Y Sagittarii
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 21m 22.98643s[2] |
Declination | −18° 51′ 36.0018″[2] |
Apparent magnitude (V) | 5.76[3] |
Characteristics | |
Spectral type | F8 II[4] |
B−V color index | 0.67±0.02[3] |
Variable type | Cepheid variable[4] |
Absolute magnitude (MV) | −2.06[3] |
Details | |
Myr | |
HR 6863[7] | |
Database references | |
SIMBAD | data |
Y Sagittarii is a variable star in the constellation of Sagittarius. It is a Cepheid variable with an apparent magnitude that ranges around +5.77. The measure of its parallax by Hubble Space Telescope puts Y Sagittarii to 1,293 light-years away from the Solar System.
The brightness ranges in Y Sagittarii's apparent magnitude varies from +5.25 and +6.24 in a period of 5.7736 days. The spectral type of this star is F8II, while the effective temperature is 5370 K. It has a radius 50 times larger than the Sun, while its projected rotational velocity of 16 km / s and it has an estimated mass six times that of the Sun. The star's metal content is similar to Sun, with an index of metallicity [Fe / H] = +0.05. For other metals tested, it shows some overabundance of copper, zinc, yttrium and sodium; the level of the elements is almost double that of the Sun ([Na / H] = +0.27).[8]
There is evidence that Y Sagittarii may be a
References
- ^ "Light Curve". Hipparcos ESA. ESA. Retrieved 17 February 2022.
- ^ S2CID 18759600.
- ^ S2CID 119257644.
- ^ S2CID 121213614.
- S2CID 118432032.
- ^ "HIP 89968", Wolfram Alpha, retrieved 2012-09-17.
- ^ "V* Y Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-09-17.
- doi:10.1086/142708.
- S2CID 223953710, 81.