Astronomy:HD 23474
Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
---|---|
Constellation | Mensa |
Right ascension | 03h 36m 30.1435s[1] |
Declination | −78° 19′ 23.0623″[1] |
Apparent magnitude (V) | 6.30±0.01[2] |
Characteristics | |
Spectral type | K2 III[3] |
U−B color index | +1.03[4] |
B−V color index | +1.15[4] |
Astrometry | |
Radial velocity (Rv) | 2.4±0.4[5] km/s |
Proper motion (μ) | RA: −14.12[1] mas/yr Dec.: +6.67[1] mas/yr |
Parallax (π) | 4.34 ± 0.36[1] mas |
Distance | 750 ± 60 ly (230 ± 20 pc) |
Absolute magnitude (MV) | −0.50[6] |
Details | |
Mass | 1.21[7] M☉ |
Radius | 33.51±7.44[8] R☉ |
Luminosity | 227[9] L☉ |
Surface gravity (log g) | 1.22[8] cgs |
Temperature | 4,556[9] K |
Metallicity [Fe/H] | −0.03[7] dex |
Rotational velocity (v sin i) | 1.2±1.3[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 23474 (HR 1154) is a double star[13] in the southern circumpolar constellation Mensa. It has an apparent magnitude of 6.30, placing it near the max naked eye visibility. The system is situated at a distance of about 750 light years and is currently receding with a heliocentric radial velocity of 2.4 km/s.
As of 2018, the pair have a separation of 0.2 arcseconds along a position angle of 92°.[13]
The primary or visible component has a stellar classification of K2 III, indicating that it is a red giant. As a result, it has expanded to a diameter of 33.51 R☉[8] and has an effective temperature of 4,556 K,[9] giving an orange hue. It has 121% the mass of the Sun and shines with a luminosity of 227 solar luminosity[9] from its enlarged photosphere. HD 23474 spins with a poorly constrained projected rotational velocity of 1.2 km/s[10] and has a metallicity around solar level.[7]
References
- ↑ 1.0 1.1 1.2 1.3 Template:Cite New HIP red.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 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.
- ↑ 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ 8.0 8.1 8.2 Stassun, Keivan G. et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal 156 (3): 102. doi:10.3847/1538-3881/aad050. Bibcode: 2018AJ....156..102S.
- ↑ 9.0 9.1 9.2 9.3 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M.
- ↑ 10.0 10.1 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. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ "HD 23474". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+23474.
- ↑ 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.
- ↑ 13.0 13.1 Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
Original source: https://en.wikipedia.org/wiki/HD 23474.
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