Ruprecht 128

(VDBH 243; MWSC 2672; vdBergh-Hagen 243; OCL 1020; ESO 393 17; FoF 716)

0.89 UTI

0.82

C_N

1.0

C_dens

1.0

C_C3

0.81

C_lit

1.0

C_dup

N_m (P>50%) 284

Core radius and density 0.9 [pc], 21 [pc^-2]

C3 classification AA

C_N 0.82 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.81 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 128 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, 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.

Relatively close High extinction Massive Near-solar metallicity Intermediate age

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: 0.37 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.37 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1371, e_all=0.0031.

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).

Data

🔍 Search references for Ruprecht 128 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–	266.064	-34.878	0.504	1.887	-1.285	-39.482
Otto et al.	2026	266.066	-34.877	–	1.89	-1.26	-39.8
Li et al.	2025	266.063	-34.879	0.498	1.889	-1.262	–
Hu & Soubiran	2025	266.061	-34.871	–	–	–	–
Wei et al.	2025	266.069	-34.88	0.516	1.895	-1.278	–
Almeida et al.	2025	266.056	-34.873	–	–	–	–
Hunt & Reffert	2024	266.066	-34.877	0.494	1.88	-1.281	-23.391
Cavallo et al.	2024	266.061	-34.871	0.496	–	–	–
Hunt & Reffert	2023	266.066	-34.877	0.494	1.88	-1.281	-23.391
Almeida et al.	2023	266.059	-34.872	–	–	–	–
Just et al.	2023	266.06	-34.885	–	–	–	–
Jadhav & Subramaniam	2021	266.063	-34.879	–	–	–	–
Dias et al.	2021	266.056	-34.873	0.499	1.883	-1.264	-39.563
Cantat-Gaudin et al.	2020	266.063	-34.879	0.498	1.889	-1.262	–
Cantat-Gaudin & Anders	2020	266.063	-34.879	0.498	1.889	-1.262	–
Liu & Pang	2019	266.054	-34.874	0.493	1.843	-1.285	–
Soubiran et al.	2018	266.063	-34.879	–	–	–	-39.79
Bica et al.	2019	266.106	-34.931	–	–	–	–
Cantat-Gaudin et al.	2018	266.063	-34.879	0.498	1.889	-1.262	–
Dias et al.	2018	–	–	–	2.0	-0.31	–
Sampedro et al.	2017	266.075	-34.883	–	1.92	-1.22	–
Kharchenko et al.	2016	266.06	-34.885	–	–	–	–
Dias et al.	2014	266.075	-34.883	–	1.03	-1.12	–
Kharchenko et al.	2013	266.07	-34.885	–	-4.15	1.43	–
Dias et al.	2002	266.075	-34.883	–	1.03	-1.12	–
Lynga	1987	266.062	-34.875	–	–	–	–
van den Bergh & Hagen	1975	265.225	-34.85	–	–	–	–

💡 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–	1.86	3.01	2.53	955	-0.102	1118	0.69	0
Otto et al.	2026	–	–	–	955	0.130⁽¹⁵⁾	–	–	–
Li et al.	2025	1.59	2.85	–	842	-0.055	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.150⁽⁵⁾	–	–	–
Wei et al.	2025	2.95	3.00	–	1510	-0.750	1189	0.69	–
Almeida et al.	2025	1.56	2.49	–	845	–	1046	–	–
Hunt & Reffert	2024	1.86	3.03	2.53	251	–	3939⁽¹⁾	–	–
Cavallo et al.	2024	1.21	3.62	–	676	-0.960	–	–	–
Hunt & Reffert	2023	1.86	3.02	2.53	251	–	–	–	–
Almeida et al.	2023	1.70	2.76	–	520	0.134	846⁽¹⁾	0.69	–
Just et al.	2023	–	–	–	1585	–	115	–	–
Jadhav & Subramaniam	2021	1.77	1.92	–	955	–	1412	–	0⁽¹⁾
Dias et al.	2021	1.56	2.49	–	845	0.144	–	–	–
Cantat-Gaudin et al.	2020	1.77	1.92	–	955	–	–	–	–
Kounkel et al.	2020	2.17	3.82	–	1000	–	–	–	–
Cantat-Gaudin & Anders	2020	1.90	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1410	-0.500	–	–	–
Soubiran et al.	2018	1.90	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.90	–	–	–	–	–	–	–
Kharchenko et al.	2016	2.49	5.12	–	1585	–	–	–	–
Kharchenko et al.	2013	2.49	5.12	–	1585	–	–	–	–
Dias et al.	2002	2.49	5.12	–	1585	–	–	–	–

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

Visualization

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