Astronomy:78 Aquarii
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Short description: Star in the constellation Aquarius
250px Snapshot of 78 Aqr from Digitized Sky Survey project | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 54m 34.12178s[1] |
| Declination | −07° 12′ 16.6490″[1] |
| Apparent magnitude (V) | 6.181[2] |
| Characteristics | |
| Spectral type | K2III[3] |
| Astrometry | |
| Radial velocity (Rv) | 11.63±0.14[1] km/s |
| Proper motion (μ) | RA: −14.811[1] mas/yr Dec.: −34.596[1] mas/yr |
| Parallax (π) | 5.4411 ± 0.0498[1] mas |
| Distance | 599 ± 5 ly (184 ± 2 pc) |
| Details | |
| Radius | 21.775[4] R☉ |
| Luminosity | 203[1] L☉ |
| Surface gravity (log g) | 1.72[5] cgs |
| Temperature | 4,400±30[4] K |
| Metallicity [Fe/H] | −0.01[5] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
78 Aquarii (abbreviated 78 Aqr) is a star in the constellation of Aquarius. 78 Aquarii is its Flamsteed designation. Based on stellar parallax measurements made by Gaia, it is located about 600 light-years (180 parsecs) from the Sun.
78 Aquarii has a spectral type of K2III,[3] indicating a giant star with a reddish color. Its apparent magnitude is 6.18,[2] indicating it is not visible to the sky for all but the best viewing conditions. At its surface, its temperature is estimated to be roughly 4,400 K.[4] It has no known exoplanets.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 4.2 Stassun, K.G. (October 2019). "The revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 5.0 5.1 Matsuno, Tadafumi; Starkenburg, Else; Balbinot, Eduardo; Helmi, Amina (2024). "Improving metallicity estimates for very metal-poor stars in the Gaia DR3 GSP-Spec catalog". Astronomy and Astrophysics 685: A59. doi:10.1051/0004-6361/202245762. Bibcode: 2024A&A...685A..59M.
- ↑ "78 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=78+Aqr.
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