HD 180555
| 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] | |
Argument of periastron (ω)(secondary) | 262.7 ± 28.7° | |
| Details | ||
| HD 180555 A | ||
Rotational velocity (v sin i) | 158[7] km/s | |
| 104668. | ||
| Database references | ||
| SIMBAD | data | |
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]
References
- ^ S2CID 18759600.
- ^ Bibcode:1986EgUBV........0M
- ^ S2CID 14878976
- doi:10.1086/110819
- 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.
- S2CID 18475298
External links
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