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HD 174569 is a spectroscopic binary[3] star system in the equatorial constellation of Aquila. Based on stellar parallax measurements by Hipparcos, it is about 1,300 light-years (400 parsecs) away.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 18h 50m 45.5515s[1] |
| Declination | +10° 58′ 34.9970″[1] |
| Apparent magnitude (V) | 6.36[2] |
| Characteristics | |
| Spectral type | K5III[3] |
| U−B color index | +1.63[2] |
| B−V color index | +1.44[2] |
| Astrometry | |
| Radial velocity (Rv) | −23.7 km/s |
| Proper motion ( | RA: +7.92[1] mas/yr Dec.: +4.66[1] mas/yr |
| Parallax ( | 2.59 ± 0.84 mas[1] |
| Distance | approx. 1,300 ly (approx. 400 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d e f 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 Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series, 89 (2): 415–419, Bibcode:1991A&AS...89..415O
- ^ a b Bidelman, William P. (April 1958), "Spectral Classification of Visual Binaries Having Primaries Above the Main Sequence", Publications of the Astronomical Society of the Pacific, 70 (413): 168, Bibcode:1958PASP...70..168B, doi:10.1086/127203
External links
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