Star in the constellation Aquarius
τ1 Aquarii Location of τ
1 Aquarii (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Aquarius Right ascension 22h 47m 42.76996s [ 1] Declination –14° 03′ 23.1419″[ 1] Apparent magnitude (V)+5.66[ 2] Characteristics Spectral type B9 V[ 3] U−Bcolor index –0.25[ 4] B−Vcolor index –0.05[ 4] Astrometry Radial velocity (Rv )+15[ 5] km/s Proper motion (μ)RA: +29.960 [ 1] mas /yr Dec.: –9.009 [ 1] mas /yr Parallax (π)9.1849± 0.1301 mas [ 1] Distance 355 ± 5 ly pc ) Absolute magnitude (MV )+0.74[ 6] Details Mass ± 0.05[ 7] M ☉ Radius 2.0[ 8] R ☉ Luminosity 63.5[ 7] L ☉ Temperature 10,617[ 7] K Rotational velocity (v sin i )185[ 7] Age 100[ 9] Myr Other designations τ1 Aqr 69 Aquarii BD –14 6346GC 31802HD 215766HIP 112542HR 8673SAO 165298ADS 16268WDS J22477-1403A[ 10] Database references SIMBAD data
Tau1 Aquarii ,Latinized from τ1 Aquarii, is theBayer designation for a single[ 11] star in theequatorial constellation ofAquarius . With anapparent visual magnitude of 5.66,[ 2] requires dark suburban skies for viewing.Parallax measurements made during theHipparcos mission yield a distance estimate of roughly 355light-years (109parsecs ) from Earth.[ 1] radial velocity of +15 km/s.[ 5] Pisces-Eridanus stellar stream .[ 12]
Thestellar classification of τ1 Aquarii is B9 V;[ 3] B- andA-type main sequence star . This is a candidatesilicon star ; a type ofAp star of classCP2 that shows amagnetic field .[ 13] [ 9] projected rotational velocity of 185 km/s.[ 7] [ 7] [ 8] [ 7] photosphere at aneffective temperature of 10,617 K.[ 7] debris disk . The model that best fits the data suggests there are two concentriccircumstellar disks .[ 9]
^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 atVizieR .^a b Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars",Monthly Notes of the Astronomical Society of Southern Africa ,27 : 11,Bibcode :1968MNSSA..27...11C . ^a b Houk, Nancy (1978),Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode :1988mcts.book.....H . ^a b Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System",Astronomy and Astrophysics Supplement Series ,34 :1– 49,Bibcode :1978A&AS...34....1N . ^a b Wilson, Ralph Elmer (1953), "General catalogue of stellar radial velocities",Carnegie Institute Washington D.C. Publication , Carnegie Institution of Washington,Bibcode :1953GCRV..C......0W . ^ 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 c d e f g h Zorec, J.; Royer, F. (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 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics",Astronomy and Astrophysics ,367 (2):521– 524,arXiv :astro-ph/0012289 Bibcode :2001A&A...367..521P ,doi :10.1051/0004-6361:20000451 ,S2CID 425754 . ^a b c Morales, Farisa Y.; et al. (April 2011),"Common Warm Dust Temperatures Around Main-sequence Stars" (PDF) ,The Astrophysical Journal Letters ,730 (2): L29,Bibcode :2011ApJ...730L..29M ,doi :10.1088/2041-8205/730/2/L29 ,S2CID 2360696 . ^ "* tau01 Aqr" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2012-07-03 .^ 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 . ^ Curtis, Jason L.; et al. (August 2019), "TESS Reveals that the Nearby Pisces-Eridanus Stellar Stream is only 120 Myr Old",The Astronomical Journal ,158 (2): 11,arXiv :1905.10588 Bibcode :2019AJ....158...77C ,doi :10.3847/1538-3881/ab2899 S2CID 166228270 , 77. ^ Wraight, K. T.; et al. (2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars★",Monthly Notices of the Royal Astronomical Society ,420 (1):757– 772,arXiv :1110.6283 Bibcode :2012MNRAS.420..757W ,doi :10.1111/j.1365-2966.2011.20090.x S2CID 14811051 .
