Trumpler 22

(Collinder 283; VDBH 161; MWSC 2226; OCL 920; vdBergh-Hagen 161; ESO 134 06)

0.96 UTI

0.79

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 215

Stellar density (N₅₀/rad) 31.7 [N/pc²]

C3 classification AA

C_N 0.79 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Trumpler 22 is a rich, very dense object of very 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, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~2.49 kpc) differs significantly from the median photometric distance (~1.80 kpc).

Relatively close Moderate extinction Massive Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P482, along with HSC_2649.

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg45' along with Hogg 17, NGC 5617 and Pismis 19.

Cavallo et al. (2024)
Gold sample.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.

Data

🔍 Search references for Trumpler 22 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–	217.796	-61.165	0.402	-5.142	-2.687	-40.732
Li et al.	2025	217.783	-61.169	0.386	-5.12	-2.683	–
Almeida et al.	2025	217.794	-61.155	–	–	–	–
Hunt & Reffert	2024	217.807	-61.182	0.41	-5.147	-2.688	-40.212
Cavallo et al.	2024	217.793	-61.17	0.41	–	–	–
Hunt & Reffert	2023	217.807	-61.182	0.41	-5.147	-2.688	-40.212
Just et al.	2023	217.72	-61.162	–	–	–	–
Dias et al.	2021	217.794	-61.155	0.386	-5.136	-2.713	-43.17
Cantat-Gaudin et al.	2020	217.783	-61.169	0.386	-5.12	-2.683	–
Cantat-Gaudin & Anders	2020	217.783	-61.169	0.386	-5.12	-2.683	–
Bossini et al.	2019	217.783	-61.169	–	–	–	–
Soubiran et al.	2018	217.783	-61.169	–	–	–	-43.03
Bica et al.	2019	217.743	-61.169	–	–	–	–
Cantat-Gaudin et al.	2018	217.783	-61.169	0.386	-5.12	-2.683	–
Loktin & Popova	2017	217.755	-61.168	–	-1.131	-4.299	-38.46
Kharchenko et al.	2016	217.72	-61.162	–	–	–	–
Dias et al.	2014	217.758	-61.167	–	-4.63	-4.9	–
Kharchenko et al.	2013	217.732	-61.165	–	-5.06	-4.2	–
Morales et al.	2013	217.758	-61.167	–	–	–	–
Piskunov et al.	2008	217.743	-61.169	–	–	–	–
van den Bergh	2006	217.75	-61.167	–	–	–	–
Kharchenko et al.	2005	217.75	-61.17	–	-5.05	-1.68	–
Kharchenko et al.	2003	217.78	-61.15	–	-5.71	-3.39	–
Dias et al.	2002	217.758	-61.167	–	-4.63	-4.9	-38.46

💡 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–	1.8	1.62	0.77	95	-0.060	1035	–	–
Li et al.	2025	2.11	1.86	–	122	0.158	–	–	–
Almeida et al.	2025	2.21	1.90	–	65	–	1035	–	–
Hunt & Reffert	2024	–	–	–	–	–	1830⁽¹⁾	–	–
Cavallo et al.	2024	1.80	1.71	–	398	-0.060	–	–	–
Hunt & Reffert	2023	2.27	1.76	0.77	95	–	–	–	–
Just et al.	2023	–	–	–	313	–	122	–	–
Dias et al.	2021	2.21	1.90	–	65	0.275	–	–	–
Cantat-Gaudin et al.	2020	2.44	1.78	–	32	–	–	–	–
Cantat-Gaudin & Anders	2020	2.41	–	–	–	–	–	–	–
Bossini et al.	2019	2.36	1.83	–	24	-0.170	–	–	–
Soubiran et al.	2018	2.41	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.41	–	–	–	–	–	–	–
Loktin & Popova	2017	1.53	1.59	–	95	–	–	–	–
Kharchenko et al.	2016	1.61	1.55	–	313	–	–	–	–
Kharchenko et al.	2013	1.61	1.55	–	313	–	–	–	–
Morales et al.	2013	1.52	–	–	89	–	–	–	–
Piskunov et al.	2008	1.52	1.61	–	129	–	–	–	–
van den Bergh	2006	1.52	1.61	–	89	–	–	–	–
Kharchenko et al.	2005	1.52	1.61	–	129	–	–	–	–
Kharchenko et al.	2003	1.52	1.61	–	–	–	–	–	–
Dias et al.	2002	1.52	1.62	–	89	-0.170	–	–	–

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

Visualization

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