15 Delphini

15 Delphini (15 Del) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.99,[2] allowing it to be faintly seen with the naked eye. The star is relatively close at a distance of 99 light years[1] but is receding with a heliocentric radial velocity of 4.1 km/s.[5]

15 Delphini
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 49m 37.7673s[1]
Declination +12° 32′ 42.4589″[1]
Apparent magnitude (V) 5.99±0.01[2]
Characteristics
Spectral type F5 V[3]
U−B color index −0.06[4]
B−V color index +0.42[4]
Astrometry
Radial velocity (Rv)4.1±0.4[5] km/s
Proper motion (μ) RA: +52.776 mas/yr[1]
Dec.: +97.020 mas/yr[1]
Parallax (π)33.0028 ± 0.0322 mas[1]
Distance98.83 ± 0.10 ly
(30.30 ± 0.03 pc)
Absolute magnitude (MV)+3.58[6]
Details
Mass1.23[7] M☉
Radius1.42+0.02
−0.04[8] R☉
Luminosity3.01±0.01[8] L☉
Surface gravity (log g)4.24[7] cgs
Temperature6,624±50[9] K
Metallicity [Fe/H]−0.13±0.03[9] dex
Rotational velocity (v sin i)5.6±0.3[10] km/s
Age1.21±0.63[9] Gyr
Other designations
15 Del, AG+12°2395, BD+12°4472, GC 29037, HD 198390, HIP 102805, HR 7973, SAO 106536, WDS J20496+1233A[11]
Database references
SIMBADdata

15 Del has a stellar classification of F5 V,[3] indicating that it is an ordinary F-type main-sequence star. It has 123% the mass of the Sun[7] and a diameter of 1.42 R☉.[8] It radiates at 3 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 6,624 K,[9] giving a yellow-white hue. 15 Del has an iron abundance 74% that of the Sun and at an age of 1.21 billion years[9] — spins leisurely with a projected rotational velocity of 5.6 km/s.[10]

15 Delphini has 3 companions listed below. Components B and D have different proper motions compared to the host. However, C appears to have a common proper motion, suggesting physical relation,[12] but its parallax indicates a further distance compared to 15 Delphini.[13]

15 Delphini's companions[12]
Companion mv PA (°) Year Sep. (″)
B 14.10 19 2013 52.1
C 11.07 86 2020 105.5
D 11.89 276 2020 189.6

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  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.
  3. Chen, Y. Q.; Nissen, P. E.; Zhao, G.; Zhang, H. W.; Benoni, T. (February 2000). "Chemical composition of 90 F and G disk dwarfs". Astronomy and Astrophysics Supplement Series. 141 (3): 491–506. arXiv:astro-ph/9912342. Bibcode:2000A&AS..141..491C. doi:10.1051/aas:2000124. eISSN 1286-4846. ISSN 0365-0138.
  4. Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. 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. ISSN 1063-7737. S2CID 119231169.
  6. 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. ISSN 1063-7737. S2CID 255204555.
  7. David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. ISSN 0004-637X.
  8. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  9. Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. eISSN 1432-0746. ISSN 0004-6361.
  10. Groot, P. J.; Piters, A. J. M.; Paradijs, van (September 1996). "Rotational velocities of F dwarfs; application of the Fourier-Bessel transformation method". Astronomy and Astrophysics Supplement Series. 118 (3): 545–555. Bibcode:1996A&AS..118..545G. doi:10.1051/aas:1996214. ISSN 0365-0138.
  11. "15 Del". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 16, 2022.
  12. 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.
  13. 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.
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