Ruprecht 122

(VDBH 202; BH 202; vdBergh-Hagen 202; ESO 332 09; MWSC 2486)

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0.89 UTI
0.89
CN
1.0
Cdens
1.0
CC3
0.79
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 476
Radius (P>50% members) 6.0 [arcmin]
  • CN 0.89 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.79 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Ruprecht 122 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above 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 metallicity and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Ruprecht 122 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 – 253.787 -40.949 0.565 -1.871 -3.796 -49.302
Li et al. 2025 253.779 -40.947 0.551 -1.869 -3.802 –
Hu & Soubiran 2025 253.783 -40.947 – – – –
Almeida et al. 2025 253.777 -40.943 – – – –
Hunt & Reffert 2024 253.787 -40.957 0.569 -1.875 -3.795 -49.618
Cavallo et al. 2024 253.783 -40.947 0.57 – – –
Hunt & Reffert 2023 253.787 -40.957 0.569 -1.875 -3.795 -49.618
Dias et al. 2021 253.777 -40.943 0.555 -1.87 -3.788 -49.77
Cantat-Gaudin et al. 2020 253.779 -40.947 0.551 -1.869 -3.802 –
Cantat-Gaudin & Anders 2020 253.779 -40.947 0.551 -1.869 -3.802 –
Soubiran et al. 2018 253.779 -40.947 – – – -50.06
Bica et al. 2019 253.788 -40.951 – – – –
Cantat-Gaudin et al. 2018 253.779 -40.947 0.551 -1.869 -3.802 –
Dias et al. 2014 253.783 -40.95 – -2.55 -2.89 –
Dias et al. 2002 253.783 -40.95 – -2.55 -2.89 –

💡 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 1.88 1.95 – 472 0.341 – – –
Hu & Soubiran 2025 – – – – -0.270* – – –
Almeida et al. 2025 1.50 1.89 – 579 – 629 – –
Hunt & Reffert 2024 – – – – – 3284* – –
Cavallo et al. 2024 1.45 2.00 – 617 0.020 – – –
Hunt & Reffert 2023 1.63 1.82 1.29 377 – – – –
Dias et al. 2021 1.50 1.89 – 579 0.118 – – –
Cantat-Gaudin et al. 2020 1.75 1.84 – 380 – – – –
Cantat-Gaudin & Anders 2020 1.72 – – – – – – –
Soubiran et al. 2018 1.72 – – – – – – –
Cantat-Gaudin et al. 2018 1.72 – – – – – – –
Dias et al. 2002 1.61 2.70 – 112 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
VDBH 203 5.3 253.83 -40.93 0.58 -1.91 -3.75 -50.18 0.0

💡 Note: The % column shows the percentage of members that Ruprecht 122 shares with each listed object.

Visualization
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Ruprecht 122 UCC
Ruprecht 122 HUNT23
Ruprecht 122 CANTAT20
Galactocentric position diagram