Astronomy:64 Ceti
Coordinates: 
02h 11m 21.08s, +08° 34′ 11.31″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | 02h 11m 21.079s[1] |
| Declination | +08° 34′ 11.31″[1] |
| Apparent magnitude (V) | 5.623±0.01[1] |
| Characteristics | |
| Evolutionary stage | Subgiant[1] |
| Spectral type | G0IV[1] |
| Apparent magnitude (B) | 6.189[1] |
| Apparent magnitude (R) | 6.81[1] |
| Apparent magnitude (G) | 5.497[1] |
| Apparent magnitude (J) | 4.763[1] |
| Apparent magnitude (H) | 4.373[1] |
| Apparent magnitude (K) | 4.308[1] |
| B−V color index | 0.52[2] |
| Astrometry | |
| Radial velocity (Rv) | -19.01±0.22[3] km/s |
| Proper motion (μ) | RA: -141.042[3] mas/yr Dec.: -113.463[3] mas/yr |
| Parallax (π) | 23.7901 ± 0.066[3] mas |
| Distance | 136.97 ly (42.016 pc) |
| Absolute magnitude (MV) | 2.49[4] |
| Details[2] | |
| 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.[1] It is located 42.02 parsecs (137.1 light-years) away, based on a parallax measured by Gaia DR3, and it is moving towards Earth at a velocity of 19 km/s.[3] The apparent magnitude of 64 Ceti is 5.62,[1] which makes it visible to the naked eye only in dark skies, far away from light pollution.[4]
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.[1] It has about 1.53 times the Sun's mass and has expanded to 2.53 times the Sun's diameter.[2] It is emitting 8.13 times the solar luminosity from its photosphere at an effective temperature of 6,066 K.[2] 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][2] The B-V index of the star is 0.52, corresponding to a yellow-white hue of a late G/early F star.[2][lower-alpha 5]
It is located in the constellation Cetus, based on its celestial coordinates. Gaia DR3 measured a parallax of 23.8 milliarcseconds for this star, translating into a distance of 42.02 parsecs (137.1 light-years).[3] The apparent magnitude of 64 Ceti is 5.62,[1] which means that it is a faint star, visible to the naked eye only from locations with dark skies.[4] The absolute magnitude, i.e. its brightness if it was seen at a distance of 10 pc (32.6 ly), is 2.49.[4] The star is moving towards Earth at a velocity of 19 km/s.[3] It has a high proper motion across the sky[1] and belongs to the thin disk population, being located 31.03 parsecs (101.2 ly) above the galactic plane.[2]
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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 "64 Ceti". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=64+Ceti.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. https://ui.adsabs.harvard.edu/abs/2018A&A...615A..31D. Data about this star is available here at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 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.
- ↑ 4.0 4.1 4.2 4.3 "64 Ceti - Star in Cetus | TheSkyLive.com". https://theskylive.com/sky/stars/64-ceti-star.
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