Astronomy:HD 37320
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] km/s |
| Proper motion (μ) | RA: 10.602[2] mas/yr Dec.: -15.499[2] mas/yr |
| Parallax (π) | 3.5025 ± 0.0568[3] mas |
| Distance | 930 ± 20 ly (286 ± 5 pc) |
| Absolute magnitude (MV) | -1.43[4] |
| Details | |
| Mass | 5.644±0.282[5] M☉ |
| Radius | 4.696[lower-alpha 2] R☉ |
| Luminosity | 218.78[7] L☉ |
| Temperature | 12,303[7] K |
| Rotational velocity (v sin i) | 25[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[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]
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.[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.[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]
Notes
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 "HD 37320". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+37320.
- ↑ 2.0 2.1 2.2 Brandt, Timothy D. (2021-06-01). "The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series 254 (2): 42. doi:10.3847/1538-4365/abf93c. ISSN 0067-0049. Bibcode: 2021ApJS..254...42B. Data about this star is available here at VizieR.
- ↑ 3.0 3.1 3.2 3.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 4.0 4.1 "HIP-26487 (Star)". https://in-the-sky.org/data/object.php?id=TYC714-524-1.
- ↑ 5.0 5.1 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (2019-03-01). "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly". Astronomy and Astrophysics 623: A72. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Bibcode: 2019A&A...623A..72K. https://ui.adsabs.harvard.edu/abs/2019A&A...623A..72K. Data about the star is available here at VizieR.
- ↑ 6.0 6.1 Challouf, M.; Nardetto, N.; Mourard, D.; Graczyk, D.; Aroui, H.; Chesneau, O.; Delaa, O.; Pietrzyński, G. et al. (2014-10-01). "Improving the surface brightness-color relation for early-type stars using optical interferometry" (in en). Astronomy & Astrophysics 570: A104. doi:10.1051/0004-6361/201423772. ISSN 0004-6361. Bibcode: 2014A&A...570A.104C. https://www.aanda.org/articles/aa/abs/2014/10/aa23772-14/aa23772-14.html.
- ↑ 7.0 7.1 7.2 Simón-Díaz, S.; Godart, M.; Castro, N.; Herrero, A.; Aerts, C.; Puls, J.; Telting, J.; Grassitelli, L. (2017-01-01). "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars". Astronomy and Astrophysics 597: A22. doi:10.1051/0004-6361/201628541. ISSN 0004-6361. Bibcode: 2017A&A...597A..22S. https://ui.adsabs.harvard.edu/abs/2017A&A...597A..22S. Data about the star is available here at VizieR.
- ↑ 8.0 8.1 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002-07-01). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. ISSN 0004-637X. Bibcode: 2002ApJ...573..359A. https://ui.adsabs.harvard.edu/abs/2002ApJ...573..359A. Available here in VizieR.
- ↑ 9.0 9.1 "University Lowbrow Astronomers Naked Eye Observer's Guide.". https://websites.umich.edu/~lowbrows/guide/eye.html.
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