Eta Persei
Eta Persei (η Persei) is a binary star in the constellation Perseus. The stars that make the binary system are called Eta Persei A and Eta Persei B. Eta Persei A is also called Miram.[7]
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 50m 41.766s[1] |
| Declination | +55° 53′ 43.7876″[1] |
| Apparent magnitude (V) | 3.79[2] |
| Characteristics | |
| Spectral type | K3 Ib[3] |
| U−B color index | +1.90[2] |
| B−V color index | +1.69[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.07 ± 0.27[4] km/s |
| Proper motion (μ) | RA: +16.574[1] mas/yr Dec.: −12.709[1] mas/yr |
| Parallax (π) | 4.2061 ± 0.3744[1] mas |
| Distance | 780 ± 70 ly (240 ± 20 pc) |
| Absolute magnitude (MV) | −4.29[5] |
| Details | |
| Radius | 134[6] R☉ |
| Luminosity | 4,130[6] L☉ |
| Temperature | 3,986±170[6] K |
| Rotational velocity (v sin i) | 5.8[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Eta Persei Media
η Persei in optical light
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Template:Cite DR2
- ↑ 2.0 2.1 2.2 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 De Medeiros, J. R.. A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars. Astronomy and Astrophysics 395 (2002). p. 97–98. doi:10.1051/0004-6361:20021214.
- ↑ Famaey, B.. Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters. Astronomy and Astrophysics 430 (2005). p. 165. doi:10.1051/0004-6361:20041272.
- ↑ Ryon, Jenna. Comparing the Ca ii H and K Emission Lines in Red Giant Stars. Publications of the Astronomical Society of the Pacific 121 (882) (2009). p. 842. doi:10.1086/605456.
- ↑ 6.0 6.1 6.2 Messineo, M.. A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2. The Astronomical Journal 158 (1) (2019). p. 20. doi:10.3847/1538-3881/ab1cbd.
- ↑ Naming StarsIAU.org. Retrieved 16 December 2017.
