HD 198404

Last updated
HD 198404
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus [1]
Right ascension 20h 49m 59.0925s [2]
Declination +05° 32′ 40.508″ [2]
Apparent magnitude  (V)6.19±0.01 [3]
Characteristics
Spectral type K0 [4]
U−B color index +0.79 [5]
B−V color index +0.98 [5]
Astrometry
Radial velocity (Rv)−21.63±0.31 [6] km/s
Proper motion (μ)RA: +43.408 mas/yr [2]
Dec.: −0.174 mas/yr [2]
Parallax (π)8.2537±0.1261  mas [2]
Distance 395 ± 6  ly
(121 ± 2  pc)
Absolute magnitude  (MV)+0.7 [1]
Details
Mass 3.12 [7]   M☉
Radius 10.54 [8]   R☉
Luminosity 56.3 [9]   L☉
Surface gravity (log g)2.8 [7]   cgs
Temperature 4,809 [10]   K
Metallicity [Fe/H]+0.17 [7]   dex
Other designations
21 G. Delphini, AG+05°3046, BD+05°4626, GC 29044, HD 198404, HIP 102833, HR 7975, SAO 126267, WDS J20500+0533A [11] [12]
Database references
SIMBAD data

HD 198404 (HR 7975) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.19, [3] allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 395 light years [2] and it is approaching the Solar System with a heliocentric radial velocity of −21.6  km/s . [6]

HD 198404 has a simple stellar classification of K0, [4] indicating that it is a K-type star. Its enlarged diameter of 10.54  R☉ [8] and its low surface gravity [7] suggest that it has evolved away from the main sequence to become a giant star. [7] HD 198404 has 3.12 times the mass of the Sun [7] and radiates at 56 times the luminosity of the Sun [9] from its photosphere at an effective temperature of 4,809  K , [10] giving it a yellowish orange hue. The star is metal enriched, having an iron abundance 48% greater than that of the Sun. [7]

HD 198404 has an optical companion located 78.2″ away along a position angle of 127° (as of 2014). [13]

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 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.
  4. 1 2 Cannon, Annie Jump; Pickering, Edward Charles (1923). "The Henry Draper catalogue : 19h and 20h". Annals of Harvard College Observatory. 98: 1. Bibcode:1923AnHar..98....1C.
  5. 1 2 Cousins, A. W. J. (16 November 1964). "Photometric Data for Stars in the Equatorial Zone (Seventh List)". Monthly Notes of the Astronomical Society of South Africa. 23: 175. Bibcode:1964MNSSA..23..175C. ISSN   0024-8266.
  6. 1 2 Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (January 2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv: astro-ph/0409579 . Bibcode:2005A&A...430..165F. doi: 10.1051/0004-6361:20041272 . S2CID   17804304.
  7. 1 2 3 4 5 6 7 Liu, Y. J.; Tan, K. F.; Wang, L.; Zhao, G.; Sato, Bun'ei; Takeda, Y.; Li, H. N. (31 March 2014). "The Lithium Abundances of a Large Sample of Red Giants". The Astrophysical Journal. 785 (2): 94. arXiv: 1404.1687 . Bibcode:2014ApJ...785...94L. doi: 10.1088/0004-637X/785/2/94 . eISSN   1538-4357. ISSN   0004-637X.
  8. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x . ISSN   0035-8711.
  10. 1 2 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765 . ISSN   0004-6361.
  11. ↑ "HR 7975". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 21, 2022.
  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. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.