Ruprecht 66

(VDBH 41; MWSC 1530; OCL 732; vdBergh-Hagen 41; ESO 313 08; FSR 1388)

0.97 UTI

0.83

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 321

Radius (P>50% members) 2.5 [arcmin]

C_N 0.83 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 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Ruprecht 66 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 mass parameter (see Parameters). It is very well-studied in the literature.

Distant Moderate extinction Massive Near-solar metallicity Old

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Ruprecht 66 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	–	130.143	-38.069	0.233	-3.099	3.089	38.079
Li et al.	2025	130.142	-38.071	0.222	-3.115	3.085	–
Hu & Soubiran	2025	130.143	-38.073	–	–	–	–
Almeida et al.	2025	130.15	-38.074	–	–	–	–
Hunt & Reffert	2024	130.134	-38.072	0.245	-3.097	3.086	38.846
Cavallo et al.	2024	130.143	-38.073	0.246	–	–	–
Hunt & Reffert	2023	130.134	-38.072	0.245	-3.097	3.086	38.846
Almeida et al.	2023	130.152	-38.068	–	–	–	–
Just et al.	2023	130.112	-38.052	–	–	–	–
Dias et al.	2021	130.15	-38.074	0.223	-3.13	3.076	44.424
Cantat-Gaudin et al.	2020	130.142	-38.071	0.222	-3.115	3.085	–
Cantat-Gaudin & Anders	2020	130.142	-38.071	0.222	-3.115	3.085	–
Soubiran et al.	2018	130.142	-38.071	–	–	–	47.17
Bica et al.	2019	130.126	-38.073	–	–	–	–
Cantat-Gaudin et al.	2018	130.142	-38.071	0.222	-3.115	3.085	–
Kharchenko et al.	2016	130.112	-38.052	–	–	–	–
Dias et al.	2014	130.142	-38.08	–	-1.8	3.2	–
Kharchenko et al.	2013	130.117	-38.055	–	-6.37	9.67	–
Dias et al.	2002	130.142	-38.08	–	-1.8	3.2	–

💡 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]	Bfr	BSS
Li et al.	2025	4.16	1.68	–	1196	0.058	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.160*	–	–	–
Almeida et al.	2025	4.13	1.91	–	1211	–	1329	–	–
Hunt & Reffert	2024	–	–	–	–	–	2806*	–	–
Cavallo et al.	2024	3.16	1.85	–	1349	-0.110	–	–	–
Hunt & Reffert	2023	3.68	1.50	1.55	1644	–	–	–	–
Almeida et al.	2023	4.15	1.96	–	1074	-0.144	1220*	0.72	–
Just et al.	2023	–	–	–	813	–	525	–	–
Dias et al.	2021	4.13	1.91	–	1211	-0.100	–	–	–
Cantat-Gaudin et al.	2020	3.66	1.54	–	1413	–	–	–	–
Cantat-Gaudin & Anders	2020	3.99	–	–	–	–	–	–	–
Soubiran et al.	2018	3.99	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.99	–	–	–	–	–	–	–
Kharchenko et al.	2016	3.55	2.39	–	813	–	–	–	–
Kharchenko et al.	2013	3.55	2.39	–	813	–	–	–	–
Dias et al.	2002	3.76	2.79	–	603	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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