Trumpler 17

(MWSC 1870)

0.90 UTI

0.82

C_N

1.0

C_dens

1.0

C_C3

0.84

C_lit

1.0

C_dup

N_m (P>50%) 284

Core radius and density 1.9 [pc], 8.6 [pc^-2]

C3 classification AA

C_N 0.82 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.84 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 17 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 well-studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P179, along with CWNU_2487.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.96 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0683, e_all=0.1168.

Data

🔍 Search references for Trumpler 17 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–	164.111	-59.229	0.382	-4.665	2.221	-1.284
Almeida et al.	2025	164.103	-59.227	–	–	–	–
Hunt & Reffert	2024	164.108	-59.229	0.389	-4.676	2.219	5.38
Celli et al.	2024	164.108	-59.23	–	–	–	–
Cavallo et al.	2024	164.114	-59.224	0.389	–	–	–
Hunt & Reffert	2023	164.108	-59.229	0.389	-4.676	2.219	5.38
Just et al.	2023	164.108	-59.219	–	–	–	–
Jaehnig et al.	2021	164.109	-59.234	0.404	-4.638	2.204	–
Rain et al.	2021	164.108	-59.23	0.375	-4.631	2.216	–
Dias et al.	2021	164.103	-59.227	0.384	-4.611	2.228	–
Cantat-Gaudin et al.	2020	164.108	-59.23	0.375	-4.631	2.216	–
Cantat-Gaudin & Anders	2020	164.108	-59.23	0.375	-4.631	2.216	–
Soubiran et al.	2018	164.108	-59.23	–	–	–	105.27
Cantat-Gaudin et al.	2018	164.108	-59.23	0.375	-4.631	2.216	–
Dias et al.	2018	–	–	–	-4.97	1.67	–
Loktin & Popova	2017	164.1	-59.223	–	-1.085	2.904	25.5
Sampedro et al.	2017	164.1	-59.2	–	0.28	0.24	–
Kharchenko et al.	2016	164.108	-59.219	–	–	–	–
Dias et al.	2014	164.1	-59.2	–	-0.11	0.86	30.93
Kharchenko et al.	2013	164.115	-59.223	–	-1.3	4.13	25.5
Piskunov et al.	2008	164.085	-59.195	–	–	–	–
Ahumada & Lapasset	2007	164.1	-59.2	–	–	–	–
van den Bergh	2006	164.1	-59.2	–	–	–	–
Kharchenko et al.	2005	164.1	-59.2	–	-2.2	5.7	–
Kharchenko et al.	2003	164.13	-59.21	–	-2.56	3.69	–
Dias et al.	2002	164.1	-59.2	–	-69.59	2.88	30.93
Lynga	1987	164.068	-59.213	–	–	–	–
van den Bergh & Hagen	1975	163.55	-58.95	–	–	–	–

💡 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–	2.25	1.895	2.61	51	0.205	808	–	0
Almeida et al.	2025	2.25	2.03	–	25	–	616	–	–
Hunt & Reffert	2024	2.36	1.94	2.61	52	–	2055⁽¹⁾	–	–
Celli et al.	2024	–	–	–	20	–	1001	–	–
Cavallo et al.	2024	2.63	2.10	–	50	0.370	–	–	–
Hunt & Reffert	2023	2.36	1.94	2.61	52	–	–	–	–
Just et al.	2023	–	–	–	60	–	232	–	–
Jaehnig et al.	2021	2.47⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.47	1.89	–	50	–	–	–	0
Dias et al.	2021	2.25	2.03	–	25	0.040	–	–	–
Cantat-Gaudin et al.	2020	2.70	1.84	–	20	–	–	–	–
Kounkel et al.	2020	2.68	1.86	–	117	–	–	–	–
Cantat-Gaudin & Anders	2020	2.47	–	–	–	–	–	–	–
Soubiran et al.	2018	2.47	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.47	–	–	–	–	–	–	–
Loktin & Popova	2017	2.21	1.90	–	53	–	–	–	–
Kharchenko et al.	2016	2.19	1.84	–	60	–	–	–	–
Kharchenko et al.	2013	2.19	1.84	–	60	–	–	–	–
Piskunov et al.	2008	2.19	1.89	–	32	–	–	–	–
Ahumada & Lapasset	2007	–	1.92	–	51	–	–	–	0
van den Bergh	2006	2.19	1.89	–	51	–	–	–	–
Kharchenko et al.	2005	2.19	1.89	–	32	–	–	–	–
Kharchenko et al.	2003	2.17	1.89	–	–	–	–	–	–
Dias et al.	2002	2.19	1.91	–	51	–	–	–	–
Lynga	1987	1.40	2.02	–	35	–	–	–	–

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

Visualization

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