Astronomy:10 Delphini
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Short description: K-type star in the constellation Delphinus
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 41m 16.2079s[1] |
| Declination | +14° 34′ 58.3606″[1] |
| Apparent magnitude (V) | 6.00±0.01[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| U−B color index | +1.44[4] |
| B−V color index | +1.24[5] |
| Astrometry | |
| Radial velocity (Rv) | −32±2[6] km/s |
| Proper motion (μ) | RA: −9.462[1] mas/yr Dec.: −0.344[1] mas/yr |
| Parallax (π) | 6.6178 ± 0.0397[1] mas |
| Distance | 493 ± 3 ly (151.1 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.06[7] |
| Details | |
| Mass | 2.42±0.71[8] M☉ |
| Radius | 18.47+1.02−1.03[9] R☉ |
| Luminosity | 125±2[9] L☉ |
| Surface gravity (log g) | 2.27[10] cgs |
| Temperature | 4,378[10] K |
| Metallicity [Fe/H] | 0.00[10] dex |
| Age | 794±33[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
10 Delphini (10 Del) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.00, allowing it to be faintly seen with the naked eye. Parallax measurements put the object at a distance of 493 light years but is drifting closer with a heliocentric radial velocity of −32 km/s.
10 Delphini has a stellar classification of K4 III[3] or K2 III,[11] both indicating that it is a red giant. However, there is some uncertainty behind the first classification. It has twice the mass of the Sun[8] but at an age of 794 million years[8] — expanded to 18 times the radius of the Sun.[9] It shines at 125 solar luminosity[9] from its enlarged photosphere at an effective temperature of 4,378 K,[10] giving it an orange glow. 10 Del has a solar metallicity.[10]
10 Del has been suspected to be a variable star, although it hasn't been catalogued as such in the GCVS.[12]
References
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 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 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal 81: 187. doi:10.1086/143628. ISSN 0004-637X. Bibcode: 1935ApJ....81..187A.
- ↑ Paunzen, E. (May 2022). "Catalogue of stars measured in the Geneva seven-colour photometric system". Astronomy & Astrophysics 661: A89. doi:10.1051/0004-6361/202142355. ISSN 0004-6361. Bibcode: 2022A&A...661A..89P.
- ↑ Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode: 1970Priv.........0H.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ 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.
- ↑ 8.0 8.1 8.2 8.3 Feuillet, Diane K.; Bovy, Jo; Holtzman, Jon; Girardi, Léo; MacDonald, Nick; Majewski, Steven R.; Nidever, David L. (20 January 2016). "Determining Ages of Apogee Giants with Known Distances". The Astrophysical Journal 817 (1): 40. doi:10.3847/0004-637X/817/1/40. Bibcode: 2016ApJ...817...40F.
- ↑ 9.0 9.1 9.2 9.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 10.0 10.1 10.2 10.3 10.4 Forsberg, R.; Jönsson, H.; Ryde, N.; Matteucci, F. (November 2019). "Abundances of disk and bulge giants from high-resolution optical spectra". Astronomy & Astrophysics 631: A113. doi:10.1051/0004-6361/201936343. ISSN 0004-6361. Bibcode: 2019A&A...631A.113F.
- ↑ Bartkevicius, A.; Lazauskaite, R. (1 January 1997). "Classification of Population II Stars in the Vilnius Photometric System. II. Results". Open Astronomy 6 (4): 499. doi:10.1515/astro-1997-0402. Bibcode: 1997BaltA...6..499B.
- ↑ Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80–88. doi:10.1134/S1063772917010085. ISSN 1063-7729. Bibcode: 2017ARep...61...80S.
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