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HD 174569
 | The topic of this article may not meet Wikipedia's notability guideline for astronomical objects. (March 2021) |
| 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 + K3III-IV[3] |
| U−B color index | +1.63[2] |
| B−V color index | +1.44[2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −25.61±0.14[4] km/s |
| Proper motion (μ) | RA: +8.168 mas/yr[4] Dec.: +5.959 mas/yr[4] |
| Parallax (π) | 4.4674 ± 0.0200 mas[4] |
| Distance | 730 ± 3 ly (224 ± 1 pc) |
| B | |
| Radial velocity (Rv) | −27[5] km/s |
| Proper motion (μ) | RA: +8.623 mas/yr[1] Dec.: +6.146 mas/yr[1] |
| Parallax (π) | 4.4157 ± 0.0232 mas[6] |
| Distance | 739 ± 4 ly (226 ± 1 pc) |
| Details | |
| A | |
| Radius | 28.33[7] R☉ |
| Luminosity | 204[7] L☉ |
| Temperature | 4,097[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 174569 is a spectroscopic binary[3] star system in the equatorial constellation of Aquila. Based on stellar parallax measurements by Gaia, it is about 730-740 light-years (400 parsecs) away.[4][6]
Both components are giant stars that exhausted their hydrogen supply. Star A has a class K5III, while star B has a class K3III-IV.[3]
- ^ a b c 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 Cite error: The named reference
aaass89_2_415was invoked but never defined (see the help page). - ^ a b c Cite error: The named reference
bidelman1958was invoked but never defined (see the help page). - ^ a b c d 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.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b 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.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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