HD 145250
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius[1] |
| Right ascension | 16h 11m 02.06830s[2] |
| Declination | −29° 24′ 58.3873″[2] |
| Apparent magnitude (V) | 5.13[3] |
| Characteristics | |
| Evolutionary stage | Red-giant branch[1] |
| Spectral type | K0 III[4] |
| U−B color index | 1.02[3] |
| B−V color index | 1.12[3] |
| Astrometry | |
| Radial velocity (Rv) | −26.46±0.12[2] km/s |
| Proper motion (μ) | RA: −88.148 mas/yr[2] Dec.: −87.568 mas/yr[2] |
| Parallax (π) | 11.5124±0.0934 mas[2] |
| Distance | 283 ± 2 ly (86.9 ± 0.7 pc) |
| Absolute magnitude (MV) | +0.15[5] |
| Details | |
| Mass | 1.38±0.09[1] M☉ |
| Radius | 16.5±2.7[1] R☉ |
| Luminosity | 86.2±2.1[1] L☉ |
| Surface gravity (log g) | 2.74±0.10[6] cgs |
| Temperature | 4,540±50[6] K |
| Metallicity [Fe/H] | −0.36±0.05[6] dex |
| Other designations | |
| CD−29°12343, HD 145250, HIP 79302, HR 6017, TYC 6792-2274-1[7] | |
| Database references | |
| SIMBAD | data |
HD 145250 is a star in the constellation of Scorpius. At an apparent magnitude of +5.13, it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give a distance of 283 light-years. The star is inside the Upper Scorpius subgroup of the Scorpius–Centaurus association,[1] but is not a member.[8]
The spectrum of this star matches a spectral class of K0 III,[4] with the luminosity class III indicating it is a giant star that has exhausted the hydrogen at its core. It is currently fusing hydrogen in a shell around the core, being in the evolutionary stage known as the red-giant branch. HD 145250 displays photometric variability caused by seismic oscillations, and has been studied using asteroseismology to determine its physical properties. The star has a mass 1.38 times the mass of the Sun and has expanded to 16 times the Sun's radius. It now radiates 86 times the Sun's luminosity from its photosphere[1] at an effective temperature of 4,540 K.[6] This temperature give it the orangish hue typical of a K-type star.[9]
While no companion star has been detected,[10] its proper motions derived by the Hipparcos and Gaia satellites are slightly different, suggesting it may be an astrometric binary with a low-mass companion.[11][1]
References
[edit]- ^ a b c d e f g h Molnár, László; Lelkes, Klára (2025-06-10). "Asteroseismic Mass and Radius of the Naked-eye Red Giant HD 145250". Research Notes of the AAS. 9 (6): 137. arXiv:2505.20542. Bibcode:2025arXiv250520542M. doi:10.3847/2515-5172/ade1cd. ISSN 2515-5172.
- ^ 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 c Mermilliod, J.-C. (1987). "UBV Photoelectric Photometry Catalogue (1986): I. The Original data". Astronomy and Astrophysics Supplement Series. 71: 413. Bibcode:1987A&AS...71..413M. ISSN 0365-0138. HD 145250's database entry at VizieR.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. Bibcode:1982mcts.book.....H. HD 145250's database entry at VizieR.
- ^ 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. XHIP record for this object at VizieR.
- ^ a b c d Soubiran, C.; et al. (July 1, 2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy and Astrophysics. 663: A4. arXiv:2112.07545. Bibcode:2022A&A...663A...4S. doi:10.1051/0004-6361/202142409. ISSN 0004-6361. HD 145250's database entry at VizieR.
- ^ "HD 145250". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 June 2025.
- ^ Miret-Roig, Núria; Bouy, Hervé; Raymond, Sean N.; Tamura, Motohide; Bertin, Emmanuel; Barrado, David; Olivares, Javier; Galli, Phillip A. B.; Cuillandre, Jean-Charles; Sarro, Luis Manuel; Berihuete, Angel; Huélamo, Nuria (February 2022). "A rich population of free-floating planets in the Upper Scorpius young stellar association". Nature Astronomy. 6: 89–97. arXiv:2112.11999. Bibcode:2022NatAs...6...89M. doi:10.1038/s41550-021-01513-x. ISSN 2397-3366. HD 145250's database entry at VizieR.
- ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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. ISSN 0035-8711. HD 145250's database entry at VizieR.
- ^ 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: A72. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. HD 145250's database entry at VizieR.
