Collinder 228

Collinder 228 is an open cluster within the southern part of the Carina Nebula NGC 3372, about 25' south of η Carinae.^[2] It is probably composed of stars which recently formed from the material in the nebula. QZ Carinae is the brightest member of Collinder 228 with an apparent magnitude between 6.16–6.49.^[3]

Prominent stars in Collinder 228

Star name	FMF number	Effective temperature	Absolute magnitude	Bolometric magnitude	Mass (M☉)	Spectral type	Ref.
WR 24 (HD 93131)	3	50100	−7.34	−11.4	114	WN6ha-w	[4]
QZ Car (HD 93206)	33	30400 + 20000 + 34000 + 32900	−9.2 + 3 + 8.5 + 7	−10.6	27.1 + 6.5 + 25.4 + 17.1	O9.7I + B2V + O8III + O9V	[5][6][7]
HD 93632	92	45400	−6.1	−10.2	76	O5III(f)	[7]
V661 Car (HD 93130)	1	39900	−6.3	−10.1	68	O7II(f)	[7]
HD 305525	98	43600	−5.7	−9.8	58	O6V	[7]
	97	46100	−4.8	−9	47	O5V	[7]
HD 93146		42400	−5.1	−9.1	44	O6.5V((f))	[7]
HD 305524	7	41000	−5.2	−9.1	42	O7V((f))	[7]
HD 93222	6	37200	−5.7	−9.3	42	O8III((f))	[7]
HD 305523	32	35700	−5.6	−9.1	38	O8.5III	[7]
HD 305532	38	43600	−4.4	−8.5	38	O6V((f))	[7]
HD 305438	24	38500	−4.6	−8.4	32	O8V	[7]
HD 93028	27	35700	−4.9	−8.4	30	O8.5III	[7]
HD 305518	22	34700	−5	−8.3	29	O9.5V	[7]
HD 93027	14	36000	−4.8	−8.3	29	O9V	[7]
	39	37200	−4.6	−8.2	29	O8.5V((f))	[7]
HD 305539	94	37200	−4.4	−8.1	28	O8.5V	[7]
	67	36000	−4.7	−8.2	28	O9V	[7]
HD 93576	93	36000	−4.7	−8.2	28	O9V	[7]
	21	37200	−4.2	−7.8	27	O8.5V	[7]
HD 305536	5	34700	−4.7	−8.1	26	O9.5V	[7]
	66	34700	−3.9	−7.3	22	O9.5V	[7]
	12	20900	−6.1	−8	20	B2.5Ia:	[7]

Collinder 228
Observation data (J2000 epoch)
Right ascension	10h 44m 00.0s[1]
Declination	−60° 05′ 12″[1]
Distance	10,000 ly
Apparent magnitude (V)	4.4[1]
Apparent dimensions (V)	14
Physical characteristics
Other designations	OCl 828.0, MWSC 1845, C 1041-597, KPR2004b 262[1]
Associations
Constellation	Carina
See also: Open cluster, List of open clusters

See also

• List of most massive stars