HD 171819

Last updated
HD 171819
Telescopium constellation map.svg
Red circle.svg
Location of HD 171819 (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 39m 14.29289s [1]
Declination −47° 54′ 35.1520″ [1]
Apparent magnitude  (V)5.84±0.01 [2]
Characteristics
Spectral type A7 IV/V [3] or A3 V [4]
B−V color index +0.23 [5]
Astrometry
Radial velocity (Rv)−9±4.3 [6]  km/s
Proper motion (μ)RA: +25.426  mas/yr [1]
Dec.: +13.951  mas/yr [1]
Parallax (π)10.4348 ± 0.1045  mas [1]
Distance 313 ± 3  ly
(95.8 ± 1.0  pc)
Absolute magnitude  (MV)+0.65 [7]
Details
Mass 1.73+0.37
−0.19 [8]   M☉
Radius 3.37±0.17 [9]   R☉
Luminosity 33.3±0.1 [1]   L☉
Surface gravity (log g)3.60±0.08 [8]   cgs
Temperature 7,512 [10]   K
Metallicity [Fe/H]−0.02 [11]   dex
Age 855 [1]   Myr
Other designations
22 G. Telescopii [12] , CD−48°12644, CPD−48°9900, FK5  3482, GC  25474, HD  171819, HIP  91461, HR  6986, SAO  229165 [13]
Database references
SIMBAD data

HD 171819, also known as HR 6986 or rarely 22 G. Telescopii, is a solitary star [14] located in the southern constellation Telescopium. It is faintly visible to the naked eye as a white-hued object with an apparent magnitude of 5.84. [2] The object is located relatively close at a distance of 313 light years based on Gaia DR3 parallax measurements, but it is approaching the Solar System with a heliocentric radial velocity of −9  km/s . [6] At its current distance, HD 171819's brightness is diminished by one-quarter of a magnitude due to interstellar dust [15] and it has an absolute magnitude of +0.65. [7]

HD 171819 has a stellar classification of A7 IV/V, indicating that the object is a late A-type star with the blended luminosity class of a main sequence star and subgiant. [3] However, astronomer William Buscombe gave it a class of A3 V, [4] instead making it an ordinary A-type main-sequence star. Evolutionary models give it an age of 855 million years and place it towards the end of its main-sequence life. [1] At present it has 1.73 times the mass of the Sun [8] and a slightly enlarged radius 3.37 times that of the Sun. [9] It radiates 33.3 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 7,512  K . [10] HD 171819 has a near solar metallicity at [Fe/H] = −0.02. [11]

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<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

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<span class="mw-page-title-main">HD 198716</span> Star in the constellation of Microscopium

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

HD 168592, also designated as HR 6862 or rarely 7 G. Coronae Australis, is a solitary star located in the southern constellation Corona Australis. It is faintly visible to the naked eye as an orange-hued star with an apparent magnitude of 5.07. Gaia DR3 parallax measurements place it at a distance of 490 light years and is currently receding with a heliocentric radial velocity of 18 km/s. At its current distance, HD 168592's brightness is diminished by 0.38 magnitudes due to interstellar dust. It has an absolute magnitude of −0.76.

<span class="mw-page-title-main">HD 23005</span> Star in Camelopardlis

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HD 99015, also known as HR 4397 or rarely 31 G. Chamaeleontis, is a solitary white-hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.42, placing it near the limit for naked eye visibility even in ideal conditions. The object is located relatively close at a distance of 243 light years and is drifting closer with a somewhat constrained heliocentric radial velocity of −5.9 km/s. At its current distance, HD 99015's brightness is diminished by 0.31 magnitudes due to interstellar dust. It has an absolute magnitude of +2.08.

<span class="mw-page-title-main">HD 174474</span> High proper motion star; Telescopium

HD 174474, also designated as HR 7095 or rarely 35 G. Telescopii, is a solitary white-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.17, placing it near the limit for naked eye visibility. The object is located relatively close at a distance of 244 light years based on Gaia DR3 parallax measurements but is drifting closer with a heliocentric radial velocity of −44 km/s. At its current distance, HD 174474's brightness is diminished by 0.26 magnitudes due to interstellar dust. It has an absolute magnitude of +1.61.

<span class="mw-page-title-main">HD 177406</span> Star in the constellation of Telescopium

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References

  1. 1 2 3 4 5 6 7 8 9 Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics . arXiv: 2208.00211 . doi: 10.1051/0004-6361/202243940 . Gaia DR3 record for this source at VizieR.
  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.
  3. 1 2 Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  4. 1 2 Buscombe, W. (1 May 1969). "Line Strengths for Southern OB stars--II: Observations with Moderate Dispersion". Monthly Notices of the Royal Astronomical Society. 144 (1): 31–39. Bibcode:1969MNRAS.144...31B. doi: 10.1093/mnras/144.1.31 . ISSN   0035-8711.
  5. ↑ Stoy, R. H. (1968). "Photoelectric Magnitudes and Colours for Bright Southern Stars". Monthly Notes of the Astronomical Society of South Africa. 27: 119. Bibcode:1968MNSSA..27..119S. ISSN   0024-8266.
  6. 1 2 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.
  7. 1 2 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.
  8. 1 2 3 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881. hdl: 1721.1/124721 . S2CID   166227927.
  9. 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 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. S2CID   6077801.
  10. 1 2 Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; 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. S2CID   73582386.
  11. 1 2 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN   1562-6873. ISSN   1063-7737. S2CID   118345778.
  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. ↑ "HD 171819". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved March 26, 2022.
  14. ↑ 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.
  15. ↑ 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.
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