UPK 54

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0.80 UTI
0.75
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 106
Radius (P>50% members) 16.5 [arcmin]
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.75 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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UPK 54 is a rich, very dense object of high C3 quality. Its parallax locates it at a close 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 metallicity parameter (see Parameters). It is well-studied in the literature.
Close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 54 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 – 286.129 15.73 1.203 -0.569 -5.886 -3.225
Li et al. 2025 286.157 15.689 1.172 -0.558 -5.854 –
Almeida et al. 2025 286.169 15.645 – – – –
Alfonso et al. 2024 286.407 15.258 1.114 -0.57 -5.937 –
Hunt & Reffert 2024 286.254 15.722 1.209 -0.575 -5.912 -4.904
Cavallo et al. 2024 286.192 15.714 1.214 – – –
Hunt & Reffert 2023 286.254 15.722 1.209 -0.575 -5.912 -4.904
Almeida et al. 2023 286.216 15.663 – – – –
He et al. 2022 286.161 15.761 1.218 -0.539 -5.899 –
Tarricq et al. 2022 286.073 15.779 1.221 -0.551 -5.89 –
Dias et al. 2021 286.169 15.645 1.166 -0.556 -5.901 36.043
Cantat-Gaudin et al. 2020 286.157 15.689 1.172 -0.558 -5.854 –
Cantat-Gaudin & Anders 2020 286.132 15.682 1.189 -0.559 -5.864 –
Sim et al. 2019 286.112 15.681 – -0.57 -5.88 –

💡 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 0.83 0.99 – 142 0.359 – – –
Almeida et al. 2025 0.81 1.07 – 171 – 341 – –
Alfonso et al. 2024 0.81 0.94 – 100 0.320 – – –
Hunt & Reffert 2024 – – – – – 256* – –
Cavallo et al. 2024 0.87 1.35 – 89 0.320 – – –
Hunt & Reffert 2023 0.80 1.17 0.60 77 – – – –
Almeida et al. 2023 0.80 1.25 – 202 -0.188 326* 0.83 –
He et al. 2022 – 1.40 – 79 – – – –
Tarricq et al. 2022 0.79 – – 120 – – – –
Dias et al. 2021 0.81 1.07 – 171 0.321 – – –
Cantat-Gaudin et al. 2020 0.81 0.94 – 117 – – – –
Cantat-Gaudin & Anders 2020 0.82 – – – – – – –
Sim et al. 2019 0.83 – – 79 – – – –

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

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