Ruprecht 109

(VDBH 156; NGC 5381; MWSC 2196; OCL 915; vdBergh-Hagen 156; ESO 133 11)

1.0 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 697

Stellar density (N₅₀/rad) 38.3 [N/pc²]

C3 classification AA

C_N 1.0 Very 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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Ruprecht 109 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, 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 very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Massive 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 Ruprecht 109 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–	210.222	-59.576	0.389	-6.062	-2.924	-38.09
Li et al.	2025	210.205	-59.578	0.379	-6.034	-2.932	–
Hu & Soubiran	2025	210.226	-59.581	–	–	–	–
Almeida et al.	2025	210.196	-59.582	–	–	–	–
Hunt & Reffert	2024	210.22	-59.578	0.39	-6.073	-2.919	-29.414
Cavallo et al.	2024	210.226	-59.581	0.39	–	–	–
Hunt & Reffert	2023	210.22	-59.578	0.39	-6.073	-2.919	-29.414
Just et al.	2023	210.153	-59.602	–	–	–	–
Dias et al.	2021	210.196	-59.582	0.379	-6.034	-2.921	-38.379
Cantat-Gaudin et al.	2020	210.205	-59.578	0.379	-6.034	-2.932	–
Sánchez et al.	2020	210.171	-59.587	–	-6.161	-2.888	–
Cantat-Gaudin & Anders	2020	210.205	-59.578	0.379	-6.034	-2.932	–
Soubiran et al.	2018	210.205	-59.578	–	–	–	-38.61
Bica et al.	2019	210.151	-59.594	–	–	–	–
Cantat-Gaudin et al.	2018	210.205	-59.578	0.379	-6.034	-2.932	–
Kharchenko et al.	2016	210.153	-59.602	–	–	–	–
Dias et al.	2014	210.171	-59.587	–	-1.77	-4.92	–
Kharchenko et al.	2013	210.165	-59.605	–	-5.45	0.7	–
Dias et al.	2002	210.171	-59.587	–	-1.77	-4.92	–

💡 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–	2.33	1.61	1.58	447	0.187	2055	–	–
Li et al.	2025	2.34	1.47	–	533	0.254	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.160⁽⁵⁾	–	–	–
Almeida et al.	2025	2.07	1.61	–	504	–	2055	–	–
Hunt & Reffert	2024	–	–	–	–	–	4167⁽¹⁾	–	–
Cavallo et al.	2024	2.02	1.53	–	646	0.220	–	–	–
Hunt & Reffert	2023	2.32	1.63	1.58	253	–	–	–	–
Just et al.	2023	–	–	–	447	–	218	–	–
Dias et al.	2021	2.07	1.61	–	504	0.154	–	–	–
Cantat-Gaudin et al.	2020	2.34	1.62	–	355	–	–	–	–
Cantat-Gaudin & Anders	2020	2.45	–	–	–	–	–	–	–
Soubiran et al.	2018	2.45	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.45	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.95	1.94	–	447	–	–	–	–
Kharchenko et al.	2013	1.95	1.94	–	447	–	–	–	–
Dias et al.	2002	2.63	1.43	–	251	–	–	–	–

(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 0605	3.6	210.32	-59.58	0.46	-6.03	-2.9	-40.33	0.0

💡 Note: The % column shows the percentage of members that Ruprecht 109 shares with each listed object.

Visualization

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