Astronomy:15 Delphini
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 49m 37.7673s[1] |
| Declination | +12° 32′ 42.459″[1] |
| Apparent magnitude (V) | 5.99±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| 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[1] mas/yr Dec.: +97.020[1] mas/yr |
| Parallax (π) | 33.0028 ± 0.0322[1] mas |
| Distance | 98.83 ± 0.10 ly (30.30 ± 0.03 pc) |
| Absolute magnitude (MV) | +3.58[6] |
| Details | |
| Mass | 1.28[7] M☉ |
| Radius | 1.40[7] R☉ |
| Luminosity | 2.98[7] L☉ |
| Surface gravity (log g) | 4.25[7] cgs |
| Temperature | 6,624±50[8] K |
| Metallicity [Fe/H] | −0.13±0.03[8] dex |
| Rotational velocity (v sin i) | 5.6±0.3[9] km/s |
| Age | 1.21±0.63[8] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
15 Delphini (15 Del) is a star in the northern constellation of 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 Del has a stellar classification of F5 V,[3] indicating that it is an ordinary F-type main-sequence star. It has 128% the mass of the Sun and a radius of 1.4 R☉.[7] It radiates at 3 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 6,624 K,[8] 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[8] — spins leisurely with a projected rotational velocity of 5.6 km/s.[9]
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,[11] but its parallax indicates a further distance compared to 15 Delphini.[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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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 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. doi:10.1051/aas:2000124. ISSN 0365-0138. Bibcode: 2000A&AS..141..491C.
- ↑ 4.0 4.1 Mermilliod, J. -C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ 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.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Stassun, Keivan G. et al. (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.
- ↑ 8.0 8.1 8.2 8.3 8.4 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E. et al. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics 646: A77. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Bibcode: 2021A&A...646A..77G.
- ↑ 9.0 9.1 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. doi:10.1051/aas:1996214. ISSN 0365-0138. Bibcode: 1996A&AS..118..545G.
- ↑ "15 Del". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=15+Del.
- ↑ 11.0 11.1 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
- ↑ 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.
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