11 Trianguli
  | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 27m 27.771s |
| Declination | +31° 48′ 04.61″ |
| Apparent magnitude (V) | 5.55 |
| Characteristics | |
| Evolutionary stage | horizontal branch |
| Spectral type | K1 III |
| B−V color index | +1.1 |
| Astrometry | |
| Radial velocity (Rv) | −41.614±0.163 km/s |
| Proper motion (μ) | RA: −24.331 mas/yr Dec.: −27.845 mas/yr |
| Parallax (π) | 11.6240±0.1293 mas |
| Distance | 281 ± 3 ly (86.0 ± 1.0 pc) |
| Absolute magnitude (MV) | 0.836 |
| Details | |
| Mass | 2.446±0.122 M☉ |
| Radius | 12.055±0.603 R☉ |
| Luminosity | 54.6±3.8 L☉ |
| Surface gravity (log g) | 2.2 cgs |
| Temperature | 4,572 K |
| Metallicity [Fe/H] | −0.19 dex |
| Age | 6.3+2.8 −1.4 Gyr |
| Other designations | |
| 11 Trianguli, AG+31° 231, BD+31°427, GC 2943, HD 15176, HIP 11432, HR 712, SAO 55570 | |
| Database references | |
| SIMBAD | data |
11 Trianguli is a solitary star located in the northern constellation Triangulum, with an apparent magnitude of 5.55. The star is situated 281 light years away but is approaching with a heliocentric radial velocity of −41.614 km/s. It is probably on the horizontal branch fusing helium in its core, and is calculated to be about 6.3 Gyr old. It has a stellar classification of K1 III. It has 2.446 times the mass of the Sun and 12.055 times the radius of the Sun. It shines at 54.6 times the luminosity of the Sun from its photosphere at an effective temperature of 4,572 K.
It was once designated d Trianguli by John Flamsteed and was included in his Atlas Coelestis, but the designation is now dropped.
References
- 1 2 3 4 5 6 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.
- 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- 1 2 3 4 Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:1805.04094, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, S2CID 119361866, A33.
- 1 2 Hinkel, Natalie R.; Unterborn, Cayman; Kane, Stephen R.; Somers, Garrett; Galvez, Richard (2019). "A Recommendation Algorithm to Predict Giant Exoplanet Host Stars Using Stellar Elemental Abundances". The Astrophysical Journal. 880 (1): 49. arXiv:1805.12144. Bibcode:2019ApJ...880...49H. doi:10.3847/1538-4357/ab27c0.
- 1 2 Cruzalèbes, P.; et al. (2019). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490 (3): 3158–3176. arXiv:1910.00542. Bibcode:2019MNRAS.490.3158C. doi:10.1093/mnras/stz2803.
- 1 2 Brandt, Timothy D. (2021). "The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series. 254 (2): 42. arXiv:2105.11662. Bibcode:2021ApJS..254...42B. doi:10.3847/1538-4365/abf93c.
- 1 2 Soubiran, C.; Bienayme, O.; Mishenina, T.V. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy & Astrophysics. 480 (1): 91–101. arXiv:0712.1370. Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
- 1 2 3 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly". Astronomy and Astrophysics. 623. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371.
- 1 2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise Radial Velocities of Giant Stars VII. Occurrence Rate of Giant Extrasolar Planets as a Function of Mass and Metallicity". Astronomy and Astrophysics. 574. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360.
- 1 2 3 Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
- ↑ Massarotti, Alessandro; Latham, D.W.; Stefanik, R.P.; Fogel, Jeffrey (2008). "Rotational and radial velocities for a sample of 761 Hipparcos giants and the role of binarity". The Astronomical Journal. 135 (1): 209. arXiv:0712.1370. Bibcode:2008AJ....135..209M. doi:10.1051/0004-6361:20078788.
- ↑ 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.
- ↑ Wagman, M. (August 1987), "Flamsteed's Missing Stars", Journal for the History of Astronomy, 18 (3): 209–223, Bibcode:1987JHA....18..209W, doi:10.1177/002182868701800305, S2CID 118445625.
