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69 Ceti 
Summary
69 Ceti is a single[7] star located around 860[1] light years away in the equatorial constellation of Cetus. It is visible to the naked eye with an apparent visual magnitude of 5.3.[2] This is an aging red giant star with a stellar classification of M1/2III.[3] It is radiating 1,813 times the Sun's luminosity from an enlarged photosphere, 100 times the Sun's radius, at an effective temperature of 3,765 K.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 21m 56.62838s[1] |
| Declination | +00° 23′ 44.4288″[1] |
| Apparent magnitude (V) | 5.287[2] |
| Characteristics | |
| Spectral type | M1/2III[3] |
| U−B color index | +1.85[4] |
| B−V color index | +1.65[4] |
| Astrometry | |
| Radial velocity (Rv) | +26.99±0.32[1] km/s |
| Proper motion (μ) | RA: −12.393[1] mas/yr Dec.: −8.059[1] mas/yr |
| Parallax (π) | 3.7821 ± 0.2323 mas[1] |
| Distance | 860 ± 50 ly (260 ± 20 pc) |
| Absolute magnitude (MV) | –2.73[5] |
| Details | |
| Radius | 100+10 −18[1] R☉ |
| Luminosity | 1,813±126[1] L☉ |
| Temperature | 3,765+392 −177[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References edit
- ^ a b c d e f g h i j k 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 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ a b Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Ryon, Jenna; Shetrone, Matthew D.; Smith, Graeme H. (2009). "Comparing the CaiiH and K Emission Lines in Red Giant Stars". Publications of the Astronomical Society of the Pacific. 121 (882): 842. arXiv:0907.3346. Bibcode:2009PASP..121..842R. doi:10.1086/605456. S2CID 17821279.
- ^ "69 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 28, 2018.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.