78 Aquarii
Snapshot of 78 Aqr from Digitized Sky Survey project | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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 | |
| BD−07°5886, HD 216637, HIP 113127, HR 8710, SAO 146382[6] | |
| 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
- ^ a b c d e f g 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 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.
- ^ a b 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 c Stassun, K.G.; et al. (October 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. S2CID 166227927.
- ^ a b 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. arXiv:2212.11639. Bibcode:2024A&A...685A..59M. doi:10.1051/0004-6361/202245762.
- ^ "78 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-22.