Astronomy:HD 198716

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Short description: Star in the constellation of Microscopium
HD 198716
Microscopium constellation map.svg
Red circle.svg
HD 198716 is the star circled in red
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Microscopium
Right ascension  20h 53m 40.18538s[1]
Declination −39° 48′ 35.5092″[1]
Apparent magnitude (V) 5.33±0.01[2]
Characteristics
Spectral type K2 III[3]
B−V color index +1.32[4]
Astrometry
Radial velocity (Rv)20.1±2.8[5] km/s
Proper motion (μ) RA: +43.548[1] mas/yr
Dec.: −97.023[1] mas/yr
Parallax (π)8.2435 ± 0.0774[1] mas
Distance396 ± 4 ly
(121 ± 1 pc)
Absolute magnitude (MV)−0.1[6]
Details
Mass2.45±0.12[7] M☉
Radius23.9[8] R☉
Luminosity160±3[1] L☉
Surface gravity (log g)1.41±0.01[9] cgs
Temperature4,453±122[10] K
Metallicity [Fe/H]−0.04[11] dex
Rotational velocity (v sin i)2±1.3[12] km/s
Age622+275−64[1] Myr
Other designations
CD−40°14078, CPD−40°9399, GC 29127, HD 198716, HIP 103127, HR 7987, SAO 212522[13]
Database references
SIMBADdata

HD 198716, also known as HR 7987 or 33 G. Microscopii, is a solitary star[14] located in the southern constellation Microscopium. Eggen (1993) lists it as a member of the Milky Way's old disk population.[11]

The object has an apparent magnitude of 5.33,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, it is estimated to be 396 light years away from the Solar System.[1] However, it is drifting closer with a somewhat constrained heliocentric radial velocity of 20 km/s.[5] At its current distance, HD 198716's brightness is diminished by 0.1 magnitude due to interstellar dust.[15]

This is an evolved red giant star with a stellar classification of K2 III. It has 2.45 times the mass of the Sun[7] but at an age of 622 million years,[1] it has expanded to 23.9 times the Sun's radius.[8] It radiates 160 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,453 K,[10] giving it an orange hue. HD 198716 is slightly metal deficient and spins moderately with a projected rotational velocity of 2 km/s.[12]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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. ↑ 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. ↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode: 1982mcts.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. ↑ 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. ↑ 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. ↑ 7.0 7.1 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2". Astronomy & Astrophysics 623 (4): A72. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Bibcode: 2019MNRAS.484.4619G. 
  8. ↑ 8.0 8.1 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  9. ↑ Poggio, E.; Recio-Blanco, A.; Palicio, P. A.; Re Fiorentin, P.; de Laverny, P.; Drimmel, R.; Kordopatis, G.; Lattanzi, M. G. et al. (30 September 2022). "The chemical signature of the Galactic spiral arms revealed by Gaia DR3". Astronomy & Astrophysics 666: L4. doi:10.1051/0004-6361/202244361. ISSN 0004-6361. Bibcode: 2022A&A...666L...4P. 
  10. ↑ 10.0 10.1 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  11. ↑ 11.0 11.1 Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal 106: 80. doi:10.1086/116622. Bibcode: 1993AJ....106...80E. 
  12. ↑ 12.0 12.1 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". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D. 
  13. ↑ "HD 198716". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+198716. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
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