G-type giant in the constellation Dorado
π2 Doradus
Location of π
2 Doradus on the map (circled)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation
Dorado
Right ascension 06h 25m 28.63069s [ 1]
Declination
−69° 42′ 25.0800″[ 1]
Apparent magnitude (V)5.38[ 2]
Characteristics
Evolutionary stage
horizontal branch [ 3]
Spectral type
G8 III[ 4]
U−B color index
+0.67[ 2]
B−V color index
+0.97[ 2]
Astrometry Radial velocity (Rv )9.1± 2.8[ 5] Proper motion (μ) RA: −12.184 mas /yr [ 1] Dec.: +200.786 mas /yr [ 1] Parallax (π)11.7563 ± 0.058 mas [ 1] Distance 277 ± 1 ly pc ) Absolute magnitude (MV )+0.78[ 6] Details[ 7] Mass 1.80± 0.07 M ☉ Radius 9.84± 0.16 R ☉ Luminosity 51.1± 1.1 L ☉ Surface gravity (log g )2.66± 0.08 cgs Temperature 4,919± 29 K Metallicity −0.26± 0.03 dex Rotational velocity (v sin i )<2.0[ 8] Age 1.61± 0.15[ 9] Gyr Other designations π2 Dor ,
42 G. Doradus [ 10] ,
CD −69°392,
CPD −69°614,
FK5 2495,
GC 8390,
HD 46116,
HIP 30565,
HR 2327,
SAO 249550,
TIC 167126852[ 11] Database references SIMBAD data
Pi2 Doradus , Latinized from π2 Doradus , is a solitary star [ 12] constellation Doradus . It is faintly visible to the naked eye as a yellow-hued point of light with an apparent magnitude of 5.38.[ 2] light-years based on Gaia DR3 parallax measurements, but it is receding with a heliocentric radial velocity of approximately km/s [ 5] 2 Doradus' brightness is diminished by 0.27 magnitudes due to interstellar extinction [ 13] absolute magnitude of +0.78.[ 6]
Pi2 Doradus has a stellar classification of G8 III,[ 4] evolved G-type giant star . It is a red clump star that is currently on the horizontal branch —fusing helium at its stellar core .[ 3] mass of the Sun [ 7] billion years ,[ 9] radius of the Sun .[ 7] luminosity of the Sun from its photosphere at an effective temperature of K [ 7] 2 Doradus is metal deficient with an iron abundance of [Fe/H] = −0.26 or roughly 55% of the Sun 's.[ 7] 2 Doradus spins slowly, having a projected rotational velocity lower than km/s [ 8]
References
^ 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 at VizieR .^ a b c d Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory . 4 : 99– 110. Bibcode :1966CoLPL...4...99J . ^ a b Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars" . Monthly Notices of the Royal Astronomical Society . 419 (2): 1637– 1641. arXiv :1109.4800 Bibcode :2012MNRAS.419.1637L . doi :10.1111/j.1365-2966.2011.19826.x ISSN 0035-8711 . S2CID 117788450 . ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53° . Vol. 1. Bibcode :1975mcts.book.....H . ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters . 32 (11): 759– 771. arXiv :1606.08053 Bibcode :2006AstL...32..759G . doi :10.1134/S1063773706110065 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119231169 . ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331– 346. arXiv :1108.4971 Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . eISSN 1562-6873 . ISSN 1063-7737 . S2CID 119257644 . ^ a b c d e Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars" . Astronomy & Astrophysics . 657 : A87. arXiv :2201.01528 Bibcode :2022A&A...657A..87O . doi :10.1051/0004-6361/202040078 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 245440163 . ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *" . Astronomy & Astrophysics . 561 : A126. arXiv :1312.3474 Bibcode :2014A&A...561A.126D . doi :10.1051/0004-6361/201220762 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 54046583 . ^ a b Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity" . Astronomy & Astrophysics . 646 : A77. arXiv :2012.10199 Bibcode :2021A&A...646A..77G . doi :10.1051/0004-6361/202039765 eISSN 1432-0746 . ISSN 0004-6361 . S2CID 229331727 . ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino . 1 . Bibcode :1879RNAO....1.....G . ^ "* pi.02 Dor" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved September 28, 2023 .^ Eggleton, P. P.; Tokovinin, A. A. (11 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 eISSN 1365-2966 . ISSN 0035-8711 . S2CID 14878976 . ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars" . Monthly Notices of the Royal Astronomical Society . 472 (4): 3805– 3820. arXiv :1709.01160 Bibcode :2017MNRAS.472.3805G . doi :10.1093/mnras/stx2219 eISSN 1365-2966 . ISSN 0035-8711 . S2CID 118879856 .
