# HD 175535

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Star in the constellation Draco

HD 175535 Location of HD 175535 (circled in red) Observation data Epoch J2000 Equinox J2000 Constellation Draco[1] Right ascension 18h 53m 13.55099s[2] Declination +50° 42′ 29.5940″[2] Apparent magnitude (V) 4.92[3] Characteristics Evolutionary stage red giant branch[2] Spectral type G7 IIIa Fe−1[4] U−B color index 0.57[5] B−V color index 0.90[3] Astrometry Radial velocity (Rv) +8.5[3] km/s Proper motion (μ) RA: −4.442[2] mas/yr Dec.: −21.985[2] mas/yr Parallax (π) 11.1969±0.4974 mas[2] Distance 290 ± 10 ly (89 ± 4 pc) Absolute magnitude (MV) −0.78[1] Orbit[5] Period (P) 972.84±0.35 d Eccentricity (e) 0.342±0.006 Periastron epoch (T) 53,678.2±2.4 Argument of periastron (ω) (secondary) 190.0±1.1° Semi-amplitude (K1) (primary) 5.83±0.04 km/s Details Mass 3.27[3] M☉ Radius 13[6] R☉ Luminosity 219[3] L☉ Surface gravity (log g) 2.85±0.15[7] cgs Temperature 5,024±74[3] K Metallicity [Fe/H] −0.07±0.07[7] dex Rotational velocity (v sin i) 2.3[8] km/s Age 320[3] Myr Other designations BD+50°2686, HD 175535, HIP 92689, HR 7137, SAO 31241[9] Database references SIMBAD data

**HD 175535** is a [binary star](/source/Binary_star) system in the northern [circumpolar constellation](/source/Circumpolar_constellation) of [Draco](/source/Draco_(constellation)). It has an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.92,[3] which is bright enough to be faintly visible to the naked eye. The system is located about 290 [light years](/source/Light_year) away, as determined from its annual [parallax shift](/source/Stellar_parallax) of 11.2 [mas](/source/Milliarcsecond).[2] It is moving further from the Earth with a heliocentric [radial velocity](/source/Radial_velocity) of +8.5 km/s.[3]

The binary nature of this system was announced by [W. W. Campbell](/source/W._W._Campbell) of the [Lick Observatory](/source/Lick_Observatory) in 1911. It is a single-lined [spectroscopic binary](/source/Spectroscopic_binary) with an [orbital period](/source/Orbital_period) of 2.66 years (972.84 d) and an [eccentricity](/source/Orbital_eccentricity) of 0.342. The *a* sin *i* value for the visible component is 73.4±0.6 [Gm](/source/Gigametre), where *a* is the [semimajor axis](/source/Semimajor_axis) and *i* is the (unknown) [orbital inclination](/source/Orbital_inclination).[5] This indicates that the actual semimajor axis is larger than 0.49 [AU](/source/Astronomical_unit).[10]

The visible component appears to be an [evolved](/source/Stellar_evolution) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of G7 IIIa Fe−1,[4] where the suffix notation indicates an underabundance of iron in the [atmosphere](/source/Stellar_atmosphere). It is 320[3] million years old with 3.27[3] times the [mass of the Sun](/source/Mass_of_the_Sun) and about 13[6] times the [Sun's radius](/source/Sun's_radius). The star is radiating 219[3] times the [Sun's luminosity](/source/Sun's_luminosity) from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 5,024 K.[3]

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=92689&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-GaiaDR3_2-0) [***b***](#cite_ref-GaiaDR3_2-1) [***c***](#cite_ref-GaiaDR3_2-2) [***d***](#cite_ref-GaiaDR3_2-3) [***e***](#cite_ref-GaiaDR3_2-4) [***f***](#cite_ref-GaiaDR3_2-5) [***g***](#cite_ref-GaiaDR3_2-6) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D2144423264761182848%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-Luck2015_3-0) [***b***](#cite_ref-Luck2015_3-1) [***c***](#cite_ref-Luck2015_3-2) [***d***](#cite_ref-Luck2015_3-3) [***e***](#cite_ref-Luck2015_3-4) [***f***](#cite_ref-Luck2015_3-5) [***g***](#cite_ref-Luck2015_3-6) [***h***](#cite_ref-Luck2015_3-7) [***i***](#cite_ref-Luck2015_3-8) [***j***](#cite_ref-Luck2015_3-9) [***k***](#cite_ref-Luck2015_3-10) [***l***](#cite_ref-Luck2015_3-11) [***m***](#cite_ref-Luck2015_3-12) Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", *Astronomical Journal*, **150** (3), 88, [arXiv](/source/ArXiv_(identifier)):[1507.01466](https://arxiv.org/abs/1507.01466), [Bibcode](/source/Bibcode_(identifier)):[2015AJ....150...88L](https://ui.adsabs.harvard.edu/abs/2015AJ....150...88L), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/150/3/88](https://doi.org/10.1088%2F0004-6256%2F150%2F3%2F88), [S2CID](/source/S2CID_(identifier)) [118505114](https://api.semanticscholar.org/CorpusID:118505114).

1. ^ [***a***](#cite_ref-perkins1989_4-0) [***b***](#cite_ref-perkins1989_4-1) Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", *Astrophysical Journal Supplement Series*, **71**: 245, [Bibcode](/source/Bibcode_(identifier)):[1989ApJS...71..245K](https://ui.adsabs.harvard.edu/abs/1989ApJS...71..245K), [doi](/source/Doi_(identifier)):[10.1086/191373](https://doi.org/10.1086%2F191373)

1. ^ [***a***](#cite_ref-Griffin2010_5-0) [***b***](#cite_ref-Griffin2010_5-1) [***c***](#cite_ref-Griffin2010_5-2) Griffin, R. F. (October 2010), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 214: HR 6790, HR 6886, HR 6901, and HR 7137", *The Observatory*, **130**: 299–314, [Bibcode](/source/Bibcode_(identifier)):[2010Obs...130..299G](https://ui.adsabs.harvard.edu/abs/2010Obs...130..299G).

1. ^ [***a***](#cite_ref-Cadars2001_6-0) [***b***](#cite_ref-Cadars2001_6-1) Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition", *Astronomy and Astrophysics*, **367** (2): 521–524, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0012289](https://arxiv.org/abs/astro-ph/0012289), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...367..521P](https://ui.adsabs.harvard.edu/abs/2001A&A...367..521P), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20000451](https://doi.org/10.1051%2F0004-6361%3A20000451), [S2CID](/source/S2CID_(identifier)) [425754](https://api.semanticscholar.org/CorpusID:425754).

1. ^ [***a***](#cite_ref-prugniel2011_7-0) [***b***](#cite_ref-prugniel2011_7-1) Prugniel, P.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", *Astronomy & Astrophysics*, **531**: A165, [arXiv](/source/ArXiv_(identifier)):[1104.4952](https://arxiv.org/abs/1104.4952), [Bibcode](/source/Bibcode_(identifier)):[2011A&A...531A.165P](https://ui.adsabs.harvard.edu/abs/2011A&A...531A.165P), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201116769](https://doi.org/10.1051%2F0004-6361%2F201116769), [S2CID](/source/S2CID_(identifier)) [54940439](https://api.semanticscholar.org/CorpusID:54940439).

1. **[^](#cite_ref-DeMedeiros2002_8-0)** De Medeiros, J. R.; et al. (October 2002), "The Rotation of Binary Systems with Evolved Components", *The Astrophysical Journal*, **578** (2): 943–950, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0207288](https://arxiv.org/abs/astro-ph/0207288), [Bibcode](/source/Bibcode_(identifier)):[2002ApJ...578..943D](https://ui.adsabs.harvard.edu/abs/2002ApJ...578..943D), [doi](/source/Doi_(identifier)):[10.1086/342613](https://doi.org/10.1086%2F342613), [S2CID](/source/S2CID_(identifier)) [16196039](https://api.semanticscholar.org/CorpusID:16196039).

1. **[^](#cite_ref-SIMBAD_9-0)** ["HD 175535"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+175535). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-07-19.

1. **[^](#cite_ref-10)** The maximum value of the [sine](/source/Sine) function is 1.0; hence, 'a' is no smaller than the value cited.

v t e Constellation of Draco List of stars in Draco Draco in Chinese astronomy Stars Bayer α (Thuban) β (Rastaban) γ (Eltanin) δ (Altais) ε (Tyl) ζ (Aldhibah) η (Athebyne) θ ι (Edasich) κ λ (Giausar) μ (Alrakis) ν (Kuma) ξ (Grumium) ο π ρ σ (Alsafi) τ υ φ χ ψ1 (Dziban) ψ2 ω Flamsteed 4 6 7 (Tianyi) 8 (Taiyi) 10 (i) 15 (A) 18 (g) 19 (h) 26 36 39 (b) 42 (Fafnir) 45 (d) 50 59 64 (e) 68 Variable TW YY AG BY CL CM CX DO EK HP V581 HR 3751 4126 4934 5811 6237 6518 6618 (Alruba) 6817 7137 7783 HD 109246 (Funi) 101364 128717 147379 156279 158259 176693 191939 Other 2MASS 1237+6526 2MASS J17554042+6551277 G 240-72 GD 356 Gliese 420 Gliese 625 Gliese 687 GRW +70 8247 Kepler-4 Kepler-10 Kepler-12 Kepler-90 Kepler-296 KOI-256 LP 71-82 Qatar-1 SDSS J1240+6710 Struve 2398 TOI-1136 WD 1856+534 WISE 1647+5632 WISE 1841+7000 Exoplanets HD 139357 b HD 167042 b ι Dra b (Hypatia) Kepler-4b Kepler-10b c Kepler-12b Kepler-90e f g h i Kepler-296b c d e f TOI-1452 b TrES-2b Star clusters LAMOST 1 Nebulae Cat's Eye Nebula NGC 6742 Galaxies NGC 3147 3197 3735 4121 4125 4221 4236 4319 4331 4332 4363 4441 4513 4545 4589 5678 5777 5866 5866B 5879 5905 5907 5949 5963 5965 5982 5985 6090 6248 6285 6286 6338 6340 6365 6373 6394 6412 6503 6505 6566 6621 6622 6670 6676 6786 6789 Other 1ES 1927+654 1ES 1959+650 3C 249.1 3C 305 3C 319 3C 343 3C 343.1 3C 351 3C 356 3C 371 3C 380 3C 390.3 3C 401 4C +72.26 4C 73.08 8C 1241+735 Abell 2218 BCG Bean galaxy Beaver galaxy BZQ J1727+5510 Draco Dwarf Draco II GB 1508+5714 Goldfish galaxy H1821+643 HFLS3 IERS B1946+708 IRAS F17179+5444 IRAS 18580+6527 J120011.1+680924.8 KKR 25 Markarian 817 Markarian 876 Original TRG PGC 39058 Porphyrion QSO B1823+568 RGZ J172749.5+534647 S5 1803+784 S5 2007+777 SDSS J1715+6008 Tadpole Galaxy UGC 9391 UGC 9405 UGC 11241 UGC 11411 WISEA J145223.62+611707.5 WN B1851+5707 Galaxy clusters Abell 2218 CL1358+62 Draco Supercluster NGC 5866 Group Astronomical events SN 2003jb SN 2005B SN 2016aps Swift J1644+57 Category

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Adapted from the Wikipedia article [HD 175535](https://en.wikipedia.org/wiki/HD_175535) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/HD_175535?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.