Constellation Triangulum Australe (Southern Triangle)

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]}

Data for constellation Triangulum Australe ^[150]
IAU Name	Triangulum Australe
IAU Genitive	Trianguli Australis
IAU Abbr.	TrA
English Name	Southern Triangle
Season (47° N)	Not visible
Right Ascension	14^h 56^m 01^s … 17^h 13^m 53^s
Declination	-70° 30' 42" … -60° 15' 52"
Area	110 deg²
Neighbours (N↻)	Nor, Cir, Aps, Ara

History

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	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+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke ^[277]
Planetary Nebulae
Name	RA	Dec	Type	bMag	vMag	Dim	Dreyer Description	Identification, Remarks
NGC 5844	15 10 40.7	-64 40 22	PN	13.2		1.22	pB, pL, R, vgvlbM	PK 317-5.1, ESO 99-PN1, AM 1506-642
NGC 5979	15 47 41.1	-61 13 02	PN	11.8	11.5	0.3	!, planetary, pF, vS, R, r? am 150 st	PK 322-5.1, ESO 136-PN3, CS=13.1
Open Clusters
Name	RA	Dec	Type	bMag	vMag	Dim	Dreyer Description	Identification, Remarks
NGC 6025	16 03 17.7	-60 25 53	II2p		5.1	15	Cl, B, vL, pRi, lC, st 7…	OCL 939, ESO 136-SC14
Galaxies
Name	RA	Dec	Type	bMag	vMag	Dim	Dreyer Description	Identification, Remarks
NGC 5938	15 36 26.1	-66 51 33	SBbc	12.4	11.8	2.8 × 2.5	F, S, am st	ESO 99-7, AM 1531-664, IRAS 15317-6641
NGC 6156	16 34 52.6	-60 37 09	SBc	12.2	11.5	1.6 × 1.4	pF, pL, vlE, gbM	ESO 137-33, FAIR 329, IRAS 16304-6030
NGC 6183	16 41 41.8	-69 22 21	Sa	13.1	12.2	1.8 × 0.6	vF, eS, R, gbM	ESO 69-8
IC 4571	15 48 51.6	-67 19 25	SBb	13.4	12.6	1.4 × 0.5	cF, cS, mE 155°	ESO 99-11, IRAS 15440-6710
IC 4584	16 00 12.5	-66 22 57	Sc	15.8	15.1	1.8 × 1.5	eF, S, iF	ESO 100-4, AM 1555-661, IRAS 15554-6614
IC 4585	16 00 17.1	-66 19 21	SBb	13.0	12.3	2.6 × 0.8	eF, S, iF	ESO 100-5, AM 1555-661, IRAS 15555-6610
IC 4595	16 20 43.8	-70 08 33	Sc	12.7	12.0	2.7 × 0.5	F, S, eE 55°	ESO 69-2, IRAS 16153-7001

References

7	«Der grosse Kosmos-Himmelsführer» von Ian Ridpath und Wil Tirion; Kosmos Verlag; ISBN 3-440-05787-9
9	«Drehbare Sternkarte SIRIUS» von H. Suter-Haug; Hallwag-Verlag, Bern
15	«Hartung's Astronomical Objects for Southern Telescopes» by David Malin and David J. Frew; Melbourne University Press 1995; ISBN 0-522-84553-3
150	IAU: The Constellations, 11. Oktober 2020; iau.org/public/themes/constellations
154	Yale Bright Star Catalog, 15. Oktober 2020; tdc-www.harvard.edu/catalogs/bsc5.html
277	«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)

Constellation Triangulum Australe (Southern Triangle)

History

Catalogs

Yale Bright Star Catalogue

New General Catalogue and Index Catalogue of Nebulae and Star Clusters

References