HD 37320 (HR 1920, HIP 26487) is a star located in the constellationOrion.[a] It is an evolvedblue giant star, based on itsspectral type of B8III.[1] The distance to HD 37320 is calculated at 285.5parsecs (931 light-years), based on aparallax fromGaia EDR3.[2] Theapparent magnitude of the star is 5.852,[1] which is above thelimiting magnitude for naked-eye vision (6.5m), making it faintly visible to thenaked eye.[3]
| 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[4] km/s |
| Proper motion (μ) | RA: 10.602mas/yr[4] Dec.: -15.499mas/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[b] R☉ |
| Luminosity | 218.78[8] L☉ |
| Temperature | 12,303[8] K |
| Rotational velocity (v sin i) | 25[9] km/s |
| Other designations | |
| BD+07 953,Gaia DR2 3334369174165649536,Gaia DR3 3334369174165649536,HIP 26487,HR 1920,SAO 112979,PPM 149251,TIC 144611068,TYC 714-524-1,GSC 00714-00524,2MASS J05380112+0732292 | |
| Database references | |
| SIMBAD | data |
It is an evolvedblue giant star with aspectral type of B8III.[1] It radiates about 219 times thesolar luminosity by its photosphere at aneffective temperature of 12,300 K.[8] Its uniform diskangular 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 itsastronomical coordinates.[a] The distance to the star is 285.5parsecs (931light-years), based on a parallax of3.5025 mas fromGaia EDR3.[2] Theapparent 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 thenaked eye.[3] Theabsolute 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 theHenry Draper Catalogue designation for this star. Other designations include HR 1920 from theBright Star Catalogue, HIP 26487 from theHipparcos Catalogue and BD+07 953 from theBonner Durchmusterung catalogue.[1]
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