Alpha Lacertae
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Alpha Lacertae, Latinised from α Lacertae, also named Stellio,[9] is a single[10] white-hued star in the constellation of Lacerta,[8] located 103[1] light-years from the Sun. It is the brightest star in Lacerta with an apparent visual magnitude of 3.76.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −4.5 km/s.[5]
This is an ordinary A-type main-sequence star with a stellar classification of A1 V,[3] which indicates it is generating energy through hydrogen fusion at its core. It is around 400[6] million years old with a relatively high rate of spin, showing a projected rotational velocity of 128 km/s.[7] The star has 2.2 times the mass of the Sun and 2.1 times the Sun's radius. It is radiating 28 times the Sun's luminosity from its photosphere at an effective temperature of Script error: No such module "val"..[6]
Alpha Lacertae has a visual companion, CCDM J22313+5017B, of spectral type A and apparent visual magnitude 11.8, approximately 36 arcseconds away.[11] The companion is optical, a chance line-of-sight coincidence.[4]
Naming
Alpha Lacertae is the Bayer designation for this star; it has the Flamsteed designation 7 Lacertae. In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Flying Serpent, refers to an asterism consisting of α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae, and ψ Andromedae. Consequently, the Chinese name for α Lacertae itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[12]
The IAU Working Group on Star Names approved the name Stellio for this star on 29 August 2024 and it is now so entered in the IAU Catalog of Star Names.[9] Stellio is an obsolete historical name for the constellation Lacerta, named after the lizard Laudakia stellio, the starred agama or stellion.[13]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c HR 8585, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 3, 2008.
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1". See Table 3.
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Template:Cite simbad
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Entry 22313+5017, discoverer code BU 703, The Washington Double Star Catalog Template:Webarchive, United States Naval Observatory. Accessed on line September 3, 2008.
- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日 Template:Webarchive
- ↑ Script error: No such module "citation/CS1".
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External links
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