Ruprecht 172

(MWSC 3276; OCL 151)

0.89 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

0.84

C_lit

1.0

C_dup

N_m (P>50%) 119

Core radius and density 1.5 [pc], 6.7 [pc^-2]

C3 classification AA

C_N 0.76 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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Ruprecht 172 is a 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, 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.

Distant Moderate extinction Massive Near-solar metallicity Old Contains BSS

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: 0.91 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.91 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1481, e_all=0.0958.

Data

🔍 Search references for Ruprecht 172 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–	302.889	35.604	0.257	-2.023	-3.709	12.686
Li et al.	2025	302.888	35.603	0.259	-2.034	-3.668	–
Hu & Soubiran	2025	302.888	35.608	–	–	–	–
Almeida et al.	2025	302.888	35.606	–	–	–	–
Hunt & Reffert	2024	302.887	35.602	0.254	-2.032	-3.714	9.226
Cavallo et al.	2024	302.888	35.608	0.254	–	–	–
Hunt & Reffert	2023	302.887	35.602	0.254	-2.032	-3.714	9.226
Just et al.	2023	302.95	35.662	–	–	–	–
Jadhav & Subramaniam	2021	302.888	35.603	–	–	–	–
Dias et al.	2021	302.888	35.606	0.257	-2.053	-3.659	11.451
Cantat-Gaudin et al.	2020	302.888	35.603	0.259	-2.034	-3.668	–
Sánchez et al.	2020	302.9	35.605	–	-2.082	-3.621	–
Cantat-Gaudin & Anders	2020	302.888	35.603	0.259	-2.034	-3.668	–
Soubiran et al.	2018	302.888	35.603	–	–	–	15.35
Bica et al.	2019	302.924	35.629	–	–	–	–
Cantat-Gaudin et al.	2018	302.888	35.603	0.259	-2.034	-3.668	–
Dias et al.	2018	–	–	–	-2.15	-4.39	–
Dib et al.	2018	302.955	35.665	–	–	–	–
Sampedro et al.	2017	302.9	35.605	–	-2.91	-4.21	–
Kharchenko et al.	2016	302.95	35.662	–	–	–	–
Dias et al.	2014	302.9	35.605	–	-2.55	-4.58	–
Kharchenko et al.	2013	302.955	35.665	–	-3.97	-2.72	–
Bukowiecki et al.	2011	302.892	35.596	–	–	–	–
Piskunov et al.	2008	302.886	35.601	–	–	–	–
Kharchenko et al.	2005	302.89	35.6	–	-0.42	-3.97	–
Dias et al.	2002	302.9	35.605	–	-2.55	-4.58	–
Lynga	1987	302.924	35.629	–	–	–	–

💡 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–	3.16	1.29	1.52	1122	-0.081	1029	–	3
Li et al.	2025	3.22	1.79	–	1205	-0.046	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200⁽⁵⁾	–	–	–
Almeida et al.	2025	3.16	1.90	–	1175	–	699	–	–
Hunt & Reffert	2024	3.68	2.12	1.52	576	–	1057⁽¹⁾	–	–
Cavallo et al.	2024	2.84	1.79	–	1380	0.170	–	–	–
Hunt & Reffert	2023	3.68	2.12	1.52	575	–	–	–	–
Just et al.	2023	–	–	–	1161	–	202	–	–
Jadhav & Subramaniam	2021	3.56	1.29	–	1047	–	1029	–	3⁽¹⁾
Dias et al.	2021	3.16	1.90	–	1175	-0.115	–	–	–
Cantat-Gaudin et al.	2020	3.56	1.29	–	1047	–	–	–	–
Kounkel et al.	2020	3.53	2.32	–	427	–	–	–	–
Cantat-Gaudin & Anders	2020	3.47	–	–	–	–	–	–	–
Soubiran et al.	2018	3.47	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.47	–	–	–	–	–	–	–
Dib et al.	2018	1.80	–	–	1161	–	–	–	–
Kharchenko et al.	2016	1.80	1.18	–	1161	–	–	–	–
Kharchenko et al.	2013	1.80	1.18	–	1161	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	2812	–	–
Bukowiecki et al.	2011	2.97⁽¹⁾	1.23	–	1122	–	–	–	–
Piskunov et al.	2008	1.10	0.63	–	813	–	–	–	–
Kharchenko et al.	2005	1.10	0.63	–	813	–	–	–	–
Dias et al.	2002	1.10	0.63	–	813	–	–	–	–

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

Visualization

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