Iota Canis Majoris
Template:Location mark Location of ι Canis Majoris (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.40[2] (4.36 - 4.40[3]) |
| Characteristics | |
| Spectral type | B3 Ib[4] or B3 Ib/II[5] |
| U−B Template:Engvar | −0.74[6] |
| B−V Template:Engvar | −0.07[6] |
| Variable type | Beta Cephei?[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 0.9453±0.1857 mas[1] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[7] |
| Absolute magnitude (MV) | −5.51[8] |
| Details[7] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | 52,480 Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | −0.17[9] dex |
| Rotational velocity (v sin i) | Script error: No such module "val". km/s |
| Age | Script error: No such module "val". Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
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Iota Canis Majoris, Latinized from ι Canis Majoris, is a solitary[10] variable supergiant star in the southern constellation of Canis Major. It is visible to the naked eye with an apparent visual magnitude that varies between +4.36 and +4.40.[3] The distance to this star is approximately 2,500 light years based on spectroscopic measurements.[7] It is drifting further away with a radial velocity of +42 km/s.[1]
Iota Canis Majoris is a massive blue-white B-type supergiant with a stellar classification of B3 Ib.[4] It has been classified as a Beta Cephei type variable star,[3] but the supergiant spectral type and a period of over a day mean it is no longer considered to be of that type.[2] This star is 15 million years old and is spinning with a projected rotational velocity of 30 km/s. It has 14 times more mass and 32 times the radius of the Sun. Iota Canis Majoris is radiating 52,000 times the luminosity of the Sun from its photosphere at an effective temperature of Script error: No such module "val"..[7]
The star displays a bow shock feature from its interaction with the interstellar medium, but this nebulosity is not aligned with the star's motion through the galaxy.[12]
References
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