HD 190422

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HD 190422
Telescopium constellation map.svg
Red circle.svg
Location of HD 190422(circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 20h 07m 35.09061s [1]
Declination −55° 00′ 57.6492″ [1]
Apparent magnitude  (V)6.25±0.01 [2]
Characteristics
Spectral type F9 V CH−0.4 [3]
B−V color index +0.53 [4]
Astrometry
Radial velocity (Rv)12.7±0.3 [5]  km/s
Proper motion (μ)RA: +18.283  mas/yr [1]
Dec.: +35.310  mas/yr [1]
Parallax (π)41.5069 ± 0.028  mas [1]
Distance 78.58 ± 0.05  ly
(24.09 ± 0.02  pc)
Absolute magnitude  (MV)+4.41 [6]
Details
Mass 1.25 [7]   M☉
Radius 1.09±0.05 [8]   R☉
Luminosity 1.534+0.006
−0.005 [1]   L☉
Surface gravity (log g)4.42 [3]   cgs
Temperature 6,235±100 [9]   K
Metallicity [Fe/H]−0.13±0.03 [10]   dex
Rotation 27.2  d [11]
Rotational velocity (v sin i)15.6±0.8 [12]  km/s
Age 400 [13] [3]   Myr
Other designations
77 G. Telescopii [14] , CD−55°8393, CPD−55°9317, GC  27884, HD  190422, HIP  99137, HR  7674, SAO  246444 [15]
Database references
SIMBAD data

HD 190422, also known as HR 7674 or rarely 77 G. Telescopii, is a solitary star located in the southern constellation Telescopium. It has an apparent magnitude of +6.25, [2] placing it near the limit for naked eye, even under ideal conditions. At its current distance, HD 190422's brightness is diminished by 0.11 magnitudes due to extinction from interstellar dust [16] and it has an absolute magnitude of +4.41. [6]

The star is located relatively close at a distance of 79 light years based on Gaia DR3 parallax measurements [1] but it is receding with a heliocentric radial velocity of 12.7  km/s . [5] Approximately 1.6 million years ago, HD 190422 was located 7.806 parsecs (25.46  ly ) away from the Sun. [17]

HD 190422 has a stellar classification of F9 V CH−0.4, [3] indicating that it is a F-type main-sequence star with a mild underabundance of the CH radical in its spectrum. It has 125% the mass of the Sun [7] and 109% of the Sun's radius. [8] It radiates 1.534 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 6,235  K , [9] giving it a whitish-yellow hue. HD 190422 is slightly metal deficient with a metallicity of [Fe/H] = −0.13 [10] and it spins modestly with a projected rotational velocity of 15.6  km/s . [12] The star is estimated to be 400 million years old, [13] [3] less than a tenth the age of the Sun.

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<span class="mw-page-title-main">HD 193307</span> High proper motion star; Telescopium

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<span class="mw-page-title-main">HD 76236</span> Star in the constellation Chamaeleon

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HD 115088, also known as HIP 64951, is a star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.33, placing it near the limit for naked eye visibility. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 412 light years distant. At that distance, its brightness is diminished by 0.37 magnitudes due to interstellar dust.

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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.

References

  1. 1 2 3 4 5 6 7 8 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 3 4 5 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi: 10.1086/504637 . eISSN   1538-3881. ISSN   0004-6256. S2CID   250741593.
  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. S2CID   118307502.
  5. 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.
  6. 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.
  7. 1 2 Chandler, Colin Orion; McDonald, Iain; Kane, Stephen R. (17 February 2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv: 1510.05666 . Bibcode:2016AJ....151...59C. doi: 10.3847/0004-6256/151/3/59 . eISSN   1538-3881. S2CID   119246448.
  8. 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.
  9. 1 2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . eISSN   1432-0746. ISSN   0004-6361. S2CID   56118016.
  10. 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv: 1705.00883 . Bibcode:2017MNRAS.469.3042N. doi: 10.1093/mnras/stx1077 . eISSN   1365-2966. ISSN   0035-8711. S2CID   119034918.
  11. ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G.; Siverd, Robert J.; Lund, Michael B.; Kuhn, Rudolf B.; James, David; Gaudi, B. Scott (2018). "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey". The Astronomical Journal. 155 (1): 39. arXiv: 1711.03608 . Bibcode:2018AJ....155...39O. doi:10.3847/1538-3881/aa9bf4. S2CID   119515775.
  12. 1 2 Ammler-von Eiff, M.; Reiners, A. (June 2012). "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?". Astronomy & Astrophysics. 542: A116. arXiv: 1204.2459 . Bibcode:2012A&A...542A.116A. doi: 10.1051/0004-6361/201118724 . eISSN   1432-0746. ISSN   0004-6361. S2CID   53666672.
  13. 1 2 Henry, Todd J.; Soderblom, David R.; Donahue, Robert A.; Baliunas, Sallie L. (January 1996). "A Survey of CA II H and K Chromospheric Emission in Southern Solar-Type Stars". The Astronomical Journal. 111: 439. Bibcode:1996AJ....111..439H. doi: 10.1086/117796 . ISSN   0004-6256. S2CID   120627407.
  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 190422". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved March 31, 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. ↑ Bailer-Jones, C. A. L. (19 February 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics. 575: A35. arXiv: 1412.3648 . Bibcode:2015A&A...575A..35B. doi: 10.1051/0004-6361/201425221 . eISSN   1432-0746. ISSN   0004-6361. S2CID   59039482.
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