The constellation is small but noticeable at 110 square degrees, because the equilateral triangle is formed by three stars of the 2nd and 3rd magnitude. It is to the east of the two front cataracts of the Centaurs. The center of the constellation culminates around midnight on May 22nd. [9, 15]
The constellation was introduced in 1603 by Johann Bayer as a southern counterpart to the long-known triangulum in his Uranometria. It was proposed by Pieter Theodor a century earlier. [7]
Catalogs
Yale Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) [154]
HR
B
F
RA [hms]
Dec [dms]
vMag
spType
dMag
Sep ["]
5671
γ
15 18 54.6
-68 40 46
2.89
A1V
5771
ε
15 36 43.2
-66 19 01
4.11
K1-2III
5.4
83.2
5891
κ
15 55 29.6
-68 36 11
5.09
G5IIa
5897
β
15 55 08.5
-63 25 50
2.85
F2III
11.0
155.
6030
δ
16 15 26.3
-63 41 08
3.85
G2Ib-IIa
8.0
30.
6098
ζ
16 28 28.1
-70 05 04
4.91
F9V
6109
ι
16 27 57.3
-64 03 29
5.27
F4IV
4.1
19.6
6151
θ
16 35 44.8
-65 29 43
5.52
G8-K0III
6172
η1
16 41 23.3
-68 17 46
5.91
B7IVe
6217
α
16 48 39.9
-69 01 40
1.92
K2IIb-IIIa
«Revised New General Catalogue and Index Catalogue», Dr. Wolfgang Steinicke, 2021 [277]
