Astronomy:HD 180555

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Short description: Binary star in the constellation Aquila
HD 180555
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
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
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. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  3. ↑ 3.0 3.1 3.2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data.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. ↑ 4.0 4.1 4.2 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E 
  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, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C 
  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 (University of Toronto: International Astronomical Union) 30: p. 57, Bibcode: 1967IAUS...30...57E 
  7. ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 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.
  9. ↑ 9.0 9.1 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, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 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.




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