Star in the constellation of Bootes
Psi Boötis Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS ) Constellation Boötes Right ascension 15h 04m 26.743s [ 1] Declination +26° 56′ 51.53″[ 1] Apparent magnitude (V)+4.55[ 2] Characteristics Evolutionary stage red clump [ 3] Spectral type K2 III[ 4] U−Bcolor index +1.34[ 2] B−Vcolor index +1.23[ 2] Astrometry Radial velocity (Rv )± 0.18[ 5] km/s Proper motion (μ)RA: −174.718mas /yr [ 1] Dec.: −5.036mas /yr [ 1] Parallax (π)12.6144± 0.0896 mas [ 1] Distance 259 ± 2 ly pc ) Absolute magnitude (MV )+0.16[ 6] Details Mass 1.38[ 7] M ☉ Radius 20[ 5] R ☉ Luminosity 135[ 7] L ☉ Surface gravity (log g )2.2[ 5] cgs Temperature ± 22[ 7] K Metallicity [Fe/H] −0.35[ 5] dex Rotational velocity (v sin i )3.5[ 5] Age 4.16[ 7] Gyr Other designations Aulad al Nathlat[ 8] ψ Boo ,43 Boötis ,BD +27°2447FK5 557GC 20285HD 133582HIP 73745HR 5616SAO 83645[ 9] Database references SIMBAD data
Psi Boötis is a single,[ 10] star in the northernconstellation ofBoötes . Its name is aBayer designation that isLatinized from ψ Boötis, and abbreviated Psi Boo or ψ Boo. This is a dim star that is visible to thenaked eye with anapparent visual magnitude of +4.55.[ 2] parallax shift ofmas light-years (79 pc ) from theSun . At that distance, the visual magnitude is diminished by anextinction of 0.09 due tointerstellar dust .[ 6] proper motion of 0.176 arc seconds per year,[ 11] radial velocity toward the Sun of −25.72 km/s.[ 5]
This star has astellar classification of K2 III,[ 4] evolved K-type giant star . It belongs to the so-calledred clump ,[ 3] helium fusion at its core. This star is about four[ 7] projected rotational velocity of 3.5 km/s.[ 5] [ 7] mass of the Sun and has expanded to 20[ 5] Sun's radius . Psi Boötis radiating 135[ 7] Sun's luminosity from its enlargedphotosphere at aneffective temperature of 4,302 K.[ 7]
This star, according to Assemani, with another in the right arm that may have beenε Boo (Izar), constituted the Arabs'Al Aulād al Nadhlāt , which he renderedfilii altercationis (sons of contention); but the original signifies "the Low, or Mean, Little Ones".[ 12]
Al Aulād al Nadhlāt orAulad al Nathlat was the title of this star in the catalogue of stars inTechnical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars .[ 8]
^a b c d Vallenari, A.; et al. (Gaia collaboration) (2023),"Gaia Data Release 3. Summary of the content and survey properties" ,Astronomy and Astrophysics ,674 : A1,arXiv :2208.00211 Bibcode :2023A&A...674A...1G ,doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source atVizieR .^a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars",Communications of the Lunar and Planetary Laboratory ,4 (99): 99,Bibcode :1966CoLPL...4...99J . ^a b Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity",The Astrophysical Journal ,539 (2):732– 741,arXiv :astro-ph/0003329 Bibcode :2000ApJ...539..732A ,doi :10.1086/309278 ,S2CID 16673121 . ^a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars",Astrophysical Journal Supplement Series ,71 : 245,Bibcode :1989ApJS...71..245K ,doi :10.1086/191373 . ^a b c d e f g h Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity",The Astronomical Journal ,135 (1):209– 231,Bibcode :2008AJ....135..209M ,doi :10.1088/0004-6256/135/1/209 S2CID 121883397 . ^a b Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters",Astronomy and Astrophysics ,430 :165– 186,arXiv :astro-ph/0409579 Bibcode :2005A&A...430..165F ,doi :10.1051/0004-6361:20041272 ,S2CID 17804304 . ^a b c d e f g h Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants",The Astronomical Journal ,150 (3): 88,arXiv :1507.01466 Bibcode :2015AJ....150...88L ,doi :10.1088/0004-6256/150/3/88 ,S2CID 118505114 . ^a b Rhoads, Jack W. (November 15, 1971),Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars , retrieved2025-06-06 . ^ "psi Boo" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2017-09-09 .^ 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 . ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)",The Astronomical Journal ,129 (3):1483– 1522,arXiv :astro-ph/0412070 Bibcode :2005AJ....129.1483L ,doi :10.1086/427854 ,S2CID 2603568 . ^ Allen, R. H. (1963).Star Names: Their Lore and Meaning ISBN 0-486-21079-0 . Retrieved2010-12-12 .{{cite book }}: CS1 maint: ignored ISBN errors (link )Hoffleit; et al. (1991),"HR 5616" ,Bright Star Catalogue (5th Revised ed.), retrieved2017-09-11 . "psi Boo" ,Aladin previewer , Centre de Données astronomiques de Strasbourg, retrieved2017-09-11 .
