Ruprecht 164

(VDBH 119; MWSC 1951; OCL 858; vdBergh-Hagen 119; ESO 129 23; FSR 1588)

0.89 UTI

0.78

C_N

1.0

C_dens

1.0

C_C3

0.84

C_lit

1.0

C_dup

N_m (P>50%) 190

Core radius and density 1.3 [pc], 7.3 [pc^-2]

C3 classification AA

C_N 0.78 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 164 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 low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, 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 Low extinction Near-solar metallicity Intermediate age 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: 0.81 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.81 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0979, e_all=0.1433.

Data

🔍 Search references for Ruprecht 164 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–	172.608	-60.75	0.209	-6.854	1.35	0.76
Li et al.	2025	172.616	-60.752	0.194	-6.83	1.321	–
Hu & Soubiran	2025	172.624	-60.753	–	–	–	–
Almeida et al.	2025	172.644	-60.754	–	–	–	–
Hunt & Reffert	2024	172.606	-60.746	0.207	-6.856	1.38	-0.689
Cavallo et al.	2024	172.624	-60.753	0.209	–	–	–
Hunt & Reffert	2023	172.606	-60.746	0.207	-6.856	1.38	-0.689
Just et al.	2023	172.703	-60.746	–	–	–	–
Jadhav & Subramaniam	2021	172.616	-60.752	–	–	–	–
Dias et al.	2021	172.644	-60.754	0.194	-6.829	1.317	–
Cantat-Gaudin et al.	2020	172.616	-60.752	0.194	-6.83	1.321	–
Cantat-Gaudin & Anders	2020	172.616	-60.752	0.194	-6.83	1.321	–
Soubiran et al.	2018	172.616	-60.752	–	–	–	7.91
Bica et al.	2019	172.632	-60.734	–	–	–	–
Cantat-Gaudin et al.	2018	172.616	-60.752	0.194	-6.83	1.321	–
Dias et al.	2018	–	–	–	-6.91	0.71	–
Dib et al.	2018	172.71	-60.75	–	–	–	–
Sampedro et al.	2017	172.604	-60.753	–	-5.84	-1.58	–
Joshi et al.	2016	172.71	-60.75	–	–	–	–
Kharchenko et al.	2016	172.703	-60.746	–	–	–	–
Dias et al.	2014	172.713	-60.733	–	-5.22	-1.66	–
Kharchenko et al.	2013	172.71	-60.75	–	-5.12	1.95	-3.0
Piskunov et al.	2008	172.702	-60.724	–	–	–	–
Kharchenko et al.	2005	172.71	-60.73	–	-2.05	6.05	–
Kharchenko et al.	2003	172.72	-60.75	–	-0.89	5.03	–
Dias et al.	2002	172.713	-60.733	–	-0.89	5.03	–
Lynga	1987	172.776	-60.809	–	–	–	–
van den Bergh & Hagen	1975	172.2	-60.533	–	–	–	–

💡 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–	3.91	0.86	1.85	950	-0.150	987	–	2
Li et al.	2025	4.58	1.62	–	950	-0.060	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.240⁽⁵⁾	–	–	–
Almeida et al.	2025	3.91	1.33	–	1256	–	987	–	–
Hunt & Reffert	2024	4.25	1.65	1.85	408	–	2221⁽¹⁾	–	–
Cavallo et al.	2024	2.61	1.75	–	1585	-0.380	–	–	–
Hunt & Reffert	2023	4.25	1.65	1.85	407	–	–	–	–
Just et al.	2023	–	–	–	50	–	97	–	–
Jadhav & Subramaniam	2021	3.91	0.86	–	1698	–	1677	–	2⁽¹⁾
Dias et al.	2021	3.91	1.33	–	1256	0.099	–	–	–
Cantat-Gaudin et al.	2020	3.91	0.86	–	1698	–	–	–	–
Kounkel et al.	2020	4.22	1.58	–	389	–	–	–	–
Cantat-Gaudin & Anders	2020	4.48	–	–	–	–	–	–	–
Soubiran et al.	2018	4.48	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.48	–	–	–	–	–	–	–
Dib et al.	2018	1.30	–	–	50	–	–	–	–
Joshi et al.	2016	1.30	0.35	–	50	–	42	–	–
Kharchenko et al.	2016	1.30	0.35	–	50	–	–	–	–
Kharchenko et al.	2013	1.30	0.35	–	50	–	–	–	–
Piskunov et al.	2008	0.78	0.35	–	1000	–	–	–	–
Kharchenko et al.	2005	0.78	0.35	–	1000	–	–	–	–
Kharchenko et al.	2003	1.00	0.32	–	–	–	–	–	–
Dias et al.	2002	0.78	0.35	–	1000	–	–	–	–

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

Visualization

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