Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Piscis Austrinus |
Right ascension | 22h 40m 39.34075s [1] |
Declination | −27° 02′ 37.0157″ [1] |
Apparent magnitude (V) | +4.17 [2] |
Characteristics | |
Spectral type | B8 Ve [3] or B8 IVe [4] |
U−B color index | −0.31 [2] |
B−V color index | −0.11 [2] |
Astrometry | |
Radial velocity (Rv) | +1.1±2.8 [5] km/s |
Proper motion (μ) |
RA: +23.22
[1]
mas/
yr Dec.: −0.16 [1] mas/ yr |
Parallax (π) | 8.0981 ± 0.3582 mas [6] |
Distance | 400 ± 20
ly (123 ± 5 pc) |
Absolute magnitude (MV) | −1.66 [4] |
Details | |
Mass | 4.10±0.19 [7] M☉ |
Radius | 3.2 [8] R☉ |
Luminosity | 661 [7] L☉ |
Surface gravity (log g) | 3.93 [9] cgs |
Temperature | 11,066 [7] K |
Rotational velocity (v sin i) | 216 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Piscis Austrini, Latinized from ε Piscis Austrini, is a blue-white hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.17. [2] Based upon an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite, the system is located roughly 400 light years from the Sun. [6]
This is a B-type main sequence star with a stellar classification of B8 Ve. [3] It is a Be star that is spinning rapidly with a projected rotational velocity of 216 km/s, [7] compared to an equatorial critical velocity of 301 km/s. [9] The star has 4.1 times the mass of the Sun and is radiating 661 times the solar luminosity from its photosphere at an effective temperature of 11,066 K. [7]
Epsilon Piscis Austrini is moving through the Galaxy at a speed of 18.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,917 and 28,138 light-years from the center of the Galaxy. [11]
In Chinese, 羽林軍 (Yǔ Lín Jūn), meaning Palace Guard, refers to an asterism consisting of:
Consequently, the Chinese name for ε Piscis Austrini itself is 羽林軍八 (Yǔ Lín Jūn bā, English: the Eighth Sixth Star of Palace Guard.) [12]
Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Piscis Austrinus |
Right ascension | 22h 40m 39.34075s [1] |
Declination | −27° 02′ 37.0157″ [1] |
Apparent magnitude (V) | +4.17 [2] |
Characteristics | |
Spectral type | B8 Ve [3] or B8 IVe [4] |
U−B color index | −0.31 [2] |
B−V color index | −0.11 [2] |
Astrometry | |
Radial velocity (Rv) | +1.1±2.8 [5] km/s |
Proper motion (μ) |
RA: +23.22
[1]
mas/
yr Dec.: −0.16 [1] mas/ yr |
Parallax (π) | 8.0981 ± 0.3582 mas [6] |
Distance | 400 ± 20
ly (123 ± 5 pc) |
Absolute magnitude (MV) | −1.66 [4] |
Details | |
Mass | 4.10±0.19 [7] M☉ |
Radius | 3.2 [8] R☉ |
Luminosity | 661 [7] L☉ |
Surface gravity (log g) | 3.93 [9] cgs |
Temperature | 11,066 [7] K |
Rotational velocity (v sin i) | 216 [7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Piscis Austrini, Latinized from ε Piscis Austrini, is a blue-white hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.17. [2] Based upon an annual parallax shift of 8.0981 ± 0.3582 mas as seen from the GAIA satellite, the system is located roughly 400 light years from the Sun. [6]
This is a B-type main sequence star with a stellar classification of B8 Ve. [3] It is a Be star that is spinning rapidly with a projected rotational velocity of 216 km/s, [7] compared to an equatorial critical velocity of 301 km/s. [9] The star has 4.1 times the mass of the Sun and is radiating 661 times the solar luminosity from its photosphere at an effective temperature of 11,066 K. [7]
Epsilon Piscis Austrini is moving through the Galaxy at a speed of 18.7 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,917 and 28,138 light-years from the center of the Galaxy. [11]
In Chinese, 羽林軍 (Yǔ Lín Jūn), meaning Palace Guard, refers to an asterism consisting of:
Consequently, the Chinese name for ε Piscis Austrini itself is 羽林軍八 (Yǔ Lín Jūn bā, English: the Eighth Sixth Star of Palace Guard.) [12]