Eta Cancri
Template:Location mark Location of η Cancri (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.34[2] |
| Characteristics | |
| Spectral type | K3 III[2] |
| U−B Template:Engvar | +1.40[2] |
| B−V Template:Engvar | +1.25[2] |
| Astrometry | |
| Radial velocity (Rv) | +22.46[3] km/s |
| Proper motion (μ) | RA: −46.573 mas/yr[1] Dec.: −44.296 mas/yr[1] |
| Parallax (π) | 10.258±0.088 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.44[4] |
| Details | |
| Mass | 1.51[5] Template:Solar mass |
| Radius | 17[6] Template:Solar radius |
| Luminosity | 87[5] Template:Solar luminosity |
| Surface gravity (log g) | 2.1[6] cgs |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | Script error: No such module "val".[4] dex |
| Rotational velocity (v sin i) | 2.7[6] km/s |
| Age | 3.92[5] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Eta Cancri is a single,[8] orange-hued star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinied from η Cancri, and abbreviated Eta Cnc or η Cnc. This is a faint star but visible to the naked eye with an apparent visual magnitude of 5.34.[2] The annual parallax shift of Script error: No such module "val". as seen from Earth yields a distance estimate of Script error: No such module "convert". from the Sun. It is moving further away with a radial velocity of +22 km/s.[3] Due to its proximity to the ecliptic, it is subject to lunar occultations.[9]
A stellar classification of K3 III[2] for Eta Cancri indicates that, at the estimated age of 3.9 billion years old,[5] it has left the main sequence and become an evolved giant star. The spectrum shows unusually strong absorption lines of cyanogen.[2] It has 1.5[5] times the mass of the Sun and has expanded to 17[6] times the Sun's radius. The star is radiating 87[5] times the Sun's luminosity from its photosphere at an effective temperature of around 4,415 K.[5]
In Chinese astronomy, Ghost (Template:Zh) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri.[10] Eta Cancri itself is the second star of Ghost (Template:Zh), following the designation from its determinative star (θ Cnc) from east to west.
References
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- ↑ a b c d Template:Cite Gaia DR3
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- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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