Gamma Cancri
Template:Location mark Location of γ 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) | 4.673[1] |
| Characteristics | |
| Spectral type | A1IV[3] |
| U−B Template:Engvar | +0.03[4] |
| B−V Template:Engvar | +0.010[1] |
| Astrometry | |
| Radial velocity (Rv) | 28.7[5] km/s |
| Proper motion (μ) | RA: −105.760 mas/yr[2] Dec.: −39.157 mas/yr[2] |
| Parallax (π) | 18.6431±0.1900 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.1[6] |
| Details | |
| Mass | 2.35±0.42[7] Template:Solar mass |
| Radius | 2.53±0.23[7] Template:Solar radius |
| Luminosity | 43.3±7.9[7] Template:Solar luminosity |
| Surface gravity (log g) | 4.00±0.25[7] cgs |
| Temperature | 9,311[7] K |
| Rotational velocity (v sin i) | Script error: No such module "val".[8] km/s |
| Age | 171[9] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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Gamma Cancri is a star in the northern constellation of Cancer. Its name is a Bayer designation that is Latinized from γ Cancri, and abbreviated Gamma Cnc or γ Cnc. This star is formally named Asellus Borealis, pronouced Template:IPAc-en, the traditional name of the system.[11] Based on parallax measurements, it is located at a distance of approximately Script error: No such module "convert". from the Sun. The star is drifting further away with a radial velocity of 29 km/s.[5]
In 1910 this star was reported to be a spectroscopic binary by O. J. Lee,[12] but is now considered a single star.[13][14] Since it is near the ecliptic, it can be occulted by the Moon.[15]
Nomenclature
γ Cancri (Latinised to Gamma Cancri) is the star's Bayer designation. It bore the traditional name Asellus Borealis (Latin for "northern donkey").[16] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[18] It approved the name Asellus Borealis for the star on 6 November 2016 and it is now so included in the List of IAU-approved Star Names.[11] Together with Delta Cancri, it formed the Aselli, flanking Praesepe.[19]
In Chinese astronomy, Ghost (Template:Zh) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri.[20] Gamma Cancri itself is known as the third star of Ghost (Template:Zh).[21]
Properties
Gamma Cancri presents as a white A-type subgiant with an apparent magnitude of +4.67.[3] The star is an estimated 171[9] million years old and is spinning with a projected rotational velocity of 86 km/s.[8] It has 2.35 times the mass of the Sun, 2.53 times the Sun's radius, and shines with a luminosity approximately 43 times greater at an effective temperature of 9,311 K.[7]
It has been included as a member of the Hyades Stream based on its distance, space motion, and estimated age.[22]
References
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- ↑ a b Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ Template:Cite simbad
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