Subgiant in the constellation Cetus
64 Ceti
Observation data
Epoch J2000 Equinox J2000
|
| 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 mas/yr[3]
Dec.: -113.463 mas/yr[3] |
| Parallax (π) | 23.7901 ± 0.066 mas[3] |
| Distance | 136.97 ly
(42.016 pc)[3] |
| Absolute magnitude (MV) | 2.49[4] |
|
|---|
| Details[2] |
|---|
|
|---|
| Mass | 1.53±0.04 M☉ |
| Radius | 2.56±0.56 R☉ |
| Luminosity | 8.13[a] 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[b] |
| Rotational velocity (v sin i) | 8.96±1.52 km/s |
| Age | 2.63[c] Gyr |
|
|---|
| Other designations |
|---|
64 Ceti, Gaia DR2 2521857809546128896, Gaia DR3 2521857809546128896, HD 13421, HIP 10212, HR 635, SAO 110390, PPM 145360, LSPM J0211+0834, TIC 337046898, GSC 00630-01238, IRAS 02087+0820, WISE J021120.97+083410.1 |
| 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,[d] and it rotates under its axis at a speed of 8.96 km/s, translating into a rotation period of 15 days.[b][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][e]
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
- ^ a b 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
