HD 185075

HD 185075, also known as HR 7459 or rarely 65 G. Telescopii, is a solitary star located in the southern constellation Telescopium. It has an apparent magnitude of 6.26,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 422 light years[1] and it is currently receding with a heliocentric radial velocity of 14.8 km/s.[4] At its current distance, HD 185075's brightness is diminished by 0.23 magnitudes due to interstellar dust[11] and it has an absolute magnitude of +0.92.[5]

HD 185075
Location of HD 185075 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 40m 18.71944s[1]
Declination −54° 25′ 04.0417″[1]
Apparent magnitude (V) 6.26[2]
Characteristics
Spectral type K0 III[3]
B−V color index +1.00[2]
Astrometry
Radial velocity (Rv)14.8±0.4[4] km/s
Proper motion (μ) RA: +76.081 mas/yr[1]
Dec.: −11.563 mas/yr[1]
Parallax (π)7.7297 ± 0.0224 mas[1]
Distance422 ± 1 ly
(129.4 ± 0.4 pc)
Absolute magnitude (MV)+0.92[5]
Details
Mass1.34±0.06[6] M☉
Radius12.6±0.6[7] R☉
Luminosity79.8+0.2
−0.1[1] L☉
Surface gravity (log g)2.63±0.11[6] cgs
Temperature4,785±25[6] K
Metallicity [Fe/H]−0.42±0.02[6] dex
Rotational velocity (v sin i)<1[8] km/s
Age414[1] Myr
Other designations
65 G. Telescopii[9], CD−54°8939, CPD−54°9438, GC 27177, HD 185075, HIP 96781, HR 7459, SAO 246204[10]
Database references
SIMBADdata

This is an evolved red giant with a stellar classification of K0 III.[3] It has 1.34 times the mass of the Sun[6] but it has expanded to 12.6 times the Sun's radius.[7] It radiates 79.8 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,785 K,[6] giving it an orange hue. HD 185075 is particularly metal deficient with an iron abundance 38% that of the Sun's[6] ([Fe/H] = −0.42) and it spins too slowly for its projected rotational velocity to be measured accurately.[8]

References
  1. 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.
  2. Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J. S2CID 118307502.
  3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
  4. 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.
  5. 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.
  6. 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.
  7. Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  8. 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 V: Southern 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. S2CID 54046583.
  9. 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.
  10. "HD 185075". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved March 30, 2023.
  11. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
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