47 Andromedae

Binary star system in the constellation Andromeda

47 Andromedae
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Andromeda
Right ascension	01^h 23^m 40.6168^s^[1]
Declination	+37° 42′ 53.8084″^[1]
Apparent magnitude (V)	5.60 (6.33 + 6.38)^[2]
Characteristics
Spectral type	A1m^[3] (kA1hF1mF2)^[4]
B−V color index	0.276^[2]
Astrometry

Radial velocity (R_v)	+13.3±0.9^[5] km/s
Proper motion (μ)	RA: 81.773±0.225^[1] mas/yr Dec.: −19.592±0.226^[1] mas/yr
Parallax (π)	15.9805 ± 0.1578 mas^[1]
Distance	204 ± 2 ly (62.6 ± 0.6 pc)
Absolute magnitude (M_V)	2.30±0.06/2.35±0.06^[2]

Orbit^[2]
Period (P)	35.36815±0.00015 d
Eccentricity (e)	0.64781±0.00090
Inclination (i)	38°
Periastron epoch (T)	2,454,293.2187 ± 0.0056 HJD
Semi-amplitude (K₁) (primary)	39.216±0.079 km/s
Semi-amplitude (K₂) (secondary)	40.47±0.073 km/s
Details
47 And A
Mass	1.65^[2] `M`_☉
Radius	1.9±0.1^[2] `R`_☉
Luminosity	9.0±0.5^[2] `L`_☉
Rotational velocity (v sin i)	15±2^[2] km/s
Age	710^[6] Myr
47 And B
Radius	1.8±0.1^[2] `R`_☉
Luminosity	8.6±0.5^[2] `L`_☉
Rotational velocity (v sin i)	15±2^[2] km/s
Other designations
47 And, BD+36°237, FK5 2093, HD 8374, HIP 6514, HR 395, SAO 54655, PPM 66233^[7]
Database references
SIMBAD	data

47 Andromedae is a binary star^[2] system in the northern constellation of Andromeda. The designation is from the star catalogue of John Flamsteed, first published in 1712. The system has a combined apparent visual magnitude of 5.60,^[2] which is just bright enough to be faintly visible to the naked eye under good seeing conditions. The distance to this system, as determined from an annual parallax shift of 15.9805 mas,^[1] is about 204 light years. It is moving away from the Sun with a heliocentric radial velocity of +13.3 km/s.^[5]

The binary nature of this system was discovered by John Stanley Plaskett and Reynold Kenneth Young in 1919 using radial velocity measurements taken from Photographic plates obtained at Dominion Astrophysical Observatory in Saanich, British Columbia, Canada.^[8] It is a double-lined spectroscopic binary with an orbital period of 35.4 days and an eccentricity of 0.65. The components appear to be nearly identical Am stars, with a magnitude difference of 0.05.^[2] The combined stellar classification is A1m.^[3]

References

^ ^a ^b ^c ^d ^e ^f 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.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Fekel, Francis C.; et al. (September 2011), "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VII. 47 Andromedae, 38 Cassiopeiae, and HR 8467", The Astronomical Journal, 142 (3): 13, Bibcode:2011AJ....142...69F, doi:10.1088/0004-6256/142/3/69, hdl:2152/34401, 69
^ ^a ^b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
^ ^a ^b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
^ De Rosa, R. J.; et al. (2014), "The VAST Survey - III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932, S2CID 88503488.
^ "47 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-22.
^ Plaskett, J. S.; Young, R. K. (February 1919). "Notes from the Dominion Astrophysical Observatory, Victoria, B.C.. Second list of spectroscopic binaries". Journal of the Royal Astronomical Society of Canada. 13: 59–64. Bibcode:1919JRASC..13...59P.

Constellation of Andromeda

Stars

Bayer	α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ η θ ι κ λ μ ν ξ (Adhil) ο π ρ σ τ υ (Titawin) φ χ ψ ω A b c υ Per (Nembus)
Flamsteed	2 3 4 5 6 7 8 9 10 11 12 13 14 (Veritate) 15 18 22 23 26 28 32 36 39 41 44 45 47 55 56 58 59 63 64 65 66 6 Per
Variable	R T U W Z RT RV RX SU SW TU TW WZ XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GP GQ GX GR GY HH HN IW KK KX KZ LL LN LP LQ OP OS OU PX PY QO QR QV QX V385 V428 V439 V455 V529 V807
HR	1 40 56 78 104 122 134 178 275 282 283 289 379 410 483 687 746 748 8884 8925 8950 8962 8973 9011 9074 9075 9105
HD	16175 (Buna) 222155
Other	3XMM J004232.1+411314 ADS 48 HAT-P-6 (Sterrennacht) HAT-P-16 HAT-P-19 HAT-P-28 M31-RV KELT-1 NGC 44 NGC 82 NGC 84 NGC 91 NGC 162 NGC 464 Qatar-3 Qatar-4 PA-99-N2 WASP-1 WISE 0146+4234 WISE J0005+3737 WISE J004945.61+215120.0

Exoplanets	14 Andromedae b κ Andromedae b υ Andromedae b c d Gliese 15 Ab c HD 13931 b HD 16175 b HAT-P-6b HAT-P-32b WASP-1b WASP-33b Qatar-4b Qatar-5b

Star
clusters

NGC	206 272 752 956 7686
Other	Mayall II RBC EXT8

Nebulae

NGC	7662

Galaxies

Messier	32 110
NGC	5 11 13 19 20 21 27 39 43 48 49 51 67 68 69 70 71 72 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 280 304 317 389 393 404 425 431 477 512 513 523 528 529 531 536 542 561 605 620 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 753 759 801 812 834 891 906 910 911 912 913 920 937 980 995 996 999 1000 7640 7836
Numbered	I II III IV V VIII IX X XI XVIII XIX XXI
Other	3C 66A 3C 66B Andromeda Galaxy Arp 273 Donatiello I