HD 180555

HD 180555
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila[1]
Right ascension 19h 16m 26.78744s[2]
Declination +14° 32′ 40.6234″[2]
Apparent magnitude (V) 5.67[3] (5.68 + 9.58)‍[4]
Characteristics
Spectral type B9.5V[5] + G0IV[4]
U−B color index −0.12[3]
B−V color index −0.03[3]
Astrometry
Radial velocity (Rv)−19.3[6] km/s
Proper motion (μ) RA: +8.09[2] mas/yr
Dec.: +1.03[2] mas/yr
Parallax (π)7.96±0.60 mas[2]
Distance410 ± 30 ly
(126 ± 9 pc)
Absolute magnitude (MV)+0.17[1]
Orbit[7]
Period (P)13.673±0.069 yr
Semi-major axis (a)0.0583±0.0014″
Eccentricity (e)0.022±0.010
Inclination (i)131.3±3.7°
Longitude of the node (Ω)242.3±4.5°
Periastron epoch (T)B 2008.572±1.101
Argument of periastron (ω)
(secondary)		262.7±28.7°
Details
HD 180555 A
Mass2.8[8] M☉
Radius4.1[8] R☉
Luminosity89[8] L☉
Temperature10,107[8] K
Metallicity [Fe/H]−0.27[8] dex
Rotational velocity (v sin i)158[9] km/s
Age339[8] Myr
HD 180555 B
Mass1.1[10] M☉
Radius1.7[10] R☉
Luminosity3.2[10] L☉
Temperature5,935[10] K
Metallicity [Fe/H]−0.24[10] dex
Rotational velocity (v sin i)158[9] km/s
Age6.3[10] Gyr
Other designations
BD+14°3852, HD 180555, HIP 94720, HR 7307, SAO 104668
Database references
SIMBADdata

HD 180555 is a binary star in the equatorial constellation of Aquila. It consists of a two stars, orbiting with an orbital period of 8.95 years and an eccentricity of 0.43. A third component lies at an angular separation of 8.32″, but it is unrelated to the system.[4]

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  2. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  3. 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  4. 1 2 3 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976
  5. ↑ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  6. ↑ Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), "The Revision of the General Catalogue of Radial Velocities", Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode:1967IAUS...30...57E
  7. ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 21 May 2017.
  8. 1 2 3 4 5 6 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.
  9. 1 2 Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298
  10. 1 2 3 4 5 6 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.


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