Υ Coronae Borealis
Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary[10] star in the northern constellation of Corona Borealis. It is a white-hued star that is dimly visible to the naked eye wit…
Read more »Υ3 Eridani
For other star systems with this Bayer designation, see Upsilon Eridani. Upsilon³ Eridani (υ³ Eridani, abbreviated Upsilon³ Eri, υ³ Eri), officially named Beemim /ˈ b iː m ə m / ,[10] is a star in the…
Read more »Τ Persei
Tau Persei (τ Per), also known as 18 Persei, is a binary star in the constellation of Perseus. The system is fairly close, and is located about 254 light-years (78 parsecs) away, based on its parallax…
Read more »Τ Scorpii
Tau Scorpii, Latinized from τ Scorpii, formally known as Paikauhale /ˌ p aɪ k aʊ ˈ h ɑː l eɪ / , is a star in the southern zodiac constellation of Scorpius. The apparent visual magnitude of Tau Scorpi…
Read more »Τ Ophiuchi
Tau Ophiuchi (τ Oph) is a multiple star in the constellation Ophiuchus, approximately 167 light years away based on parallax.[1] Its two main components are two yellow-white main sequence stars, A, of…
Read more »Τ Aquilae
Tau Aquilae, Latinized from τ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. The apparent visual magnitude of 5.7[2] indicates it is a faint star that is visib…
Read more »Τ1 Hydrae
For other stars with this Bayer designation, see τ Hydrae. Tau1 Hydrae is a triple star[3] system in the equatorial constellation of Hydra. Based upon the annual parallax shift of the two visible comp…
Read more »Τ4 Serpentis
For other stars with this Bayer designation, see Tau Serpentis. Tau4 Serpentis, Latinized from τ4 Serpentis, is a variable M-type giant star in the constellation of Serpens, approximately 710 light-ye…
Read more »Σ Persei
Sigma Persei (Sigma Per, σ Persei, σ Per) is an orange K-type giant[3] with an apparent magnitude of +4.36.[2] It is approximately 360 light years from Earth.[1]σ PerseiLocation of σ Persei (circled)O…
Read more »Σ-compact space
In mathematics, a topological space is said to be σ-compact if it is the union of countably many compact subspaces.[1] A space is said to be σ-locally compact if it is both σ-compact and (weakly) loca…
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