HD 3

Star in the constellation Andromeda

HD 3
Observation data Epoch J2000 Equinox J2000
Constellation	Andromeda
Right ascension	00^h 05^m 09.75827^s^[1]
Declination	+45° 13′ 44.5108″^[1]
Apparent magnitude (V)	6.71^[2]
Characteristics
Evolutionary stage	Main sequence^[3]
Spectral type	A1 Vn^[3]
B−V color index	0.06^[2]
Astrometry

Radial velocity (R_v)	−18.0±4.4^[4] km/s
Proper motion (μ)	RA: −27.7680±060^[1] mas/yr Dec.: −20.062±0.054^[1] mas/yr
Parallax (π)	6.3137 ± 0.0826 mas^[1]
Distance	517 ± 7 ly (158 ± 2 pc)
Absolute magnitude (M_V)	+1.02^[5]

Details

Mass	2.36±0.08^[3] `M`_☉
Radius	1.9^[6] `R`_☉
Luminosity	43.5+7.9 −6.7^[3] `L`_☉
Temperature	9,057+169 −185^[3] K
Rotational velocity (v sin i)	228^[3] km/s

Other designations
BD+44°4550, FK5 4009, HD 3, HIP 424, HR 1, SAO 36042, WDS J00052+4514A^[7]
Database references
SIMBAD	data

HD 3 is a single,^[8] white-hued star in the northern constellation Andromeda. With an apparent visual magnitude of 6.71,^[2] it is below the nominal brightness limit for visibility with the typical naked eye but may still be visible by some observers under ideal viewing conditions. It is also the first star indexed in the Bright Star Catalogue.^[7] Based upon an annual parallax shift of 6.3137±0.0826 mas,^[1] it is located roughly 517 light years away. The star is moving closer with a heliocentric radial velocity of −18 km/s,^[4] and will make perihelion in around 2.9 million years at a separation of around 351 ly (107.71 pc).^[5]

The stellar classification of this star is A1 Vn,^[3] indicating it is an A-type main-sequence star with "nebulous" lines due to rapid rotation. It is a Lambda Boötis candidate star, being classified as chemically-peculiar by Abt & Morrell (1995).^[9] Murphy et al. (2015) list the membership likelihood as uncertain.^[2] HD 3 has 2.36^[3] times the mass of the Sun and about 1.9^[6] times the Sun's radius. It is spinning with a projected rotational velocity of 228 km/s.^[3] The star is radiating around 43.5^[3] times the Sun's luminosity from its photosphere at an effective temperature of about 9,057 K.^[3]

HD 3 has two visual companions. Component B is a magnitude 13.70 star at an angular separation of 16″ along a position angle (PA) of 107°, as of 2016. The third star, component C, is magnitude 10.58 and lies at a separation of 21″ along a PA of 235°, also as of 2016.^[10]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ ^a ^b ^c ^d Murphy, Simon J.; et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia, 32: 43, arXiv:1508.03633, Bibcode:2015PASA...32...36M, doi:10.1017/pasa.2015.34, S2CID 59405545, e036.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ ^a ^b 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.
^ ^a ^b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ ^a ^b "HD 3". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-30.
^ Abt, H. A. (March 1981), "Visual multiples. VII - MK classifications", Astrophysical Journal Supplement Series, 45: 437–456, Bibcode:1981ApJS...45..437A, doi:10.1086/190719.
^ Gerbaldi, M.; et al. (December 2003), "The heterogeneous class of lambda Bootis stars", Astronomy and Astrophysics, 412 (2): 447–464, Bibcode:2003A&A...412..447G, doi:10.1051/0004-6361:20031472.
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.

External links

HD 3 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images

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