Ruprecht 128

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

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0.96 UTI
0.82
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 284
Radius (P>50% members) 3.7 [arcmin]
  • CN 0.82 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
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 moderate 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 very well-studied in the literature.
Relatively close Moderate 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.

Data
🔍 Search references for Ruprecht 128 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 266.064 -34.878 0.504 1.887 -1.285 -39.482
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 – – – –
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 –
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 –

💡 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 1.59 2.85 – 842 -0.055 – – –
Hu & Soubiran 2025 – – – – -0.150* – – –
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 – – – – – 3939* – –
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* 0.69 –
Just et al. 2023 – – – 1585 – 115 – –
Dias et al. 2021 1.56 2.49 – 845 0.144 – – –
Cantat-Gaudin et al. 2020 1.77 1.92 – 955 – – – –
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 5.03 – 1585 – – – –
Kharchenko et al. 2013 2.49 5.03 – 1585 – – – –
Dias et al. 2002 2.49 5.03 – 1585 – – – –

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

Visualization
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Ruprecht 128 UCC
Ruprecht 128 HUNT23
Ruprecht 128 CANTAT20
Galactocentric position diagram