101 Aquarii

Star in the constellation Aquarius b3 Aquarii other star systems with this Bayer designation b Aquarii Aquarius constellation map.svg center 260 right Red circle.svg 10 101 Aquarii 172 692 Location of 101 Aquarii (circled) J2000 23 33 16.62300 −20 54 52.2155 4.71 Aquarius main sequence A0 V +0.02 +0.00 +15 −3.41 +8.46 11.11 0.67 180 BD−21 6437, HD 221565, HIP 116247, HR 8939, SAO 191988 101+Aqr 101 Aquarii (abbreviated 101 Aqr) is a star in the equatorial constellation of Aquarius. 101 Aquarii is the Flamsteed designation, although it also bears the Bayer designation b3 Aquarii. 101 Aqr is a double star with the designation B 1900. The combined apparent visual magnitude of the pair is 4.71, which is bright enough to be seen with the naked eye from the suburbs. The distance of this star from Earth is estimated as 290 ly pc off on based upon parallax measurements. The brighter member of this system has an apparent magnitude of 4.81. It is an A-type main sequence star with a stellar classification of A0 V. This star is spinning rapidly with a projected rotational velocity of 1 km/s. The fainter companion is a magnitude 7.43 star at an angular separation of 0.840 arcseconds. References F. van Leeuwen November 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 2007A&A...474..653V 10.1051/0004-6361:20078357 . 0708.1752 18759600 Houk Nancy Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 4 Ann Arbor Dept. of Astronomy, University of Michigan 1978 1988mcts.book.....H . Wilson Ralph Elmer 1953 General Catalogue of Stellar Radial Velocities Carnegie Institute Washington D.C. Publication Carnegie Institution of Washington Washington 1953GCRV..C......0W . Royer F. Zorec J. Gómez A. E. Rotational velocities of A-type stars. III. Velocity distributions Astronomy and Astrophysics 463 2 671–682 10.1051/0004-6361:20065224 2007A&A...463..671R astro-ph/0610785 . February 2007 18475298 Nicolet B. 1978 Photoelectric photometric Catalogue of homogeneous measurements in the UBV System Astronomy and Astrophysics Supplement Series 34 1–49 1978A&AS...34....1N . Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 10.1111/j.1365-2966.2008.13596.x 2008MNRAS.389..869E 0806.2878 September 2008 free 14878976 Zorec J. Royer F. Rotational velocities of A-type stars. IV. Evolution of rotational velocities Astronomy and Astrophysics 2012 537 A120 10.1051/0004-6361/201117691 free 1201.2052 2012A&A...537A.120Z * 101 Aqr 2012-07-03 External links Image 101 Aquarii Aquarii, b3 Aquarii, 101 221565 Category:Aquarius (constellation) Category:Binary stars Category:A-type main-sequence stars 116247 Category:Bright Star Catalogue objects BD-21 6437