15 Orionis
15 Orionis is a class F2IV[3] (early F-type subgiant) star in the constellation Orion. Its apparent magnitude is 4.82[2] and it is approximately 540 light years away based on parallax.[1] It is the southern pole star of Uranus.
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 09m 41.95770s[1] |
| Declination | 15° 35′ 50.0410″[1] |
| Apparent magnitude (V) | 4.82[2] |
| Characteristics | |
| Spectral type | F2IV[3] |
| U−B color index | +0.19[2] |
| B−V color index | +0.32[2] |
| Astrometry | |
| Radial velocity (Rv) | +28.79[4] km/s |
| Proper motion (μ) | RA: -2.71[1] mas/yr Dec.: -15.75[1] mas/yr |
| Parallax (π) | 6.06 ± 1.97[1] mas |
| Distance | approx. 500 ly (approx. 170 pc) |
| Absolute magnitude (MV) | -0.04[5] |
| Details | |
| Mass | 3.42[6] M☉ |
| Radius | 5.9[7] R☉ |
| Luminosity | 300[6] L☉ |
| Surface gravity (log g) | 3.75[8] cgs |
| Temperature | 7,161[6] K |
| Metallicity [Fe/H] | +0.21[8] dex |
| Rotational velocity (v sin i) | 60[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
It has one suspected companion, B, at a separation of 0.3".[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Van Leeuwen, F.. Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2) (2007). p. 653–664. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ↑ 2.0 2.1 2.2 2.3 Ducati, J. R.. VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system. CDS/ADC Collection of Electronic Catalogues 2237 (2002).
- ↑ 3.0 3.1 Hoffleit, D.. VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991). VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H 5050 (1995).
- ↑ Massarotti, Alessandro. Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity. The Astronomical Journal 135 (1) (2008). p. 209–231. doi:10.1088/0004-6256/135/1/209.
- ↑ Anderson, E.. XHIP: An extended hipparcos compilation. Astronomy Letters 38 (5) (2012). p. 331. doi:10.1134/S1063773712050015. Vizier catalog entry
- ↑ 6.0 6.1 6.2 6.3 Zorec, J.. Rotational velocities of A-type stars. Astronomy & Astrophysics 537 (2012). p. A120. doi:10.1051/0004-6361/201117691. Vizier catalog entry
- ↑ Allende Prieto, C.. Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures. Astronomy and Astrophysics 352 (1999). p. 555–562. Vizier catalog entry
- ↑ 8.0 8.1 Wu, Yue. Coudé-feed stellar spectral library – atmospheric parameters. Astronomy & Astrophysics 525 (2010). p. A71. doi:10.1051/0004-6361/201015014.
- ↑ Mason, Brian D.. The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog. The Astronomical Journal 122 (6) (2001). p. 3466. doi:10.1086/323920. Vizier catalog entry