Trumpler 1

(Collinder 15; MWSC 127; OCL 328; FSR 0552)

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) 219

Stellar density (N₅₀/rad) 21.3 [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 1 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 near-solar metallicity, young 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.

Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Trumpler 1 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–	23.909	61.286	0.354	-1.635	-0.576	–
Li et al.	2025	23.915	61.283	0.348	-1.598	-0.541	–
Almeida et al.	2025	23.923	61.285	–	–	–	–
Hunt & Reffert	2024	23.916	61.284	0.355	-1.645	-0.584	–
Celli et al.	2024	23.915	61.283	–	–	–	–
Cavallo et al.	2024	23.856	61.282	0.355	–	–	–
Hunt & Reffert	2023	23.916	61.284	0.355	-1.645	-0.584	–
Almeida et al.	2023	23.918	61.287	–	–	–	–
Just et al.	2023	23.899	61.272	–	–	–	–
Jaehnig et al.	2021	23.913	61.287	0.388	-1.612	-0.525	–
Rain et al.	2021	23.915	61.283	0.348	-1.598	-0.541	–
Dias et al.	2021	23.923	61.285	0.347	-1.609	-0.539	–
Cantat-Gaudin et al.	2020	23.915	61.283	0.348	-1.598	-0.541	–
Cantat-Gaudin & Anders	2020	23.915	61.283	0.348	-1.598	-0.541	–
Bossini et al.	2019	23.915	61.283	–	–	–	–
Bica et al.	2019	23.9	61.298	–	–	–	–
Cantat-Gaudin et al.	2018	23.915	61.283	0.348	-1.598	-0.541	–
Loktin & Popova	2017	23.925	61.284	–	-0.5	-0.812	-65.0
Kharchenko et al.	2016	23.899	61.272	–	–	–	–
Dias et al.	2014	23.925	61.283	–	-3.31	-1.02	–
Kharchenko et al.	2013	23.91	61.275	–	0.67	-2.16	-65.0
Gozha et al.	2012	23.925	61.283	–	–	–	–
Kharchenko et al.	2012	23.91	61.275	–	0.67	-2.16	-65.0
Kharchenko et al.	2007	23.92	61.28	–	0.03	–	–
van den Bergh	2006	23.925	61.283	–	–	–	–
Dias et al.	2002	23.925	61.283	–	-3.31	-1.02	-65.0
Dambis	1999	23.925	61.283	–	–	–	–

💡 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–	2.57	1.805	1.03	26	-0.025	557	0.64	0.0
Li et al.	2025	2.54	1.75	–	47	-0.039	–	–	–
Almeida et al.	2025	2.42	1.84	–	22	–	345	–	–
Hunt & Reffert	2024	–	–	–	–	–	897⁽¹⁾	–	–
Celli et al.	2024	–	–	–	29	–	572	–	–
Cavallo et al.	2024	3.16	1.62	–	40	0.720	–	–	–
Hunt & Reffert	2023	2.63	1.63	1.03	28	–	–	–	–
Almeida et al.	2023	2.42	1.81	–	26	-0.046	557⁽¹⁾	0.64	–
Just et al.	2023	–	–	–	13	–	24	–	–
Jaehnig et al.	2021	2.58⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.65	2.11	–	20	–	–	–	0
Dias et al.	2021	2.42	1.84	–	22	-0.012	–	–	–
Cantat-Gaudin et al.	2020	2.78	1.63	–	29	–	–	–	–
Cantat-Gaudin & Anders	2020	2.65	–	–	–	–	–	–	–
Bossini et al.	2019	3.30	1.78	–	33	0.000	–	–	–
Cantat-Gaudin et al.	2018	2.65	–	–	–	–	–	–	–
Loktin & Popova	2017	2.58	1.79	–	30	–	–	–	–
Kharchenko et al.	2016	2.40	1.81	–	13	–	–	–	–
Kharchenko et al.	2013	2.40	1.81	–	13	–	–	–	–
Gozha et al.	2012	2.56	–	–	40	-0.710	–	–	–
Kharchenko et al.	2012	2.40	1.81	–	13	–	–	–	–
van den Bergh	2006	2.56	1.80	–	30	–	–	–	–
Dias et al.	2002	2.47	2.11	–	20	–	–	–	–
Dambis	1999	2.69	1.64	–	25	–	–	–	–

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

Visualization

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