HD 177693
  | |
| Observation data EpochJ2000.0EquinoxJ2000.0(ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h08m52.32474s[1] |
| Declination | −55° 43′ 13.5297″[1] |
| Apparent magnitude(V) | 6.45±0.01[2] |
| Characteristics | |
| Spectral type | K1 III[3]or K1 IV[4] |
| B−Vcolor index | +1.10[5] |
| Astrometry | |
| Radial velocity(Rv) | −20.9±2.9[6]km/s |
| Proper motion(μ) | RA:+56.586mas/yr[1] Dec.:−115.876mas/yr[1] |
| Parallax(π) | 8.6669 ± 0.0269mas[1] |
| Distance | 376 ± 1ly (115.4 ± 0.4pc) |
| Absolute magnitude(MV) | +1.03[7] |
| Details | |
| Mass | 1.25[8]M☉ |
| Radius | 10.6[9]R☉ |
| Luminosity | 50.2+0.4 −0.3[1]L☉ |
| Surface gravity(logg) | 2.52[8]cgs |
| Temperature | 4,750±122[10]K |
| Metallicity[Fe/H] | −0.10[8]dex |
| Rotational velocity(vsini) | <1.3[11]km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 177693(HR 7233; 48 G. Telescopii) is a solitary orange-huedstarlocated in the southernconstellationTelescopium.It has anapparent magnitudeof 6.45,[2]placing it near the limit fornaked eyevisibility, even underideal conditions.Gaia DR3parallaxmeasurements imply a distance of 376light-years,[1]and it is drifting closer with a heliocentricradial velocityof−20.9km/s.[6]At its current distance, HD 177693's brightness is diminished by 0.24magnitudesdue tointerstellar extinction[13]and it has anabsolute magnitudeof +1.03.[7]
HD 177693 has astellar classificationof K1 III,[3]indicating that it is anevolvedorange giant.David Stanley Evansgave a less evolved class of K1 IV,[4]instead indicating that it is a slightly evolvedsubgiant.It has 1.25 times themass of the Sun[8]but it has expanded to 10.6 times theradius of the Sun.[9]It radiates 50.2 times theluminosity of the Sun[1]from its enlargedphotosphereat aneffective temperatureof4,750K.[10]HD 177693 is slightly metal deficient with anironabundance of [Fe/H] = −0.10[8]and it spins with aprojected rotational velocitylower than1.3km/s.[11]
References
[edit]- ^abcdefgVallenari, A.; et al. (Gaia collaboration) (2023)."GaiaData 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.S2CID244398875. Gaia DR3 record for this sourceatVizieR.
- ^abHøg, 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.ISSN0004-6361.S2CID17128864.
- ^abHouk, 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.
- ^abEvans, D. S. (1966). "Fundamental data for Southern stars (6th list)".Royal Greenwich Observatory Bulletins.110:185.Bibcode:1966RGOB..110..185E.
- ^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.
- ^abcGontcharov, 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.eISSN1562-6873.ISSN1063-7737.S2CID119231169.
- ^abAnderson, 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.eISSN1562-6873.ISSN1063-7737.S2CID119257644.
- ^abcdeAnders, F.; et al. (February 2022)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaiaEDR3 stars brighter thanG= 18.5 ".Astronomy & Astrophysics.658:A91.arXiv:2111.01860.Bibcode:2022A&A...658A..91A.doi:10.1051/0004-6361/202142369.eISSN1432-0746.ISSN0004-6361.
- ^abMcDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017)."Fundamental parameters and infrared excesses of Tycho–Gaia stars".Monthly Notices of the Royal Astronomical Society.471(1): 770–791.arXiv:1706.02208.Bibcode:2017MNRAS.471..770M.doi:10.1093/mnras/stx1433.eISSN1365-2966.ISSN0035-8711.S2CID73594365.
- ^abStassun, Keivan G.; et al. (9 September 2019)."The RevisedTESSInput Catalog and Candidate Target List ".The Astronomical Journal.158(4): 138.arXiv:1905.10694.Bibcode:2019AJ....158..138S.doi:10.3847/1538-3881/ab3467.eISSN1538-3881.hdl:1721.1/124721.S2CID166227927.
- ^abDe 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.eISSN1432-0746.ISSN0004-6361.S2CID54046583.
- ^"HD 177693".SIMBAD.Centre de données astronomiques de Strasbourg.RetrievedSeptember 11,2023.
- ^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.eISSN1365-2966.ISSN0035-8711.S2CID118879856.
