Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Cancer |
Right ascension | 08h 43m 17.14820s [1] |
Declination | +21° 28′ 06.6008″ [1] |
Apparent magnitude (V) | 4.673 [2] |
Characteristics | |
Spectral type | A1IV [3] |
U−B color index | +0.03 [4] |
B−V color index | +0.010 [2] |
Astrometry | |
Radial velocity (Rv) | 28.7 [5] km/s |
Proper motion (μ) |
RA: −103.51
[1]
mas/
yr Dec.: −39.48 [1] mas/ yr |
Parallax (π) | 18.00 ± 0.21 mas [1] |
Distance | 181 ± 2
ly (55.6 ± 0.6 pc) |
Absolute magnitude (MV) | +1.1 [6] |
Details | |
Mass | 2.18 [7] M☉ |
Radius | 2.5 [8] R☉ |
Luminosity | 36 [9] L☉ |
Surface gravity (log g) | 4.17 [7] cgs |
Temperature | 9,108 [9] K |
Rotational velocity (v sin i) | 86±6 [10] km/s |
Age | 171 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Cancri, or γ Cancri, is a star in the northern constellation of Cancer. It is formally named Asellus Borealis /əˈsɛləs bɒriˈælɪs/, the traditional name of the system. [12] Based on parallax measurements, it is located at a distance of approximately 181 light years 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, [13] but is now considered a single star. [14] [15] Since it is near the ecliptic, it can be occulted by the Moon [16] and, very rarely, by planets.
γ Cancri ( Latinised to Gamma Cancri) is the star's Bayer designation. It bore the traditional name Asellus Borealis ( Latin for "northern donkey"). [17] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [18] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [19] 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. [12] Together with Delta Cancri, it formed the Aselli, flanking Praesepe. [20]
In Chinese astronomy, Ghost ( Chinese: 鬼宿; pinyin: Guǐ Xiù) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri. [21] Gamma Cancri itself is known as the third star of Ghost ( Chinese: 鬼宿三; pinyin: Guǐ Xiù sān). [22]
Gamma Cancri presents as a white A-type subgiant with an apparent magnitude of +4.67. [3] The star is an estimated 171 [7] million years old and is spinning with a projected rotational velocity of 86 km/s. [10] It has 2.18 [7] times the mass of the Sun and shines with a luminosity approximately 36 times greater at an effective temperature of 9108 K. [9]
It has been included as a member of the Hyades Stream based on its distance, space motion, and likely age. [23]
Asellus Borealis
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Cancer |
Right ascension | 08h 43m 17.14820s [1] |
Declination | +21° 28′ 06.6008″ [1] |
Apparent magnitude (V) | 4.673 [2] |
Characteristics | |
Spectral type | A1IV [3] |
U−B color index | +0.03 [4] |
B−V color index | +0.010 [2] |
Astrometry | |
Radial velocity (Rv) | 28.7 [5] km/s |
Proper motion (μ) |
RA: −103.51
[1]
mas/
yr Dec.: −39.48 [1] mas/ yr |
Parallax (π) | 18.00 ± 0.21 mas [1] |
Distance | 181 ± 2
ly (55.6 ± 0.6 pc) |
Absolute magnitude (MV) | +1.1 [6] |
Details | |
Mass | 2.18 [7] M☉ |
Radius | 2.5 [8] R☉ |
Luminosity | 36 [9] L☉ |
Surface gravity (log g) | 4.17 [7] cgs |
Temperature | 9,108 [9] K |
Rotational velocity (v sin i) | 86±6 [10] km/s |
Age | 171 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Gamma Cancri, or γ Cancri, is a star in the northern constellation of Cancer. It is formally named Asellus Borealis /əˈsɛləs bɒriˈælɪs/, the traditional name of the system. [12] Based on parallax measurements, it is located at a distance of approximately 181 light years 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, [13] but is now considered a single star. [14] [15] Since it is near the ecliptic, it can be occulted by the Moon [16] and, very rarely, by planets.
γ Cancri ( Latinised to Gamma Cancri) is the star's Bayer designation. It bore the traditional name Asellus Borealis ( Latin for "northern donkey"). [17] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) [18] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. [19] 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. [12] Together with Delta Cancri, it formed the Aselli, flanking Praesepe. [20]
In Chinese astronomy, Ghost ( Chinese: 鬼宿; pinyin: Guǐ Xiù) refers to an asterism consisting of Theta Cancri, Eta Cancri, Gamma Cancri and Delta Cancri. [21] Gamma Cancri itself is known as the third star of Ghost ( Chinese: 鬼宿三; pinyin: Guǐ Xiù sān). [22]
Gamma Cancri presents as a white A-type subgiant with an apparent magnitude of +4.67. [3] The star is an estimated 171 [7] million years old and is spinning with a projected rotational velocity of 86 km/s. [10] It has 2.18 [7] times the mass of the Sun and shines with a luminosity approximately 36 times greater at an effective temperature of 9108 K. [9]
It has been included as a member of the Hyades Stream based on its distance, space motion, and likely age. [23]
Asellus Borealis