Star in the constellation Boötes
ρ Boötis Location of ρ Boötes (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Boötes Right ascension 14h 31m 49.789s [ 1] Declination +30° 22′ 17.17″[ 1] Apparent magnitude (V)3.59[ 2] Characteristics Spectral type K4 III[ 3] U−Bcolor index +1.44[ 2] B−Vcolor index +1.30[ 2] R−Icolor index 0.65[citation needed Variable type RS CVn .[ 4] Astrometry Radial velocity (Rv )± 0.19[ 5] km/s Proper motion (μ)RA: –100.531mas /yr [ 1] Dec.: +119.870mas /yr [ 1] Parallax (π)19.8550± 0.1587 mas [ 1] Distance 164 ± 1 ly pc ) Absolute magnitude (MV )+0.27[ 3] Details[ 6] Mass ± 0.12M ☉ Radius ± 0.19R ☉ Luminosity ± 6.8L ☉ Surface gravity (log g )± 0.05[ 7] cgs Temperature ± 54K Metallicity [Fe/H] ± 0.10[ 7] dex Rotational velocity (v sin i )5.0[ 8] Age ± 1.17Gyr Other designations ρ Boo ,25 Boötis ,BD +31°2628FK5 534GC 19597HD 127665HIP 71053HR 5429SAO 64202PPM 77975WDS J14318+3022A[ 9] Database references SIMBAD data
ρ Boötis in optical light Alight curve for Rho Boötis, plotted fromHipparcos [ 10] Rho Boötis is a single,[ 11] star in thenorthern constellation ofBoötes . Its name is aBayer designation that isLatinised from ρ Boötis, and abbreviated Rho Boo or ρ Boo. This star is visible to thenaked eye with anapparent visual magnitude of 3.59.[ 2] parallax measurements, it is located at a distance of approximately 164light-years (50parsecs ) fromEarth . It is moving closer to the Sun with aradial velocity of −13.6 km/s.[ 5] arcseconds away along aposition angle of 345° (as of 2013).[ 12]
This is anevolved K-type giant star , currently on thered-giant branch , with astellar classification of K4 III[ 3] [ 6] spectrum of this star has served as one of the stable anchor points by which other stars are classified.[ 13] mass of the Sun , it has expanded to 20.6 times the Sun's girth. The star is radiating 129 times theSun's luminosity from its enlargedphotosphere at aneffective temperature of aboutK [ 6] RS Canum Venaticorum variable .[ 4] [dubious discuss Koen and Eyer examined the Hipparcos data for this star, and found that it varied with a period of 5.214 days, and an amplitude of 0.0027 magnitudes.[ 14]
Rho Boötis is known by several different names, includingρ Boo ,25 Boötis ,BD +31° 2628,FK5 534,HD 127665,HIP 71053,HR 5429, andSAO 64202.[ 9] Chinese ,梗河 Gěng Hé Celestial Lance asterism consisting of ρ Boötis,ε Boötis andσ Boötis .[ 15] Chinese name for ρ Boötis itself is梗河三 Gěng Hé sān the Third Star of Celestial Lance ).[ 16]
^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 Jennens, P. A.; Helfer, H. L. (September 1975), "A new photometric metal abundance and luminosity calibration for field G and K giants",Monthly Notices of the Royal Astronomical Society 172 (3):667– 679,Bibcode :1975MNRAS.172..667J ,doi :10.1093/mnras/172.3.667 ^a b c Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars",Astronomy and Astrophysics ,430 :303– 311,arXiv :astro-ph/0409683 Bibcode :2005A&A...430..303C ,doi :10.1051/0004-6361:20041440 ,S2CID 12136256 . ^a b "NSV 6697" ,The International Variable Star Index , AAVSO, retrieved15 October 2022 .^a b 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 c Baines, Ellyn K.; et al. (2018), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer",The Astronomical Journal ,155 (1), 30,arXiv :1712.08109 Bibcode :2018AJ....155...30B ,doi :10.3847/1538-3881/aa9d8b S2CID 119427037 ^a b Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity",Astronomy & Astrophysics ,574 : A116,arXiv :1412.4634 Bibcode :2015A&A...574A.116R ,doi :10.1051/0004-6361/201322360 ,hdl :10722/215277 ,S2CID 59334290 . ^ 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 ^a b "rho Boo" ,SIMBAD Centre de données astronomiques de Strasbourg , retrieved2021-08-09 .^ "HIP CDROM catalogues" ,Centre de Données astronomiques de Strasbourg , Strasbourg astronomical Data Center, retrieved15 October 2022 .^ 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 . ^ Mason, Brian D.; et al. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog",The Astronomical Journal ,122 (6):3466– 3471,Bibcode :2001AJ....122.3466M ,doi :10.1086/323920 ^ Garrison, R. F. (December 1993),"Anchor Points for the MK System of Spectral Classification" ,Bulletin of the American Astronomical Society ,25 : 1319,Bibcode :1993AAS...183.1710G , archived fromthe original on June 25, 2019, retrievedFebruary 4, 2012 . ^ Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry",Monthly Notices of the Royal Astronomical Society ,331 (1):45– 59,arXiv :astro-ph/0112194 Bibcode :2002MNRAS.331...45K ,doi :10.1046/j.1365-8711.2002.05150.x ^ 陳久金 (2005),中國星座神話 [Chinese Horoscope Myths ] (in Chinese), 台灣書房出版有限公司,ISBN 978-986-7332-25-7 ^ AEEA 天文教育資訊網 2006年6月29日 AEEA Astronomy Education Information Network June 29, 2006 ] (in Chinese), AEEA Astronomy Education Information Network, June 29, 2006,archived from the original on June 5, 2021, retrievedAugust 9, 2021 .
