HD 201298
Star in the constellation Equuleus
HD 201298 (HR 8090 ) is a solitary star located in the northern constellation Equuleus just next to 3 Equulei It has an apparent magnitude of 6.14,[ 2] making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years [ 1] but is drifting away with a heliocentric radial velocity of 20 km/s .[ 6]
HD 201298 has a stellar classification of M0 III, indicating that it is ageing M-type star [ 4] that is probably on the red giant branch .[ 3] As a result, it has expanded to 117 times the Sun 's girth.[ 7] At present it has 1.83 times the mass of the Sun [ 7] and shines with a luminosity of 1,648 L ☉ from its enlarged photosphere at an effective temperature of 3,732 K ,[ 8] which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5± 1 km/s ,[ 10] slightly faster than most giants.
Note
^ Calculated using this equation:
M
V
=
6.14
− − -->
5
(
log
10
-->
349
− − -->
1
)
=
− − -->
1.57
{\displaystyle M_{\mathrm {V} }=6.14-5\left(\log _{10}349-1\right)=-1.57}
References
^ a b c d e Brown, A. G. A. ; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties" . Astronomy & Astrophysics . 649 : A1. arXiv :2012.01533 . Bibcode :2021A&A...649A...1G . doi :10.1051/0004-6361/202039657 . S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source at VizieR .
^ 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 . ISSN 1063-7737 . S2CID 255204555 .
^ a b Gontcharov, G. A. (October 2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters . 37 (10): 707–717. arXiv :1607.00557 . Bibcode :2011AstL...37..707G . doi :10.1134/S1063773711090040 . ISSN 1063-7737 . S2CID 119272127 .
^ a b Henry, Gregory W.; Fekel, Francis C.; Henry, Stephen M.; Hall, Douglas S. (September 2000). "Photometric Variability in a Sample of 187 G and K Giants" . The Astrophysical Journal Supplement Series . 130 (1): 201–225. Bibcode :2000ApJS..130..201H . doi :10.1086/317346 . ISSN 0067-0049 .
^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory . 4 : 99–110. Bibcode :1966CoLPL...4...99J .
^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication : 0. Bibcode :1953GCRV..C......0W .
^ a b c d Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3" . Astronomy & Astrophysics . 657 : A7. arXiv :2109.10912 . Bibcode :2022A&A...657A...7K . doi :10.1051/0004-6361/202142146 . eISSN 1432-0746 . ISSN 0004-6361 .
^ a b c McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos" . Monthly Notices of the Royal Astronomical Society . 427 (1): 343–357. arXiv :1208.2037 . Bibcode :2012MNRAS.427..343M . doi :10.1111/j.1365-2966.2012.21873.x . ISSN 0035-8711 .
^ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars" . Monthly Notices of the Royal Astronomical Society . 471 (1): 770. arXiv :1706.02208 . Bibcode :2017MNRAS.471..770M . doi :10.1093/mnras/stx1433 .
^ a b de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars" . Astronomy and Astrophysics Supplement Series . 139 (3): 433–460. Bibcode :1999A&AS..139..433D . doi :10.1051/aas:1999401 . ISSN 0365-0138 .
^ "HD 201298" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 20, 2022 .
^ 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 .