν ξ (Libertas) ο π σ τ υ φ χ ψ ω ω A b c d e f g h i k l
Flamsteed	4 5 7 8 10 11 18 19 20 21 22 23 24 42 45 46 51 56 57 58 62 64 66 68 69 70 14 Sge 62 Ser 64 Sgr
Variable	R U V W TT FF QS V368 V450 V500 V603 V604 V605 V606 V923 V1286 V1291 V1298 V1302 V1315 V1333 V1339 V1427 V1428 V1429 V1472 V1487 V1494 V1654 V1672 V1691 V1703 (Phoenicia) V1828 V1936
HR	7099 7143 7288 7300 7307 7396 7456 7569 7598 7599 7693 7717 7803
HD	179079 183263 187734 192699 (Chechia)
Other	CoRoT-2 CoRoT-3 CoRoT-8 Gaia BH3 HAT-P-41 PSR J1856+0245 PSR J1903+0327 PSR B1913+16 (Hulse–Taylor) PSR J1951+1123 SGR 1900+14 SS 433 W43A W49-2 WASP-80 (Petra) WD J1953−1019 ZTF J1901+1458

Exoplanets	CoRoT-2b CoRoT-3b CoRoT-8b CoRoT-10b HD 179079 b HD 183263 b c HD 192263 b HD 192699 b ξ Aquilae b

Star clusters	NGC 6709 NGC 6738 NGC 6755 NGC 6756 NGC 6760

Nebulae

NGC	6741 6751 6778 6781 6790
Other	Abell 48 Abell 70 E Nebula Hen 2-428 HESS J1857+026 Kesteven 75 Smith's Cloud W43 W49 W49B W50

Galaxies

NGC	6814
Other	IC 1327