  | |
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 17h 36m 32.85514s [1] |
| Declination | −38° 38′ 06.8918″ [1] |
| Apparent magnitude (V) | 4.27±0.01 [2] |
| Characteristics | |
| Evolutionary stage | horizontal branch [3] |
| Spectral type | K0 IIIb [4] |
| U−B color index | +0.90 [5] |
| B−V color index | +1.08 [5] |
| Astrometry | |
| Radial velocity (Rv) | −49±3 [6] km/s |
| Proper motion (μ) |
RA: −16.762
mas/
yr
[1] Dec.: −218.275 mas/ yr [1] |
| Parallax (π) | 20.6922 ± 0.2161 mas [1] |
| Distance | 158 ± 2
ly (48.3 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.67 [7] |
| Details [8] | |
| Mass | 1.10±0.07 M☉ |
| Radius | 12.39±0.47 R☉ |
| Luminosity | 62.2±4.2 L☉ |
| Surface gravity (log g) | 2.41±0.11 cgs |
| Temperature | 4,605±40 K |
| Metallicity [Fe/H] | −0.28±0.02 dex |
| Rotational velocity (v sin i) | <1 [9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Q Scorpii, also designated as HD 159433, is an astrometric binary [12] (100% chance) [13] located in the southern zodiac constellation Scorpius. It has an apparent magnitude of 4.27, [2] making it readily visible to the naked eye under ideal conditions. It lies in the tail of Scorpius, between the stars λ Scorpii and μ Scorpii and is located 7 ′ away from the faint globular cluster Tonantzintla 2. Based on parallax measurements from Gaia DR3, the system is estimated to be 158 light years distant, [1] but is approaching the Solar System with a heliocentric radial velocity of −49 km/s. [6]
The visible component is a red giant with a stellar classification of K0 IIIb. [4] The IIIb luminosity class indicates that it is a lower luminosity giant star. Q Scorpii is a red clump star located on the cool end of the horizontal branch, [3] fusing helium at its core. It has 110% the mass of the Sun but has expanded to 12.4 times its girth. [8] It radiates 62 times the luminosity of the Sun from its photosphere at an effective temperature of 4,605 K, [8] giving it an orange hue. Q Scorpii has an iron abundance half of the Sun's, making it metal deficient. [8] Like most giant stars, it spins slowly, having a projected rotational velocity lower than 1 km/s. [9]
References
- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b Laney, C. D.; Joner, M. D.; Pietrzyński, G. (11 November 2011). "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1637–1641. arXiv: 1109.4800. Bibcode: 2012MNRAS.419.1637L. doi: 10.1111/j.1365-2966.2011.19826.x. ISSN 0035-8711.
- ^ a b Hoffleit, Dorrit; Shapley, Harlow (1937). "Spectroscopic absolute magnitudes of three hundred and seventy southern stars". Annals of Harvard College Observatory. 105 (3): 45–68. Bibcode: 1937AnHar.105...45H.
- ^ a b Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals. 7. Bibcode: 1971ROAn....7.....C.
- ^ a b 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. arXiv: 1606.08053. Bibcode: 2006AstL...32..759G. doi: 10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics. 657: A87. arXiv: 2201.01528. Bibcode: 2022A&A...657A..87O. doi: 10.1051/0004-6361/202040078. eISSN 1432-0746. ISSN 0004-6361.
- ^ a b De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv: 1312.3474. Bibcode: 2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
- ^ 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.
- ^ "Q Scorpii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 18, 2022.
- ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711.
- ^ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue". Astronomy & Astrophysics. 464 (1): 377–392. arXiv: astro-ph/0612449. Bibcode: 2007A&A...464..377F. doi: 10.1051/0004-6361:20065526. eISSN 1432-0746. ISSN 0004-6361.
