8 Aquarii (abbreviated 8 Aqr) is a blue-white sub-giant of the spectral class A4IV in the constellation Aquarius. 8 Aquarii is the Flamsteed designation. It is approximately 298 light-years away from Earth, based on parallax.[1] It is approximately 1.7 solar masses and about 3 times hotter than the Sun and thus allows lines of ionized metals with an abundance of metals.[citation needed]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 20h 59m 54.826s[1] |
| Declination | −13° 03′ 05.87″[1] |
| Apparent magnitude (V) | 6.60[2] |
| Characteristics | |
| Spectral type | A3/4 IV[3] |
| B−V color index | 0.177±0.007[4] |
| Astrometry | |
| Proper motion (μ) | RA: −31.787 mas/yr[1] Dec.: −6.566 mas/yr[1] |
| Parallax (π) | 10.9478 ± 0.1472 mas[1] |
| Distance | 298 ± 4 ly (91 ± 1 pc) |
| Absolute magnitude (MV) | 1.91[4] |
| Details | |
| Mass | 1.9[5] M☉ |
| Radius | 2.27[5] R☉ |
| Luminosity | 19[5] L☉ |
| Surface gravity (log g) | 4.06[6] cgs |
| Temperature | 8,008[5] K |
| Metallicity [Fe/H] | 0.11[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
- ^ Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c d Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ a b Anders, F.; et al. (2022). "VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)". Vizier Online Data Catalog. Bibcode:2022yCat.1354....0A.
- ^ "* 8 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg.
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