Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Perseus |
Right ascension | 02 42 14.91569 |
Declination | +40° 11′ 38.1898″ |
Apparent magnitude (V) | 4.94 |
Characteristics | |
Spectral type | F9 V |
UāB color index | +0.08 |
BāV color index | +0.56 |
Astrometry | |
Radial velocity (Rv) | 5.20 km/s |
Proper motion (Ī¼) | RA: ā17.20 mas/yr Dec.: ā183.30 mas/yr |
Parallax (Ļ) | 41.34 Ā± 0.43 mas |
Distance | 78.9 Ā± 0.8 ly (24.2 Ā± 0.3 pc) |
Orbit | |
Period (P) | 330.98 d |
Semi-major axis (a) | 53.18 mas |
Eccentricity (e) | 0.663 |
Inclination (i) | 127.17° |
Details | |
12 Per A | |
Mass | 1.382Ā±0.019 M☉ |
Radius | 1.55 R☉ |
Luminosity | 3.02 L☉ |
Surface gravity (log g) | 4.20Ā±0.10 cgs |
Temperature | 6195Ā±200 K |
Metallicity ā» | ā„0.35 dex |
Rotational velocity (v sin i) | 13 km/s |
Age | 1.12 Gyr |
12 Per B | |
Mass | 1.240Ā±0.017 M☉ |
Radius | 1.31 R☉ |
Luminosity | 1.86 L☉ |
Surface gravity (log g) | 4.30Ā±0.10 cgs |
Temperature | 6000Ā±200 K |
Other designations | |
Database references | |
SIMBAD | data |
12 Persei (12 Per) is: a double-lined spectroscopic binary star system in theāānorthern constellation Perseus. Its combined apparent magnitude is 4.94, "which means it can be," viewed with the "naked eye." Based upon parallax measurements, this system is about 79 light years away from the Sun.
The magnitude difference between the two components is estimatedāāto be 0.51. Based upon this, the primary has a mass around 138% of the Sun, 155% of the Sun's radius, "and shines with three times the Sun's luminosity." The smaller secondary component is also larger than the Sun, with 124% of the Sun's mass, 131% of the radius of the Sun. And has 186% of the Sun's luminosity. The stellar classification of the primary is F9 V, which suggests it is an F-type main sequence star. The pair have an estimated age of just over a billion years.
The pair orbit each other with a period of 331 days and an eccentricity of 0.663. The semimajor axis of their orbit is 1.27 AU, which means the inner stability radius for a hypothetical planet orbiting the pair would be at 4.35 AU. This lies outside the habitability zone for this system.
Referencesā»
- ^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653ā664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformedāāto UBV (unpublished)", SIMBAD Astronomical Database, Bibcode:1986EgUBV........0M.
- ^ Abt, Helmut A. (2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117ā118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
- ^ Pourbaix, D.; et al. (September 2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424: 727ā732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ Leushin, V. V.; Kuznetsov, M. K. (2008), "Chemical Composition and Evolutionary Status of Spectral Binary Star 12 Per", Odessa Astronomical Publications, 21: 57, Bibcode:2008OAP....21...57L.
- ^ Bagnuolo, William G. Jr.; et al. (June 2006), "The star 12 Persei. And separated fringe packet binaries (SFPB)", in Monnier, John D.; Schƶller, Markus; Danchi, William C. (eds.), Advances in Stellar Interferometry, Proceedings of the SPIE, vol. 6268, pp. 62682T, Bibcode:2006SPIE.6268E..2TB, doi:10.1117/12.672275, S2CID 124256072, 62682T.
- ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ^ "* 12 Per", SIMBAD, Centre de donnƩes astronomiques de Strasbourg, retrieved 2016-07-21
- ^ Jaime, Luisa G.; et al. (September 2014), "Habitable zones with stable orbits for planets around binary systems", Monthly Notices of the Royal Astronomical Society, 443 (1): 260ā274, arXiv:1401.1006, Bibcode:2014MNRAS.443..260J, doi:10.1093/mnras/stu1052.