Astronomy:64 Ceti
Coordinates: 
02h 11m 21.08s, +08° 34′ 11.31″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 02h 11m 21.079s[2] |
| Declination | +08° 34′ 11.31″[2] |
| Apparent magnitude (V) | 5.623±0.01[3] |
| Characteristics | |
| Evolutionary stage | Subgiant[2] |
| Spectral type | G0IV[4] |
| Apparent magnitude (B) | 6.189[3] |
| Apparent magnitude (R) | 6.81[5] |
| Apparent magnitude (G) | 5.497[2] |
| Apparent magnitude (J) | 4.763[6] |
| Apparent magnitude (H) | 4.373[6] |
| Apparent magnitude (K) | 4.308[6] |
| B−V color index | 0.57[1] |
| Astrometry | |
| Radial velocity (Rv) | −19.01±0.22[2] km/s |
| Proper motion (μ) | RA: −141.042[2] mas/yr Dec.: −113.463[2] mas/yr |
| Parallax (π) | 23.7901 ± 0.066[2] mas |
| Distance | 137.1 ± 0.4 ly (42.0 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.59[1] |
| Details[7] | |
| Mass | 1.53±0.04 M☉ |
| Radius | 2.56±0.56 R☉ |
| Luminosity | 8.13[lower-alpha 1] L☉ |
| Surface gravity (log g) | 3.81±0.09 cgs |
| Temperature | 6066±42 K |
| Metallicity [Fe/H] | 0.14±0.04 dex |
| Rotation | 15 days[lower-alpha 2] |
| Rotational velocity (v sin i) | 8.96±1.52 km/s |
| Age | 2.63[lower-alpha 3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
64 Ceti is a star located located in the constellation Cetus. Based on its spectral type of G0IV, it is a G-type star that has left the main sequence and evolved into a subgiant. It is located 42 parsecs (137 light-years) away and it is moving towards Earth at a velocity of 19 km/s.[2] The apparent magnitude of 64 Ceti is 5.62, which makes it visible to the naked eye only in dark skies, far away from light pollution.[9]
Characteristics
64 Ceti is a G-type star that has left the main sequence and now evolved into a subgiant, based on its spectral type of G0IV and evolutionary models. It has about 1.53 times the Sun's mass and has expanded to 2.53 times the Sun's diameter.[7] It is emitting 8.13 times the solar luminosity from its photosphere at an effective temperature of 6,066 K.[7] The age of 64 Ceti is estimated at 2.63 billion years, about 58% of the Solar System's age,[lower-alpha 4] and it rotates under its axis at a speed of 8.96 km/s, translating into a rotation period of 15 days.[lower-alpha 2][7] The B-V index of the star is 0.57, corresponding to a yellow-white hue of a late G/early F star.[7][lower-alpha 5]
It is located in the constellation Cetus, based on its celestial coordinates. Gaia DR3 measured a parallax of 23.8 mas for this star, translating into a distance of 42.02 parsecs (137.1 light-years). The absolute magnitude, i.e. its brightness if it was seen at a distance of 10 pc (32.6 ly), is 2.59.[1] It has a high proper motion across the sky and belongs to the thin disk population, being located 31.03 parsecs (101.2 ly) above the galactic plane.[7]
Notes
- ↑ from a logarithm of 0.91
- ↑ 2.0 2.1 The rotational period is calculated using the star's circumference (π*diameter (km)) and later divided by the rotational period. The value will be divided by 86400 to convert from seconds to days.
- ↑ From a logarithm of 9.42.
- ↑ The Solar System has an age of 4.532 billion years.
- ↑ See the Color index article
References
- ↑ 1.0 1.1 1.2 1.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
- ↑ 3.0 3.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H.
- ↑ Cowley, A. P.; Bidelman, W. P. (1979). "MK spectral types for some F and G stars". Publications of the Astronomical Society of the Pacific 91: 83. doi:10.1086/130446. Bibcode: 1979PASP...91...83C.
- ↑ Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "VizieR Online Data Catalog: UCAC4 Catalogue (Zacharias+, 2012)". Vizier Online Data Catalog. Bibcode: 2012yCat.1322....0Z.
- ↑ 6.0 6.1 6.2 Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". Vizier Online Data Catalog. Bibcode: 2003yCat.2246....0C.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Deka-Szymankiewicz, B.; Niedzielski, A.; Adamczyk, M.; Adamów, M.; Nowak, G.; Wolszczan, A. (2018-07-01). "The Penn State - Toruń Centre for Astronomy Planet Search stars. IV. Dwarfs and the complete sample". Astronomy and Astrophysics 615: A31. doi:10.1051/0004-6361/201731696. ISSN 0004-6361. Bibcode: 2018A&A...615A..31D. Data about this star is available here at VizieR.
- ↑ "64 Ceti". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=64+Ceti.
- ↑ "64 Ceti - Star in Cetus | TheSkyLive.com". https://theskylive.com/sky/stars/64-ceti-star.
 |  |
