Loading AI tools
Quadruple star system in the constellation Pyxis From Wikipedia, the free encyclopedia
Epsilon Pyxidis (ε Pyxidis) is quadruple[11] star system in the southern constellation of Pyxis. It is faintly visible to the naked eye, having a combined apparent visual magnitude of +5.60.[2] Based upon an annual parallax shift of 15.39 mas as seen from Earth,[1] it is located around 212 light years from the Sun. The system is deemed to be a member of the Sirius supercluster of stars that share a common motion through space.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Pyxis |
Right ascension | 09h 09m 56.41024s[1] |
Declination | −30° 21′ 55.4460″[1] |
Apparent magnitude (V) | +5.60[2] |
Characteristics | |
Spectral type | A4 IV[3] |
U−B color index | +0.16[2] |
B−V color index | +0.16[2] |
Astrometry | |
Radial velocity (Rv) | −9.7±0.3[4] km/s |
Proper motion (μ) | RA: −1.93[1] mas/yr Dec.: −48.99[1] mas/yr |
Parallax (π) | 15.39 ± 0.30 mas[1] |
Distance | 212 ± 4 ly (65 ± 1 pc) |
Absolute magnitude (MV) | +2.00[5] |
Details | |
ε Pyx A | |
Mass | 2.07[6] M☉ |
Luminosity | 19[7] L☉ |
Surface gravity (log g) | 3.26[8] cgs |
Temperature | 6368±1806[8] K |
Metallicity [Fe/H] | +0.04[8] dex |
Rotational velocity (v sin i) | 108.3±0.3[9] km/s |
Age | 560[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
The primary, component A, is a white-hued A-type subgiant star with a stellar classification of A4 IV.[3] It is a microvariable, showing a 0.0056 change in magnitude with a frequency of 0.16245 times per day.[12] Epsilon Pyxidis has been catalogued as an Am star,[2] although this remains uncertain.[13] It has double[6] the mass of the Sun and radiates 19[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,368 K.[8]
In addition to a close companion of unknown type at an angular separation of 0.17 arc seconds, the primary shares an orbit with a binary star system, components B and C, that lie at an angular separation of 17.8 arc seconds. At the estimated distance of this system, this corresponds to a projected separation of around 1,150 AU.[6] The B/C pair consist of visual magnitude 10.5 and 10.8 stars with a mean separation of 0.3 arc seconds.[11] They have estimated mass of 90% and 95% that of the Sun, respectively.[6]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.