Ruprecht 54

(VDBH 20; MWSC 1444; OCL 710; vdBergh-Hagen 20; ESO 430 23)

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0.79 UTI
0.78
CN
1.0
Cdens
0.75
CC3
0.71
Clit
1.0
Cdup
Nm (P>50%) 171
Core radius and density 1.2 [pc], 6.8 [pc-2]
C3 classification AB
  • CN 0.78 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.71 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Ruprecht 54 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.078, e_all=0.0124.

Data
🔍 Search references for Ruprecht 54 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 122.845 -31.947 0.224 -2.664 3.156 58.396
Li et al. 2025 122.844 -31.947 0.193 -2.66 3.124 –
Hu & Soubiran 2025 122.851 -31.941 – – – –
Almeida et al. 2025 122.85 -31.942 – – – –
Hunt & Reffert 2024 122.844 -31.949 0.222 -2.669 3.167 58.349
Cavallo et al. 2024 122.851 -31.941 0.223 – – –
Hunt & Reffert 2023 122.844 -31.949 0.222 -2.669 3.167 58.349
Almeida et al. 2023 122.853 -31.943 – – – –
Just et al. 2023 122.836 -31.942 – – – –
Dias et al. 2021 122.85 -31.942 0.196 -2.667 3.114 54.434
Cantat-Gaudin et al. 2020 122.844 -31.947 0.193 -2.66 3.124 –
Cantat-Gaudin & Anders 2020 122.844 -31.947 0.193 -2.66 3.124 –
Bica et al. 2019 122.827 -31.951 – – – –
Cantat-Gaudin et al. 2018 122.844 -31.947 0.193 -2.66 3.124 –
Dias et al. 2018 – – – -2.96 2.68 –
Sampedro et al. 2017 122.838 -31.947 – -4.75 2.07 –
Kharchenko et al. 2016 122.836 -31.942 – – – –
Dias et al. 2014 122.838 -31.947 – -5.65 0.65 –
Kharchenko et al. 2013 122.842 -31.945 – -1.62 6.89 –
Bukowiecki et al. 2011 122.842 -31.948 – – – –
Glushkova et al. 2010 122.84 -31.944 – – – –
Dias et al. 2002 122.838 -31.947 – -5.65 0.65 –
Lynga 1987 122.827 -31.951 – – – –
van den Bergh & Hagen 1975 122.325 -31.8 – – – –

💡 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] Bfrac BSS
UCC 99999– 4.06 1.28 0.5 579 -0.163 805 0.55 –
Li et al. 2025 3.99 0.93 – 596 0.056 – – –
Hu & Soubiran 2025 – – – – -0.260(5) – – –
Almeida et al. 2025 3.66 1.30 – 290 – 644 – –
Hunt & Reffert 2024 4.06 0.67 0.50 795 – 829(1) – –
Cavallo et al. 2024 3.82 1.30 – 562 -0.170 – – –
Hunt & Reffert 2023 4.06 0.67 0.50 796 – – – –
Almeida et al. 2023 3.84 1.49 – 142 -0.158 781(1) 0.55 –
Just et al. 2023 – – – 822 – 1324 – –
Dias et al. 2021 3.66 1.30 – 290 -0.163 – – –
Cantat-Gaudin et al. 2020 4.85 0.99 – 275 – – – –
Kounkel et al. 2020 4.14 1.28 – 457 – – – –
Cantat-Gaudin & Anders 2020 4.50 – – – – – – –
Cantat-Gaudin et al. 2018 4.50 – – – – – – –
Kharchenko et al. 2016 5.24 1.31 – 822 – – – –
Kharchenko et al. 2013 5.24 1.31 – 822 – – – –
Glushkova et al. 2010 3.48 1.10 – 282 – – – –
Dias et al. 2002 5.47 0.41 – 794 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
FoF 386 19.3 122.85 -31.96 0.24 -2.6 3.12 58.4 0.05

💡 Note: The % column shows the percentage of members that Ruprecht 54 shares with each listed object.

Visualization
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Ruprecht 54 UCC
Ruprecht 54 HUNT23
Ruprecht 54 CANTAT20
Galactocentric position diagram