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Blue giant star in the constellation Orion From Wikipedia, the free encyclopedia
HD 37320 (HR 1920, HIP 26487) is a star located in the constellation Orion.[lower-alpha 1] It is an evolved blue giant star, based on its spectral type of B8III.[1] The distance to HD 37320 is calculated at 285.5 parsecs (931 light-years), based on a parallax from Gaia EDR3.[2] The apparent magnitude of the star is 5.852,[1] which is above the limiting magnitude for naked-eye vision (6.5m), making it faintly visible to the naked eye.[3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Orion[lower-alpha 1] |
Right ascension | 05h 38m 01.12s[1] |
Declination | +07° 32′ 29.1″[1] |
Apparent magnitude (V) | 5.852±0.009[1] |
Characteristics | |
Evolutionary stage | Blue giant |
Spectral type | B7III[1] |
Apparent magnitude (U) | 5.44[1] |
Apparent magnitude (B) | 5.788[1] |
Apparent magnitude (G) | 5.844[1] |
Apparent magnitude (J) | 5.933[1] |
Apparent magnitude (H) | 5.997[1] |
Apparent magnitude (K) | 5.964[1] |
Astrometry | |
Radial velocity (Rv) | 20.1±1[4] km/s |
Proper motion (μ) | RA: 10.602 mas/yr[4] Dec.: -15.499 mas/yr[4] |
Parallax (π) | 3.5025 ± 0.0568 mas[2] |
Distance | 930 ± 20 ly (286 ± 5 pc) |
Absolute magnitude (MV) | -1.43[5] |
Details | |
Mass | 5.644±0.282[6] M☉ |
Radius | 4.696[lower-alpha 2] R☉ |
Luminosity | 218.78[8] L☉ |
Temperature | 12,303[8] K |
Rotational velocity (v sin i) | 25[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
It is an evolved blue giant star with a spectral type of B8III.[1] It radiates about 219 times the solar luminosity by its photosphere at an effective temperature of 12,300 K.[8] Its uniform disk angular diameter is measured at 0.153 milliarcseconds.[7] At the estimated distance by Gaia EDR3, it yields a physical size of 4.696 R☉. The star has a mass of 5.644 M☉[6] and rotates under its own axis at a speed of 25 km/s.[9]
HD 37320 is located within the constellation Orion, based on its astronomical coordinates.[lower-alpha 1] The distance to the star is 285.5 parsecs (931 light-years), based on a parallax of 3.5025 mas from Gaia EDR3.[2] The apparent magnitude of the star, i.e. its brightness as seen from Earth, is of 5.852m,[1] which is above the limiting magnitude for naked-eye vision, generally defined as 6.5m, making it faintly visible to the naked eye.[3] The absolute magnitude of HD 37320, i.e. its brightness if it was seen at 10 parsecs (32.6 ly), is -1.43.[5] It is moving away from Earth at a velocity of 20.1 km/s.[4]
HD 37320 is the Henry Draper Catalogue designation for this star. Other designations include HR 1920 from the Bright Star Catalogue, HIP 26487 from the Hipparcos Catalogue and BD+07 953 from the Bonner Durchmusterung catalogue.[1]
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