1 Serpentis

Red giant star in the constellation Virgo Serpens Caput IAU.svg center 280 right Red circle.svg 10 1 Ser 758 838 Location of 1 Serpentis (circled) Virgo J2000.0 J2000.0 14 57 33.251 -00 10 03.40 5.5 Red clump K1III 20.12 +59.929 -26.500 10.1280 0.1010 +0.76 1.37 4,581 13.6 75 2.5 -0.07 3.4 4.58 1 Ser +00°3277 3881 132132 73193 5573 120758 1+Ser 1 Serpentis (1 Ser) is a red giant in the constellation Virgo with an apparent magnitude of 5.5. It is a red clump giant, a cool horizontal branch star that is fusing helium in its core. It has expanded to over 13 times the radius of the Sun and although it is cooler at 4,581 commas K it is 77 times more luminous. It is 322 light years away. The Flamsteed designation 1 Serpentis was given to the star when the constellation Serpens was combined with the constellation Ophiuchus. It was also given the Bayer designation M Serpentis. When Ophiuchus and Serpens were separated into distinct constellations, 1 Serpentis was left over the border in Libra. Since then it has moved slightly and is now in Virgo. A 10th-magnitude companion star discovered by William Herschel is 86 " away. It is at the same distance as 1 Ser and shares a common proper motion, It is considered likely to be a physical companion, with the two stars separated by 8,600 commas au. It has a spectral type of G5 IV, and it is slightly smaller and less luminous than the sun. A much more widely-separated 10th-magnitude star is also listed in multiple star catalogues, but it is an unrelated background object. References 3650900223700313088 3650900086261359232 3650886479804959360 1999MSS...C05....0H Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars, Vol. 5 Michigan Spectral Survey 5 Houk N. Swift C. 1999 2008AJ....135..209M Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity The Astronomical Journal 135 1 209 Massarotti Alessandro Latham David W. Stefanik Robert P. Fogel Jeffrey 2008 10.1088/0004-6256/135/1/209 121883397 free 2001AJ....122.3466M The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Mason Brian D. Wycoff Gary L. Hartkopf William I. Douglass Geoffrey G. Worley Charles E. 2001 10.1086/323920 free 2008MNRAS.389..869E A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 Eggleton P. P. Tokovinin A. A. 2008 10.1111/j.1365-2966.2008.13596.x 0806.2878 free 1960AJ.....65...60S A study of visual binaries having primaries above the main sequence The Astronomical Journal 65 60 Stephenson C. B. 1960 10.1086/108191 73193 2008A&A...480...91S Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants Astronomy and Astrophysics 480 1 91 Soubiran C. Bienaymé O. Mishenina T. V. Kovtyukh V. V. 2008 0712.1370 10.1051/0004-6361:20078788 free 16602121 2007AJ....133.2464L Giants in the Local Region The Astronomical Journal 133 6 2464 Luck R. Earle Heiter Ulrike 2007 10.1086/513194 free 1991bsc..book.....H 1991 The Bright star catalogue Hoffleit Dorrit Jaschek Carlos Serpens, the serpent http://www.ianridpath.com/startales/serpens.htm Ian Rdipath Ian Ridpath 2019-08-28 Category:Virgo (constellation) Category:K1III stars Serpentis, 01 5573 132132 073193 Category:Durchmusterung objects 3881 Serpentis, M Category:Binary stars Category:G-type subgiants Category:Horizontal-branch stars