Xi Serpentis
| Observation data ICRS )
| ||
|---|---|---|
| Constellation | Serpens | |
| Right ascension | 17h 37m 35.19983s[1] | |
| Declination | −15° 23′ 54.7940″[1] | |
| Apparent magnitude (V) | 3.54[2] | |
| Characteristics | ||
| Spectral type | A9 IIIp Sr[3] | |
| U−B color index | +0.12[2] | |
| B−V color index | +0.27[2] | |
| Absolute magnitude (MV) | +1.00[5] | |
Semi-amplitude (K1)(primary) | 19.4 km/s | |
| Details | ||
| ξ Ser Aa | ||
Gyr | ||
| ξ Ser Ab | ||
| Mass | 0.18[10] M☉ | |
| Database references | ||
| SIMBAD | data | |
Xi Serpentis,
perihelion passage at a distance of 27 ly (8.2 pc) in around 690,000 years.[12]
The inner pair form a single-lined
Ap star with an abnormal abundance of strontium. The primary has around double[7] the mass of the Sun, while its close companion, component Ab,[13] has only 18%[10]
of the Sun's mass.
The third member, component B, is a magnitude 13.0arc seconds along a position angle of 78° from the inner pair.[13] It has about 27% of the Sun's mass and an estimated orbital period of 14,763 years.[10]
Name
In
Chinese name for ξ Serpentis itself is Tiān Shì Zuǒ Yuán shí (天市左垣十, English: the Tenth Star of Left Wall of Heavenly Market Enclosure), representing the region of Nanhai (南海, lit. meaning southern sea)[15][16]
References
- ^ S2CID 18759600.
- ^ Bibcode:1986EgUBV........0M.
- ^ S2CID 119476992.
- S2CID 59451347, A61.
- S2CID 119257644.
- ^ S2CID 119387088.
- ^ S2CID 118505114.
- S2CID 118665352.
- S2CID 14070763.
- ^ S2CID 8899546.
- ^ "ksi Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-23.
{{cite web}}: CS1 maint: postscript (link) - S2CID 59039482, A35.
- ^ doi:10.1086/323920.
- ISBN 978-986-7332-25-7.
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 23 日
- ^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived August 10, 2010, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.