HD 37320
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.[a] 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.[3] 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.[9]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion[a] |
| 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[2] km/s |
| Proper motion (μ) | RA: 10.602 mas/yr[2] Dec.: -15.499 mas/yr[2] |
| Parallax (π) | 3.5025±0.0568 mas[3] |
| Distance | 930 ± 20 ly (286 ± 5 pc) |
| Absolute magnitude (MV) | -1.43[4] |
| Details | |
| Mass | 5.644±0.282[5] M☉ |
| Radius | 4.696[b] R☉ |
| Luminosity | 218.78[7] L☉ |
| Temperature | 12,303[7] K |
| Rotational velocity (v sin i) | 25[8] km/s |
| Other designations | |
| BD+07 953, HIP 26487, HR 1920, SAO 112979, PPM 149251, TIC 144611068, TYC 714-524-1, GSC 00714-00524, 2MASS J05380112+0732292, Gaia DR2 3334369174165649536, Gaia DR3 3334369174165649536 | |
| Database references | |
| SIMBAD | data |
Characteristics
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.[7] Its uniform disk angular diameter is measured at 0.153 milliarcseconds.[6] 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☉[5] and rotates under its own axis at a speed of 25 km/s.[8]
HD 37320 is located within the constellation Orion, based on its astronomical coordinates.[a] The distance to the star is 285.5 parsecs (931 light-years), based on a parallax of 3.5025 mas from Gaia EDR3.[3] 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.[9] The absolute magnitude of HD 37320, i.e. its brightness if it was seen at 10 parsecs (32.6 ly), is -1.43.[4] It is moving away from Earth at a velocity of 20.1 km/s.[2]
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]