Astronomy:HD 190422
Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
---|---|
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[1] mas/yr Dec.: +35.310[1] mas/yr |
Parallax (π) | 41.5069 ± 0.028[1] mas |
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 | |
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[15] 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.[16]
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.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 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. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G.
- ↑ 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.
- ↑ 5.0 5.1 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.
- ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 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. doi:10.3847/0004-6256/151/3/59. Bibcode: 2016AJ....151...59C.
- ↑ 8.0 8.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K.
- ↑ 9.0 9.1 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. doi:10.1051/0004-6361/201016276. ISSN 0004-6361. Bibcode: 2011A&A...530A.138C.
- ↑ 10.0 10.1 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. doi:10.1093/mnras/stx1077. ISSN 0035-8711. Bibcode: 2017MNRAS.469.3042N.
- ↑ Oelkers, Ryan J.; Rodriguez, Joseph E.; Stassun, Keivan G.; Pepper, Joshua; Somers, Garrett; Kafka, Stella; Stevens, Daniel J.; Beatty, Thomas G. et al. (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. doi:10.3847/1538-3881/aa9bf4. Bibcode: 2018AJ....155...39O.
- ↑ 12.0 12.1 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. doi:10.1051/0004-6361/201118724. ISSN 0004-6361. Bibcode: 2012A&A...542A.116A.
- ↑ 13.0 13.1 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. doi:10.1086/117796. ISSN 0004-6256. Bibcode: 1996AJ....111..439H.
- ↑ "HD 190422". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+190422.
- ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
- ↑ Bailer-Jones, C. A. L. (19 February 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics 575: A35. doi:10.1051/0004-6361/201425221. ISSN 0004-6361. Bibcode: 2015A&A...575A..35B.
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Original source: https://en.wikipedia.org/wiki/HD 190422.
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