Collinder 228

0.69 UTI

0.62

C_N

1.0

C_dens

0.75

C_C3

0.53

C_lit

1.0

C_dup

N₅₀ (P>50% members) 75

Stellar density (N₅₀/rad) 11.5 [N/pc²]

C3 classification AB

C_N 0.62 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.53 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Collinder 228 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Very young

Palma et al. (2025)
Part of multiple system G21, along with Trumpler_16, ASCC_62, Gulliver_52 and NGC_3496.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for Collinder 228 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	161.009	-60.09	0.399	-6.698	1.921	-11.487
Hunt & Reffert	2024	161.011	-60.091	0.399	-6.668	1.92	-28.406
Cavallo et al.	2024	161.013	-60.081	0.399	–	–	–
Hunt & Reffert	2023	161.011	-60.091	0.399	-6.668	1.92	-28.406
Loktin & Popova	2017	160.995	-60.087	–	-6.55	2.03	-13.5
Dias et al.	2014	161.0	-60.087	–	-6.31	0.12	–
Gozha et al.	2012	161.0	-60.087	–	–	–	–
Piskunov et al.	2008	160.939	-60.085	–	–	–	–
Kharchenko et al.	2007	160.99	-60.09	–	0.35	–	-13.46
Ahumada & Lapasset	2007	160.525	-59.917	–	–	–	–
van den Bergh	2006	160.95	-60.083	–	–	–	–
Kharchenko et al.	2005	160.95	-60.09	–	-6.66	1.93	-13.46
Kharchenko et al.	2003	160.99	-60.09	–	-6.3	2.67	–
Chen et al.	2003	160.749	-59.966	–	-6.55	2.03	-12.0
Dias et al.	2002	161.0	-60.087	–	-6.55	2.03	-10.71
Dambis	1999	161.0	-60.087	–	–	–	–
Lynga	1987	160.755	-60.002	–	–	–	–

💡 Note: The UCC values are estimated from its identified members.

Reference	Year	Dist [kpc]	Av [mag]	DAv [mag]	Age [Myr]	[Fe/H] [dex]	Mass [Msun]	B_frac	BSS
UCC	99999–	2.2	1.05	1.06	6	-0.140	2975	–	0
Hunt & Reffert	2024	–	–	–	–	–	327⁽¹⁾	–	–
Cavallo et al.	2024	1.91	0.58	–	59	-0.140	–	–	–
Hunt & Reffert	2023	2.32	0.96	1.06	5	–	–	–	–
Loktin & Popova	2017	1.91	1.07	–	7	–	–	–	–
Gozha et al.	2012	2.20	–	–	7	–	5623	–	–
Piskunov et al.	2008	1.91	0.82	–	5	–	–	–	–
Ahumada & Lapasset	2007	–	1.07	–	7	–	–	–	0
van den Bergh	2006	2.20	1.07	–	7	–	–	–	–
Kharchenko et al.	2005	1.91	0.82	–	5	–	–	–	–
Kharchenko et al.	2003	2.22	0.95	–	–	–	–	–	–
Chen et al.	2003	2.20	–	–	0	–	–	–	–
Dias et al.	2002	2.20	1.08	–	7	–	–	–	–
Dambis	1999	2.29	1.05	–	3	–	–	–	–
Lynga	1987	2.60	1.51	–	1	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0550	33.3	161.01	-60.1	0.4	-6.61	1.9	-28.44	0.0

💡 Note: The % column shows the percentage of members that Collinder 228 shares with each listed object.

Visualization

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