Beta Piscium
Template:Location mark Location of β Piscium (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.40[2] |
| Characteristics | |
| Spectral type | B6Ve[3] |
| U−B Template:Engvar | −0.48[4] |
| B−V Template:Engvar | −0.12[4] |
| Variable type | Suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | 0.0 ± 0.6[6] km/s |
| Proper motion (μ) | RA: 11.76[1] mas/yr Dec.: −9.85[1] mas/yr |
| Parallax (π) | 7.99±0.22 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.01[7] |
| Details[3] | |
| Mass | 4.7 Template:Solar mass |
| Radius | 3.6 Template:Solar radius |
| Luminosity | 523.6[8] Template:Solar luminosity |
| Surface gravity (log g) | 4.0 cgs |
| Temperature | 15500 K |
| Rotational velocity (v sin i) | 90 ± 15 km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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Beta Piscium or β Piscium, formally named Fumalsamakah Template:IPAc-en,[10] is a blue-white hued star in the zodiac constellation of Pisces. Its apparent magnitude is 4.40,[2] meaning it can be faintly seen with the naked eye. Based on parallax measurements taken during the Hipparcos mission, it is about 410 light-years (125 parsecs) distant from the Sun.[1]
Nomenclature
β Piscium (Latinised to Beta Piscium) is the star's Bayer designation.
It bore the traditional name Fum al Samakah from the Arabic فم السمكة fum al-samakah "mouth of the fish" (compare Fomalhaut).[11][12] In 2016, the IAU organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN approved the name Fumalsamakah for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[10]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Thunderbolt, refers to an asterism consisting of Beta Piscium and Gamma, Theta, Iota and Omega Piscium. Consequently, the Chinese name for Beta Piscium itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[14]
Properties
Beta Piscium is a Be star,[9] a special class of B-type stars with emission lines in their spectra. With a spectral type of B6Ve[3] its mass is estimated to be about Template:Solar mass, and its radius is about Template:Solar radius.[3] It is suspected to be a variable star.[5] Beta Piscium is radiating 524[8] times the Sun's luminosity from its photosphere at an effective temperature of 15,500 K.[3] The star has a high rate of spin, showing a projected rotational velocity of around 90 km/s.[8] Beta Piscium does not appear to have companion stars.[15]
References
- ↑ a b c d e f Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
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- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Template:Cite simbad
- ↑ a b Script error: No such module "citation/CS1".
- ↑ HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, Kostjuk 2002, refer to table3.dat
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日 Template:Webarchive
- ↑ Script error: No such module "Citation/CS1".