Astronomy:HD 185075
  | |
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: −11.563[1] mas/yr |
| Parallax (π) | 7.7297 ± 0.0224[1] mas |
| Distance | 422 ± 1 ly (129.4 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.92[5] |
| Details | |
| Mass | 1.34±0.06[6] M☉ |
| Radius | 12.6±0.6[7] R☉ |
| Luminosity | 79.8+0.2−0.1[1] L☉ |
| Surface gravity (log g) | 2.63±0.11[6] cgs |
| Temperature | 4,785±25[6] K |
| Metallicity [Fe/H] | −0.42±0.02[6] dex |
| Rotational velocity (v sin i) | <1[8] km/s |
| Age | 414[1] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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[10] and it has an absolute magnitude of +0.92.[5]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 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 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.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. 1. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (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. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O.
- ↑ 7.0 7.1 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. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K.
- ↑ 8.0 8.1 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. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
- ↑ "HD 185075". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+185075.
- ↑ 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. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G.
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