Ruprecht 171

(OCL 50; MWSC 2944)

0.95 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

0.87

C_lit

1.0

C_dup

N₅₀ (P>50% members) 1132

Stellar density (N₅₀/rad) 91.0 [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 0.87 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 171 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Relatively close Low extinction Massive Near-solar metallicity Old Contains BSS

Palma et al. (2025)
Classified as optical pair P451, along with HSC_195.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for Ruprecht 171 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–	278.009	-16.061	0.635	7.715	1.079	5.407
Bijavara Seshashayana et al.	2025	278.041	-15.879	–	–	–	–
Li et al.	2025	278.012	-16.062	0.62	7.677	1.091	–
Hu & Soubiran	2025	278.012	-16.074	–	–	–	–
Wei et al.	2025	278.009	-16.064	0.636	7.71	1.082	–
Carrasco-Varela et al.	2025	278.257	-16.076	–	–	–	–
Almeida et al.	2025	278.013	-16.066	–	–	–	–
Hunt & Reffert	2024	278.014	-16.061	0.636	7.717	1.083	5.555
Cavallo et al.	2024	278.013	-16.074	0.635	–	–	–
Hunt & Reffert	2023	278.014	-16.061	0.636	7.717	1.083	5.555
Almeida et al.	2023	278.005	-16.078	–	–	–	–
Angelo et al.	2023	278.012	-16.046	–	7.71	1.08	–
Tarricq et al.	2022	278.004	-16.06	0.633	7.709	1.086	–
Jadhav & Subramaniam	2021	278.012	-16.062	–	–	–	–
Dias et al.	2021	278.013	-16.066	0.622	7.678	1.091	5.884
Cantat-Gaudin et al.	2020	278.012	-16.062	0.62	7.677	1.091	–
Cantat-Gaudin & Anders	2020	278.012	-16.062	0.62	7.677	1.091	–
Soubiran et al.	2018	278.012	-16.062	–	–	–	5.61
Bica et al.	2019	278.04	-16.056	–	–	–	–
Cantat-Gaudin et al.	2018	278.012	-16.062	0.62	7.677	1.091	–
Tadross	2014	278.046	-16.05	–	–	–	–
Dias et al.	2014	278.046	-16.05	–	1.58	0.32	–
Dias et al.	2002	278.046	-16.05	–	1.58	0.32	–
Lynga	1987	278.045	-16.047	–	–	–	–

💡 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–	1.51	0.88	0.2	2958	0.019	2832	0.565	4
Bijavara Seshashayana et al.	2025	–	0.68	–	2750	0.000⁽¹⁴⁾	–	–	–
Li et al.	2025	1.51	0.88	–	2976	0.049	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.170⁽⁵⁾	–	–	–
Wei et al.	2025	1.35	0.42	–	4680	0.500	2978	0.49	–
Carrasco-Varela et al.	2025	1.51	0.93	–	2958	-0.100	–	–	4⁽¹⁾
Almeida et al.	2025	1.51	0.93	–	2958	–	2475	–	–
Hunt & Reffert	2024	–	–	–	–	–	3261⁽¹⁾	–	–
Cavallo et al.	2024	1.41	1.16	–	2344	-0.220	–	–	–
Hunt & Reffert	2023	1.49	0.81	0.20	1472	–	–	–	–
Almeida et al.	2023	1.47	0.93	–	3034	0.070	2687⁽¹⁾	0.64	–
Angelo et al.	2023	1.38	0.95	–	3162	0.000	35⁽¹⁾	–	–
Spina et al.	2022	–	–	–	–	0.038	–	–	–
Tarricq et al.	2022	1.48	–	–	2818	–	–	–	–
Jadhav & Subramaniam	2021	1.52	0.68	–	2754	–	5020	–	3⁽¹⁾
Dias et al.	2021	1.51	0.93	–	2958	0.048	–	–	–
Cantat-Gaudin et al.	2020	1.52	0.68	–	2754	–	–	–	–
Kounkel et al.	2020	1.64	1.25	–	1072	–	–	–	–
Cantat-Gaudin & Anders	2020	1.54	–	–	–	–	–	–	–
Soubiran et al.	2018	1.54	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.54	–	–	–	–	–	–	–
Tadross	2014	1.14	0.38	–	3200	–	–	–	–
Dias et al.	2002	1.14	0.38	–	3162	–	–	–	–

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

Visualization

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