| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22 01 05.01544 |
| Declination | +00° 36′ 16.9787″ |
| Apparent magnitude (V) | 5.597 |
| Characteristics | |
| Spectral type | K2III |
| U−B color index | +1.40 |
| B−V color index | +1.28 |
| Astrometry | |
| Radial velocity (Rv) | +8.12±0.1 km/s |
| Proper motion (μ) | RA: +6.22 mas/yr Dec.: −11.05 mas/yr |
| Parallax (π) | 5.7956 ± 0.1557 mas |
| Distance | 560 ± 20 ly (173 ± 5 pc) |
| Details | |
| Mass | 1.47 M☉ |
| Radius | 28.15+0.61 −0.93 R☉ |
| Luminosity | 258±8 L☉ |
| Surface gravity (log g) | 2.3 cgs |
| Temperature | 4,361 K |
| Age | 2.9 Gyr |
| Other designations | |
| 28 Aqr, BD−00° 4296, HD 209128, HIP 108691, HR 8390, SAO 127235 | |
| Database references | |
| SIMBAD | data |
28 Aquarii is a single star located about 560 light years away from the Sun in the zodiac constellation of Aquarius. 28 Aquarii is the Flamsteed designation. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.6. This object is moving further from the Earth with a heliocentric radial velocity of +8.1 km/s.
This 2.9 billion year old object is an aging giant star with a stellar classification of K2 III. After exhausting the hydrogen at its core, this star evolved off the main sequence and has now expanded to 28 times the Sun's radius. It has 1.47 times the mass of the Sun and is radiating 258 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,361 K.
References
- ^ 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.
- ^ 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". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S. (2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
- ^ van Leeuwen, F.; et al. (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.
- ^ Martig, Marie; Fouesneau, Morgan; Rix, Hans-Walter; Ness, Melissa; Mészáros, Szabolcs; García-Hernández, D. A.; Pinsonneault, Marc; Serenelli, Aldo; Aguirre, Victor Silva; Zamora, Olga (2016). "Red giant masses and ages derived from carbon and nitrogen abundances". Monthly Notices of the Royal Astronomical Society. 456 (4): 3655. arXiv:1511.08203. Bibcode:2016MNRAS.456.3655M. doi:10.1093/mnras/stv2830.
- ^ "* 28 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 January 2018.
- Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
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