HD 169904

Last updated
HD 169904
Octans constellation map.svg
Red circle.svg
Location of HD 204904 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 18h 42m 14.42015s [1]
Declination −81° 48′ 29.2064″ [1]
Apparent magnitude  (V)6.26±0.01 [2]
Characteristics
Evolutionary stage main sequence star [3]
Spectral type B8 V [4]
U−B color index −0.37 [5]
B−V color index −0.13 [5]
Variable type suspected [6]
Astrometry
Radial velocity (Rv)−6.0±4.3 [7]  km/s
Proper motion (μ)RA: +13.838  mas/yr [1]
Dec.: −16.605  mas/yr [1]
Parallax (π)6.7598 ± 0.0413  mas [1]
Distance 482 ± 3  ly
(147.9 ± 0.9  pc)
Absolute magnitude  (MV)+0.19 [8]
Details
Mass 3.25±0.06 [3]   M☉
Radius 2.42±0.12 [9]   R☉
Luminosity 141+14
−13 [3]   L☉
Surface gravity (log g)4.20 [10]   cgs
Temperature 13,622 [11]   K
Metallicity [Fe/H]−0.18 [12]   dex
Rotational velocity (v sin i)123 [13]  km/s
Other designations
35 G. Octantis [14] , NSV  24510, CD−81°693, CPD−81°813, GC  25366, HD  169904, HIP  91723, HR  6912, SAO  258804, TIC  351920521 [15]
Database references
SIMBAD data

HD 169904 (HR 6912; 35 G. Octantis) is a solitary star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.26, [2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 482 light-years [1] and it is currently drifting closer with a somewhat constrained radial velocity of −6.0  km/s . [7] At its current distance, HD 169904's brightness is diminished by 0.24 magnitudes due to interstellar extinction [16] and it has an absolute magnitude of +0.19. [8]

HD 169904 has a stellar classification of B8 V, [4] indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 3.25 times the mass of the Sun [3] and 2.42 times the radius of the Sun. [9] It radiates 141 times the luminosity of the Sun [3] from its photosphere at an effective temperature of 13,622  K , [11] giving it a blue-white hue when viewed in the night sky. HD 169904 is metal deficient with an iron abundance of [Fe/H] = −0.18 or 66.1% of the Sun's, [12] and it spins rapidly with a projected rotational velocity of 123  km/s . [13] HD 169904 is estimated to have completed 47.5% of its main sequence lifetime. [3]

The object was listed as a suspected variable star based on photometric observations, [6] but subsequent observations have not confirmed this. [17]

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<span class="mw-page-title-main">HD 101917</span> High proper motion star

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References

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  2. 1 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. S2CID   17128864.
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  5. 1 2 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.
  6. 1 2 Grønbech, B.; Olsen, E. H. (July 1976). "Four-color uvby photometry for bright O to G0 type stars south of declination +10 ". Astronomy and Astrophysics Supplement Series. 25: 213–270. Bibcode:1976A&AS...25..213G. ISSN   0365-0138. S2CID   118304388.
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  9. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv: astro-ph/0404180 . Bibcode:2004A&A...426..297K. doi: 10.1051/0004-6361:20035930 . eISSN   1432-0746. ISSN   0004-6361.
  10. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 . eISSN   1365-2966. ISSN   0035-8711. S2CID   73594365.
  11. 1 2 Philip, A. G. D.; Egret, D. (May 1980). "An analysis of the Hauck-Mermillod catalogue of homogeneous four-color data. II". Astronomy and Astrophysics Supplement Series. 40: 199–205. Bibcode:1980A&AS...40..199P. ISSN   0365-0138.
  12. 1 2 Anders, F.; et al. (February 2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy & Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi: 10.1051/0004-6361/202142369 . eISSN   1432-0746. ISSN   0004-6361.
  13. 1 2 Levato, Hugo; Grosso, Mónica (June 2004). "New Projected Rotational Velocities of All Southern B-type Stars of the Bright Star Catalogue". Symposium - International Astronomical Union. 215: 51–52. Bibcode:2004IAUS..215...51L. doi: 10.1017/S0074180900195191 . ISSN   0074-1809.
  14. ↑ 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.
  15. ↑ "HD 169904". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 4, 2023.
  16. ↑ 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.
  17. ↑ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.
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