HD 37320

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.^[2] The apparent magnitude of the star is 5.852,^[1] which is above the limiting magnitude for naked-eye vision (6.5^m), making it faintly visible to the naked eye.^[3]

HD 37320

Observation data Epoch J2000      Equinox J2000
Constellation	Orion[a]
Right ascension	05^h 38^m 01.12^s[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[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

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.^[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.^[a] 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 5.852^m,^[1] which is above the limiting magnitude for naked-eye vision, generally defined as 6.5^m, 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]

Notes

1. Obtained with a right ascension of 05^h 38^m 01.12^s and a declination of +07° 32′ 29.1″^[1] on this website.
2. From an angular diameter of 0.153 milliarcseconds^[7] and a distance of 285.5 parsecs.^[2]

References

1. "HD 37320". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-05-05.
2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
3. "University Lowbrow Astronomers Naked Eye Observer's Guide". websites.umich.edu. Retrieved 2024-05-05.
4. Brandt, Timothy D. (2021-06-01). "The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition". The Astrophysical Journal Supplement Series. 254 (2): 42. arXiv:2105.11662. Bibcode:2021ApJS..254...42B. doi:10.3847/1538-4365/abf93c. ISSN 0067-0049. Data about this star is available here at VizieR.
5. "HIP-26487 (Star)". In-the-sky. Retrieved 2024-05-05.
6. 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. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. ISSN 0004-6361. Data about the star is available here at VizieR.
7. Challouf, M.; Nardetto, N.; Mourard, D.; Graczyk, D.; Aroui, H.; Chesneau, O.; Delaa, O.; Pietrzyński, G.; Gieren, W.; Ligi, R.; Meilland, A.; Perraut, K.; Tallon-Bosc, I.; McAlister, H.; Brummelaar, T. ten (2014-10-01). "Improving the surface brightness-color relation for early-type stars using optical interferometry". Astronomy & Astrophysics. 570: A104. arXiv:1409.1351. Bibcode:2014A&A...570A.104C. doi:10.1051/0004-6361/201423772. ISSN 0004-6361.
8. 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. arXiv:1608.05508. Bibcode:2017A&A...597A..22S. doi:10.1051/0004-6361/201628541. ISSN 0004-6361. Data about the star is available here at VizieR.
9. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002-07-01). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. ISSN 0004-637X. Available here in VizieR.