Astronomy:Gamma1 Octantis
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Short description: Yellow-hued giant star in the constellation Octans
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Octans |
| Right ascension | 23h 52m 06.47318s[1] |
| Declination | −82° 01′ 07.7636″[1] |
| Apparent magnitude (V) | 5.10[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | G7III[4] |
| U−B color index | +0.60[5] |
| B−V color index | +0.92[5] |
| Astrometry | |
| Radial velocity (Rv) | +15.4±0.1[6] km/s |
| Proper motion (μ) | RA: −45.670[1] mas/yr Dec.: −15.666[1] mas/yr |
| Parallax (π) | 12.1790 ± 0.0552[1] mas |
| Distance | 268 ± 1 ly (82.1 ± 0.4 pc) |
| Absolute magnitude (MV) | 0.55[2] |
| Details | |
| Mass | 1.81[7] M☉ |
| Radius | 10.3[8] R☉ |
| Luminosity | 60[8] L☉ |
| Surface gravity (log g) | 2.64[7] cgs |
| Temperature | 5,017[8] K |
| Metallicity [Fe/H] | −0.34[9] dex |
| Rotational velocity (v sin i) | 1.8[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gamma1 Octantis, Latinized from γ1 Octantis, is a single,[13] yellow-hued star in the constellation which includes the southern celestial pole, Octans. Its apparent visual magnitude is 5.10,[2] meaning that in good conditions it is bright enough to be faintly visible to the naked eye.
Distance and proper motion
Based upon an annual parallax shift of 12.2 mas which is taken during opposing points of the Earth's orbit of the sun (with compensation for its eccentricity),[1] the star is about 268 light years away. Its (proper) motion has a net vector at present of receding from the Sun, at +15.4 km/s.[6]
Characteristics
This is an evolved G-type giant star with a stellar classification of G7 III.[4] It is a red clump star,[3] which means it is generating energy through helium fusion at its core. The star has an estimated 1.81 times the mass of the Sun[7] and it has expanded to over 10 times the Sun's radius and is radiating 60 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,017 K.[8]
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 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ 3.0 3.1 Gontcharov, G. A. (2009). "Red giant clump in the Tycho-2 catalogue". Astronomy Letters 34 (11): 785–796. doi:10.1134/S1063773708110078. Bibcode: 2008AstL...34..785G. Vizier catalog entry
- ↑ 4.0 4.1 Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050. Bibcode: 1995yCat.5050....0H.
- ↑ 5.0 5.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M.Vizier catalog entry
- ↑ 6.0 6.1 Gontcharov, G. A. (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. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 7.2 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A. Vizier catalog entry
- ↑ 8.0 8.1 8.2 8.3 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F.
- ↑ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics 591: A118. doi:10.1051/0004-6361/201628497. Bibcode: 2016A&A...591A.118S.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
- ↑ "HD 223647". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+223647.
- ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino 1. Bibcode: 1879RNAO....1.....G.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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