69 Ceti

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]

69 Ceti

Observation data Epoch J2000      Equinox J2000
Constellation	Cetus
Right ascension	02^h 21^m 56.62838^s[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[1] mas
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
69 Cet, BD−00°355, HD 14652, HIP 11021, HR 689, SAO 110495[6]
Database references
SIMBAD	data

References

1. 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.
2. 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.
3. Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
4. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
5. 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.
6. "69 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 28, 2018.
7. 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.