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.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 16m 26.78744s[1] |
| Declination | +14° 32′ 40.6234″[1] |
| Apparent magnitude (V) | 5.67[2] (5.68 + 9.58)[3] |
| Characteristics | |
| Spectral type | B9.5V[4] + G0IV[3] |
| U−B color index | −0.12[2] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | −19.3[5] km/s |
| Proper motion (μ) | RA: +8.09[1] mas/yr Dec.: +1.03[1] mas/yr |
| Parallax (π) | 7.96 ± 0.60 mas[1] |
| Distance | 410 ± 30 ly (126 ± 9 pc) |
| Orbit[6] | |
| 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 | |
| Rotational velocity (v sin i) | 158[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d e 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.
- ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
- ^ a b c 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
- ^ 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
- ^ 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
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 21 May 2017.
- ^ 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
External links
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