NGC 6193

NGC 6193 (also known as Caldwell 82) is open cluster containing 27 stars in the constellation Ara, visible to the unaided eye.^[1] NGC 6193 lies at the center of the Ara OB1 association, which extends over a square degree. The cluster is associated with (and provides the energizing radiation for) neighboring regions of the nebulosity NGC 6188.

NGC 6193
NGC 6193 and the nebula NGC 6188
Observation data (J2000 epoch)
Right ascension	16h 41m 20s
Declination	−48° 45′ 48″
Distance	3765.3 ly (1155 pc)
Apparent magnitude (V)	5.2
Apparent dimensions (V)	15′
Physical characteristics
Estimated age	3 million years
Other designations	C 1637-486, Cl VDBH 195, OCl 975, Dun 413, Cr 310, ESO 226-SC020, Lund 716, h 3642, GC 4225, Caldwell 82
Associations
Constellation	Ara
See also: Open cluster, List of open clusters

Cluster members

NGC 6193 is dominated by two O class multiple star systems within 10" of each other at the centre of the cluster, and a probable binary B0 giant. There are at least 20 other early B stars in the cluster, of 9th and 10th magnitude.

#[2]	Name	Right ascension	Declination	mV	Spectral type	Comment
56	HD 150136	16h 41m 20.4149s	−48° 45′ 46.644″	5.62	O3−3.5 V + O5.5−6 V + O6.5−7 V[3]	Triple system
55	HD 150135	16h 41m 19.4537s	−48° 45′ 47.585″	6.89	O6.5V((f))z[4]	Binary[5]
45	HD 150041	16h 40m 44.5820s	−48° 45′ 22.214″	7.06	B0III	Variable[6]
37	HD 149834	16h 39m 30.6704s	−48° 51′ 02.511″	9.17	B2V	Binary?[6]
59	CD-48 11080	16h 41m 36.3084s	−48° 47′ 14.904″	10.32	B4V	[6]
	CD-48 11077	16h 41m 34.91s	−48° 46′ 24.2″	10.42	B2.5V	[6]
58	CD-48 11075	16h 41m 33.21s	−48° 45′ 06.6″	10.05[7]	B2.5V[5]
54	CD-48 11071	16h 41m 25.8569s	−48° 45′ 14.265″	8.45	B1V	Binary[6]
53	CD-48 11069	16h 41m 22.10s	−48° 44′ 57″	9.55	B1V	[6]
40	CD-48 11039	16h 40m 00.752s	−48° 47′ 02.41″	11.02[8]	B3V[5]
42	CD-48 11046	16h 40m 20.94s	−48° 54′ 56.2″	10.91[8]	B2.5V[5]
43	CD-48 11051	16h 40m 33.8837s	−48° 53′ 16.19″	10.39	B1h	[6]
	CD-48 11060	16h 40m 43s	−48° 48.8′	10.71	B3V	[6]
47	CD-48 11061	16h 40m 53.26s	−48° 45′ 35.2″	11.21[8]	B3.5V[5]	binary[5]
50	CD-48 11062	16h 41m 02.49s	−48° 53′ 49.7″	11.42[7]	B3.5V[5]
52	CD-48 11065	16h 41m 08.48s	−48° 52′ 21.6″	11.06[7]	B2.5V[5]	Wrongly cross-referenced to HD 150136 in Herbst[8]
57	CD-48 11076	16h 41m 33.0589s	−48° 33′ 59.651″	10.10	B2V	[6]
63	CD-48 11082	16h 41m 6.3148s	−48° 47′ 41.527″	10.38	B2V	[6]
65	CD-48 11086	16h 41m 54.83s	−48° 45′ 22.8″	10.38	B2.5V	[6]
66	CD-48 11088	16h 42m 00.47s	−48° 42′ 32.5″	10.05	B2.5V	[6]
67	CD-48 11090	16h 42m 05.69s	−48° 42′ 56.8″	10.59	B2.5V	[6]

Image gallery

• 
  Star cluster NGC 6193 and nebula NGC 6188.^[9]
• 
  Map showing the location of NGC 6193.