HD 23474

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.

HD 23474
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: +6.67 mas/yr[1]
Parallax (π)4.34 ± 0.36 mas[1]
Distance750 ± 60 ly
(230 ± 20 pc)
Absolute magnitude (MV)−0.50[6]
Details
Mass1.21[7] M☉
Radius33.51±7.44[8] R☉
Luminosity227[9] L☉
Surface gravity (log g)1.22[8] cgs
Temperature4,556[9] K
Metallicity [Fe/H]−0.03[7] dex
Rotational velocity (v sin i)1.2±1.3[10] km/s
Other designations
3 G. Mensae, CPD−78°105, FK5 2261, GC 4400, HD 23474, HIP 16827, HR 1154, SAO 256005, WDS J03365-7819AB[11][12]
Database references
SIMBADdata

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 L☉[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. van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.
  2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. 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. 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.
  5. 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. ISSN 1063-7737. S2CID 119231169.
  6. 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.
  7. 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. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
  8. Stassun, Keivan G.; et al. (20 August 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. eISSN 1538-3881.
  9. 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.
  10. 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. ISSN 0004-6361.
  11. "HD 23474". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 14, 2022.
  12. 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. 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. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
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