15 Lacertae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 52m 02.03323s[1] |
| Declination | +43° 18′ 44.7028″[1] |
| Apparent magnitude (V) | 4.95[2] + 11.9[3] |
| Characteristics | |
| Spectral type | M0 III[4] |
| B−V color index | 1.559±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.21±0.20[2] km/s |
| Proper motion (μ) | RA: +109.890±0.214[1] mas/yr Dec.: +23.581±0.215[1] mas/yr |
| Parallax (π) | 9.6841±0.1425 mas[1] |
| Distance | 337 ± 5 ly (103 ± 2 pc) |
| Absolute magnitude (MV) | −0.04[2] |
| Details | |
| Mass | 1.3[5] M☉ |
| Radius | 35[6] R☉ |
| Luminosity | 269[6] L☉ |
| Surface gravity (log g) | 1.79[5] cgs |
| Temperature | 4,047[5] K |
| Metallicity [Fe/H] | −0.22[5] dex |
| Age | 12.7[7] Gyr |
| Other designations | |
| 15 Lac, BD+42°4521, GC 31896, HD 216397, HIP 112917, HR 8699, SAO 52436, WDS J22520+4319[8] | |
| Database references | |
| SIMBAD | data |
15 Lacertae is a binary star[9] system in the northern constellation of Lacerta, near the southeast constellation border with Andromeda. It is faintly visible to the naked eye with an apparent visual magnitude of 4.95.[2] The distance to this system is approximately 337 light years based on parallax.[1] It is drifting closer to the Sun with a radial velocity of −19 km/s.[2] The absolute magnitude of 15 Lacertae is −0.04.[2]
The primary component is an aging red giant with a stellar classification of M0 III.[4] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 35 times the Sun's radius.[6] It is radiating 269 times the luminosity of the Sun[6] from its swollen photosphere at an effective temperature of 4,047 K[5] giving it a reddish hue.
The secondary companion was discovered by American astronomer S. W. Burnham in 1888. It has a visual magnitude of 11.9 and is located at an angular separation of 23.6″ from the primary along a position angle of 159°, as of 2014.[3]
References
- ^ a b c d e f 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.
- ^ a b c d e f g 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. S2CID 119257644.
- ^ a b Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ a b Abt, H. A. (September 1985), "Visual multiples. VIII - 1000 MK types", Astrophysical Journal Supplement Series, 59: 95–112, Bibcode:1985ApJS...59...95A, doi:10.1086/191064
- ^ a b c d e Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ a b c d Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series. 268 (1): 4. arXiv:2208.11721. Bibcode:2023ApJS..268....4F. doi:10.3847/1538-4365/acdee5.
- ^ Kordopatis, G.; et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics. 669: A104. arXiv:2206.07937. Bibcode:2023A&A...669A.104K. doi:10.1051/0004-6361/202244283.
- ^ "15 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-10.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.