Trumpler 12

(Collinder 217; VDBH 89; MWSC 1763; OCL 803; vdBergh-Hagen 89; ESO 127 07; FSR 1537; FoF 63)

0.97 UTI

0.84

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 345

Radius (P>50% members) 3.1 [arcmin]

C_N 0.84 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 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Trumpler 12 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

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

Distant Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Trumpler 12 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	–	151.624	-60.29	0.267	-6.898	4.468	23.179
Li et al.	2025	151.621	-60.29	0.253	-6.913	4.463	–
Hu & Soubiran	2025	151.616	-60.289	–	–	–	–
Almeida et al.	2025	151.622	-60.29	–	–	–	–
Hunt & Reffert	2024	151.624	-60.295	0.273	-6.891	4.471	24.729
Cavallo et al.	2024	151.616	-60.289	0.27	–	–	–
Hunt & Reffert	2023	151.624	-60.295	0.273	-6.891	4.471	24.729
Almeida et al.	2023	151.624	-60.291	–	–	–	–
Just et al.	2023	151.629	-60.297	–	–	–	–
Dias et al.	2021	151.622	-60.29	0.255	-6.916	4.467	33.545
Cantat-Gaudin et al.	2020	151.621	-60.29	0.253	-6.913	4.463	–
Sánchez et al.	2020	151.621	-60.3	–	-6.861	4.452	–
Cantat-Gaudin & Anders	2020	151.621	-60.29	0.253	-6.913	4.463	–
Liu & Pang	2019	151.62	-60.296	0.257	-6.886	4.404	–
Bossini et al.	2019	151.621	-60.29	–	–	–	–
Soubiran et al.	2018	151.621	-60.29	–	–	–	36.74
Bica et al.	2019	151.618	-60.289	–	–	–	–
Cantat-Gaudin et al.	2018	151.621	-60.29	0.253	-6.913	4.463	–
Kharchenko et al.	2016	151.629	-60.297	–	–	–	–
Dias et al.	2014	151.621	-60.3	–	-3.82	1.75	–
Kharchenko et al.	2013	151.635	-60.3	–	-9.23	3.05	–
Piskunov et al.	2008	151.606	-60.297	–	–	–	–
Kharchenko et al.	2005	151.62	-60.3	–	-9.08	2.23	–
Kharchenko et al.	2003	151.6	-60.27	–	-8.1	3.64	–
Dias et al.	2002	151.621	-60.3	–	-3.82	1.75	–

💡 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]	Bfr	BSS
Li et al.	2025	3.13	0.64	–	850	-0.050	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.300*	–	–	–
Almeida et al.	2025	3.21	0.59	–	836	–	963	–	–
Hunt & Reffert	2024	–	–	–	–	–	1884*	–	–
Cavallo et al.	2024	2.45	0.84	–	1202	-0.420	–	–	–
Hunt & Reffert	2023	3.25	0.40	0.92	865	–	–	–	–
Almeida et al.	2023	3.12	0.78	–	778	-0.020	711*	0.54	–
Just et al.	2023	–	–	–	1603	–	148	–	–
Dias et al.	2021	3.21	0.59	–	836	0.053	–	–	–
Cantat-Gaudin et al.	2020	3.31	0.49	–	661	–	–	–	–
Cantat-Gaudin & Anders	2020	3.55	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	955	0.000	–	–	–
Bossini et al.	2019	3.26	0.57	–	791	0.000	–	–	–
Soubiran et al.	2018	3.55	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.55	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.44	0.16	–	1603	–	–	–	–
Kharchenko et al.	2013	1.44	0.16	–	1603	–	–	–	–
Piskunov et al.	2008	1.30	0.16	–	646	–	–	–	–
Kharchenko et al.	2005	1.30	0.16	–	646	–	–	–	–
Kharchenko et al.	2003	1.25	0.62	–	–	–	–	–	–
Dias et al.	2002	1.30	0.16	–	646	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0538	16.2	151.64	-60.28	0.28	-6.9	4.49	24.17	0.0

💡 Note: The % column shows the percentage of members that Trumpler 12 shares with each listed object.

Visualization

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