Astronomy:HD 145250

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Short description: Star in the constellation Scorpius
HD 145250
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas/yr
Dec.: −87.568[2] mas/yr
Parallax (π)11.5124 ± 0.0934[2] mas
Distance283 ± 2 ly
(86.9 ± 0.7 pc)
Absolute magnitude (MV)+0.15[5]
Details
Mass1.38±0.09[1] M☉
Radius16.5±2.7[1] R☉
Luminosity86.2±2.1[1] L☉
Surface gravity (log g)2.74±0.10[6] cgs
Temperature4,540±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
SIMBADdata

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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. doi:10.3847/2515-5172/ade1cd. ISSN 2515-5172. Bibcode: 2025arXiv250520542M. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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.
  3. ↑ 3.0 3.1 3.2 Mermilliod, J.-C. (1987). "UBV Photoelectric Photometry Catalogue (1986): I. The Original data" (in en). Astronomy and Astrophysics Supplement Series 71: 413. ISSN 0365-0138. Bibcode: 1987A&AS...71..413M.  HD 145250's database entry at VizieR.
  4. ↑ 4.0 4.1 Houk, N. (1982) (in en). 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.
  5. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  6. ↑ 6.0 6.1 6.2 6.3 Soubiran, C. et al. (July 1, 2022). "Assessment of [Fe/H] determinations for FGK stars in spectroscopic surveys". Astronomy and Astrophysics 663: A4. doi:10.1051/0004-6361/202142409. ISSN 0004-6361. Bibcode: 2022A&A...663A...4S.  HD 145250's database entry at VizieR.
  7. ↑ "HD 145250". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+145250. 
  8. ↑ Miret-Roig, Núria; Bouy, Hervé; Raymond, Sean N.; Tamura, Motohide; Bertin, Emmanuel; Barrado, David; Olivares, Javier; Galli, Phillip A. B. et al. (February 2022). "A rich population of free-floating planets in the Upper Scorpius young stellar association" (in en). Nature Astronomy 6: 89–97. doi:10.1038/s41550-021-01513-x. ISSN 2397-3366. Bibcode: 2022NatAs...6...89M.  HD 145250's database entry at VizieR.
  9. ↑ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16. 
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems" (in en). Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E.  HD 145250's database entry at VizieR.
  11. ↑ 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" (in en). Astronomy and Astrophysics 623: A72. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Bibcode: 2019A&A...623A..72K.  HD 145250's database entry at VizieR.

Coordinates: Sky map 16h 11m 02.1s, −29° 24′ 58″



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