| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion[1] |
| Right ascension | 05h 34m 04.04753s[2] |
| Declination | −01° 28′ 12.8726″[2] |
| Apparent magnitude (V) | +5.92[1] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K4 III[3] |
| U−B color index | +1.87[4] |
| B−V color index | +1.535±0.008[1] |
| Astrometry | |
| Radial velocity (Rv) | 82.45±0.21[2] km/s |
| Proper motion (μ) | RA: −8.295[2] mas/yr Dec.: −31.553[2] mas/yr |
| Parallax (π) | 6.2074±0.0975 mas[2] |
| Distance | 525 ± 8 ly (161 ± 3 pc) |
| Absolute magnitude (MV) | −0.65[1] |
| Details | |
| Mass | 1.2[5] M☉ |
| Radius | 33.8[6] R☉ |
| Luminosity | 279[6] L☉ |
| Surface gravity (log g) | 1.43[7] cgs |
| Temperature | 4,058[6] K |
| Rotational velocity (v sin i) | 2.1[8] km/s |
| Age | 12.4[7] Gyr |
| Other designations | |
| BD−01°950, GC 6894, HD 36780, HIP 26108, HR 1874, SAO 132270[9] | |
| Database references | |
| SIMBAD | data |
HD 36780 is a star located in Orion's Belt, within the equatorial constellation of Orion. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.92.[1] The distance to this object is approximately 525 light years based on parallax.[2] It is drifting away from the Sun with a radial velocity of 82 km/s,[2] having come to within 185.6 light-years some 2.1 million years ago.[1]
This is an aging giant star with a stellar classification of K4 III.[3] After exhausting the supply of hydrogen at its core, the star cooled and expanded off the main sequence. At present it has around 34 times the girth of the Sun. It is radiating 279 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,058 K.[6]
References
- ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d e f g h Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
- ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ a b c d Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series. 268 (1): 4. arXiv:2208.11721. Bibcode:2023ApJS..268....4F. doi:10.3847/1538-4365/acdee5.
- ^ a b Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A.; Andrae, R.; Poggio, E.; Spitoni, E.; Contursi, G.; Zhao, H.; Oreshina-Slezak, I.; Ordenovic, C.; Bijaoui, A. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics. 669: A104. arXiv:2206.07937. Bibcode:2023A&A...669A.104K. doi:10.1051/0004-6361/202244283.
- ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
- ^ "HD 36780". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 March 2017.
