Theta Cancri
Template:Location mark Location of θ Cancri (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | +5.323[3] |
| Characteristics | |
| Spectral type | K5 III[4] |
| U−B Template:Engvar | +1.949[3] |
| B−V Template:Engvar | +1.565[3] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: −59.639 mas/yr[2] Dec.: −56.615 mas/yr[2] |
| Parallax (π) | 7.5577±0.1008 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.19[1] |
| Details | |
| Radius | Script error: No such module "val".[6] Template:Solar radius |
| Luminosity | Script error: No such module "val".[6] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[2] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Theta Cancri, is a multiple star[8][4] system in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinised from θ Cancri, and abbreviated Theta Cnc or θ Cnc. This star is visible to the naked eye as a dim point of light with an apparent visual magnitude of +5.32.[3] The system is located at a distance of approximately Script error: No such module "convert". from the Sun, based on parallax,[2] and is drifting further away with a radial velocity of +44 km/s.[5] Since it is near the ecliptic, it can be occulted by the Moon[9] and, very rarely, by planets.
The primary, designated component A, is K-type giant star with a stellar classification of K5 III,[4] having exhausted the supply of hydrogen at its core, then cooled and expanded. At present it has 40[6] times the girth of the Sun. It is radiating 353[6] times the luminosity of the Sun at an effective temperature of Script error: No such module "val"..[2]
In Chinese astronomy, Ghost (Template:Zh) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri.[10] Theta Cancri is the first star of Ghost (Template:Zh), as it is also the determinative star for that asterism.[11]
References
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- ↑ a b Template:Cite XHIP
- ↑ a b c d e f g h Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c d Template:Cite DR2
- ↑ Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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