Sigma Persei
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Location of σ Persei (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.36[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | K3III[4] |
| U−B color index | +1.54[2] |
| B−V color index | +1.35[2] |
| Astrometry | |
| Radial velocity (Rv) | +14.32±0.15[1] km/s |
| Proper motion (μ) | RA: +3.954 mas/yr[1] Dec.: +18.968 mas/yr[1] |
| Parallax (π) | 9.5060±0.2003 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.85[5] |
| Details | |
| Mass | 1.32[3] M☉ |
| Radius | 36.89[3] R☉ |
| Luminosity | 368[3] L☉ |
| Surface gravity (log g) | 1.46[3] cgs |
| Temperature | 4,165[3] K |
| Metallicity [Fe/H] | −0.20[3] dex |
| Rotational velocity (v sin i) | 2.2[6] km/s |
| Age | 6.6[3] Gyr |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
Sigma Persei (Sigma Per, σ Persei, σ Per) is an orange K-type giant star[4] with an apparent magnitude of +4.36.[2] It is approximately 343 light-years from Earth.[1]
Sigma Persei is moving through the Galaxy at a speed of 17.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,400 and 43,600 light years from the center of the Galaxy. It came closest to the Sun 5.1 million years ago when it had brightened to magnitude 3.11 from a distance of 202 light years.[8]
In 2014 a planet was reported, Sigma Persei b, with a period of 580 days and a mass approximately 6.5 times that of Jupiter.[9] However, a 2025 study found that the observed radial velocity variations are intrinsic to the star, and not caused by a planetary companion.[10]
Name and etymology
This star, together with δ Per, ψ Per, α Per, γ Per and η Per, has been called the Segment of Perseus.[11]
References
- ^ a b c d e f Template:Cite Gaia DR3
- ^ a b c d Page Module:Citation/CS1/styles.css has no content.Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b c d e f g h Page Module:Citation/CS1/styles.css has no content.Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
- ^ a b Page Module:Citation/CS1/styles.css has no content.Hoffleit, D.; Warren, W. H. (1995). "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. Bibcode:1995yCat.5050....0H.
- ^ Page Module:Citation/CS1/styles.css has no content.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. S2CID 119257644. Vizier catalog entry
- ^ Page Module:Citation/CS1/styles.css has no content.Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003. arXiv:0709.1145. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233.
- ^ Page Module:Citation/CS1/styles.css has no content."* sig Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 April 2025.
{{cite web}}: Invalid|mode=Script error: No such module "Citation mode".(help) - ^ Sigma Persei (HIP 16335)
- ^ Page Module:Citation/CS1/styles.css has no content.Lee, Byeong-Cheol; Han, Inwoo; Park, Myeong-Gu; Mkrtichian, David E.; Jeong, Gwanghui; Kim, Kang-Min; Valyavin, Gennady (2014). "PLANETARY COMPANION IN K GIANT σ PERSEI". Journal of the Korean Astronomical Society. 47 (2): 69. arXiv:1405.2130. Bibcode:2014JKAS...47...69L. doi:10.5303/JKAS.2014.47.2.69.
- ^ Page Module:Citation/CS1/styles.css has no content.Spaeth, Dane; Reffert, Sabine; Trifonov, Trifon; Kaminski, Adrian; Albrecht, Simon; Grundahl, Frank; Fredslund Andersen, Mads; Quirrenbach, Andreas; Pallé, Pere L. (2025). "Precise radial velocities of giant stars. XVII. Distinguishing planets from intrinsically induced radial velocity signals in evolved stars". Astronomy & Astrophysics. arXiv:2504.09087. doi:10.1051/0004-6361/202453500.
- ^ Page Module:Citation/CS1/styles.css has no content.Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 331. ISBN 0-486-21079-0. Retrieved 2012-09-04.
{{cite book}}: ISBN / Date incompatibility (help)
