Xi Cassiopeiae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 00h 42m 03.892s[1] |
| Declination | +50° 30′ 45.12″[1] |
| Apparent magnitude (V) | +4.81[2] |
| Characteristics | |
| Spectral type | B2.5 V[3] or B3 IV[4] |
| U−B color index | −0.60[2] |
| B−V color index | −0.11[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.6±7.4[5] km/s |
| Proper motion (μ) | RA: +16.126 mas/yr[1] Dec.: −6.050 mas/yr[1] |
| Parallax (π) | 2.9022±0.2368 mas[1] |
| Distance | 1,120 ± 90 ly (340 ± 30 pc) |
| Absolute magnitude (MV) | −0.42[6] |
| Orbit[7] | |
| Period (P) | 940.2 d |
| Eccentricity (e) | 0.4 |
| Periastron epoch (T) | 2441738 JD |
| Argument of periastron (ω) (secondary) | 119° |
| Semi-amplitude (K1) (primary) | 11.90 km/s |
| Details | |
| Mass | 10.1±0.1[8] M☉ |
| Radius | 4.5[9] R☉ |
| Luminosity | 2,873[10] L☉ |
| Surface gravity (log g) | 3.571±0.032[11] cgs |
| Temperature | 15,585±250[11] K |
| Rotational velocity (v sin i) | 139±7[12] km/s |
| Age | 19[11] Myr |
| Other designations | |
| ξ Cas, 19 Cas, BD+49°164, FK5 2046, HD 3901, HIP 3300, HR 179, SAO 21637[13] | |
| Database references | |
| SIMBAD | data |
Xi Cassiopeiae is a blue-white hued binary star[7] system in the northern constellation of Cassiopeia. Its name is a Bayer designation that is Latinized from ξ Cassiopeiae, and abbreviated or ξ Cas. This system has an apparent visual magnitude of +4.81[2] and thus is faintly visible to the naked eye. Based upon an annual parallax shift of 2.90 mas as seen from Earth,[1] this system is located roughly 1,120 light-years (340 pc) from the Sun. At that distance, the visual magnitude of the system is diminished by an extinction factor of 0.20 due to interstellar dust.[6] It is advancing in the general direction of the Sun with a radial velocity of roughly −10.6 km/s.[5]
This is a single-lined spectroscopic binary star system with an orbital period of 940.2 days and an eccentricity of 0.4.[7] The visible component has the spectrum of a B-type main-sequence star with a stellar classification of B2.5 V.[3] It has an estimated 10.1[8] times the mass of the Sun and around 4.5[9] times the Sun's radius. At the age of 19[11] million years, it has a high rate of rotation with a projected rotational velocity of about 139 km/s.[12] The star is radiating 2,873[10] times the Sun's luminosity from its photosphere at an effective temperature of around 15,585 K.[11]
References
[edit | edit source]- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Gaia DR3 record for this source at VizieR.
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
