Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 49m 50.45933s [1] |
Declination | −32° 30′ 30.5225″ [1] |
Apparent magnitude (V) | +3.87 [2] |
Characteristics | |
Spectral type | B1.5 Ve [3] |
U−B color index | −0.97 [2] |
B−V color index | −0.20 [2] |
Variable type | γ Cas [3] |
Astrometry | |
Radial velocity (Rv) | +14.0±4.1 [4] km/s |
Proper motion (μ) |
RA: −8.84
[1]
mas/
yr Dec.: +3.73 [1] mas/ yr |
Parallax (π) | 4.95 ± 0.12 mas [1] |
Distance | 660 ± 20
ly (202 ± 5 pc) |
Absolute magnitude (MV) | −3.03 [5] |
Details | |
Mass | 12.2±0.3 [6] M☉ |
Radius | 5.9 [7] R☉ |
Luminosity (bolometric) | 18,876 [8] L☉ |
Surface gravity (log g) | 4.07 [7] cgs |
Temperature | 24,600 [7] K |
Age | 13.3±1.2 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Kappa Canis Majoris, Latinized from κ Canis Majoris, is a solitary, [10] blue-white hued star in the constellation Canis Major. It is visible to the naked eye with an apparent visual magnitude of +3.87. [2] Based upon an annual parallax shift of 7.70 mas as seen from Earth, [1] this star is located about 660 light years from the Sun.
This is a B-type main-sequence star with a stellar classification of B1.5 Ve, [3] although Hiltner et al. (1969) classified it as B1.5 IVe [13] suggesting it is a subgiant star. The 'e' suffix indicates it is a rapidly rotating Be star with a circumstellar decretion disk of heated gas. [7] The radius of the emitting disk is about 0.20±0.06 AU, or about 3.7 times the radius of the star. [14] It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +3.4 to +3.97. [3] The star became 50% brighter between 1963 and 1978, increasing from magnitude 3.96 or so to 3.52. [15]
In Chinese, 弧矢 (Hú Shǐ), meaning Bow and Arrow, [16] refers to an asterism consisting of κ Canis Majoris, δ Canis Majoris, η Canis Majoris, HD 63032, HD 65456, ο Puppis, k Puppis, ε Canis Majoris and π Puppis. Consequently, κ Canis Majoris itself is known as 弧矢八 (Hú Shǐ bā, English: the Eighth Star of Bow and Arrow.) [17]
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cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Canis Major |
Right ascension | 06h 49m 50.45933s [1] |
Declination | −32° 30′ 30.5225″ [1] |
Apparent magnitude (V) | +3.87 [2] |
Characteristics | |
Spectral type | B1.5 Ve [3] |
U−B color index | −0.97 [2] |
B−V color index | −0.20 [2] |
Variable type | γ Cas [3] |
Astrometry | |
Radial velocity (Rv) | +14.0±4.1 [4] km/s |
Proper motion (μ) |
RA: −8.84
[1]
mas/
yr Dec.: +3.73 [1] mas/ yr |
Parallax (π) | 4.95 ± 0.12 mas [1] |
Distance | 660 ± 20
ly (202 ± 5 pc) |
Absolute magnitude (MV) | −3.03 [5] |
Details | |
Mass | 12.2±0.3 [6] M☉ |
Radius | 5.9 [7] R☉ |
Luminosity (bolometric) | 18,876 [8] L☉ |
Surface gravity (log g) | 4.07 [7] cgs |
Temperature | 24,600 [7] K |
Age | 13.3±1.2 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Kappa Canis Majoris, Latinized from κ Canis Majoris, is a solitary, [10] blue-white hued star in the constellation Canis Major. It is visible to the naked eye with an apparent visual magnitude of +3.87. [2] Based upon an annual parallax shift of 7.70 mas as seen from Earth, [1] this star is located about 660 light years from the Sun.
This is a B-type main-sequence star with a stellar classification of B1.5 Ve, [3] although Hiltner et al. (1969) classified it as B1.5 IVe [13] suggesting it is a subgiant star. The 'e' suffix indicates it is a rapidly rotating Be star with a circumstellar decretion disk of heated gas. [7] The radius of the emitting disk is about 0.20±0.06 AU, or about 3.7 times the radius of the star. [14] It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +3.4 to +3.97. [3] The star became 50% brighter between 1963 and 1978, increasing from magnitude 3.96 or so to 3.52. [15]
In Chinese, 弧矢 (Hú Shǐ), meaning Bow and Arrow, [16] refers to an asterism consisting of κ Canis Majoris, δ Canis Majoris, η Canis Majoris, HD 63032, HD 65456, ο Puppis, k Puppis, ε Canis Majoris and π Puppis. Consequently, κ Canis Majoris itself is known as 弧矢八 (Hú Shǐ bā, English: the Eighth Star of Bow and Arrow.) [17]
{{
cite web}}
: CS1 maint: postscript (
link)