UPK 23

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0.61 UTI
0.38
CN
0.52
Cdens
0.75
CC3
0.7
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 38
Radius (P>50% members) 13.2 [arcmin]
  • CN 0.38 Poorly populated
  • Cdens 0.52 Moderately dense
  • CC3 0.75 High quality
  • Clit 0.7 Moderately 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 23 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a close distance, below 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.
Close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 23 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 – 282.175 -12.904 1.004 -0.941 -2.13 8.437
Li et al. 2025 282.218 -12.879 1.021 -0.913 -2.127 –
Almeida et al. 2025 282.224 -12.868 – – – –
Alfonso et al. 2024 282.186 -12.854 0.946 -0.93 -2.134 –
Hunt & Reffert 2024 282.2 -12.883 0.979 -0.972 -2.169 -16.227
Cavallo et al. 2024 282.221 -12.87 0.984 – – –
Hunt & Reffert 2023 282.2 -12.883 0.979 -0.972 -2.169 -16.227
Almeida et al. 2023 282.257 -12.862 – – – –
Dias et al. 2021 282.224 -12.868 1.009 -0.918 -2.094 –
Cantat-Gaudin et al. 2020 282.218 -12.879 1.021 -0.913 -2.127 –
Cantat-Gaudin & Anders 2020 282.216 -12.865 1.002 -0.931 -2.088 –
Sim et al. 2019 282.21 -12.885 – -0.9 -2.08 –

💡 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 0.81 1.12 – 322 -0.063 – – –
Almeida et al. 2025 0.95 1.53 – 29 – 83 – –
Alfonso et al. 2024 0.97 1.11 – 183 0.251 – – –
Hunt & Reffert 2024 – – – – – 121* – –
Cavallo et al. 2024 1.01 1.04 – 269 0.580 – – –
Hunt & Reffert 2023 0.94 1.34 1.03 155 – – – –
Almeida et al. 2023 0.95 1.50 – 116 -0.219 146* 0.74 –
Tarricq et al. 2022 0.95 – – 117 – – – –
Dias et al. 2021 0.95 1.53 – 29 0.251 – – –
Cantat-Gaudin et al. 2020 0.97 1.11 – 110 – – – –
Cantat-Gaudin & Anders 2020 0.97 – – – – – – –
Sim et al. 2019 0.95 – – 355 – – – –

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

Visualization
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UPK 23 UCC
UPK 23 HUNT23
UPK 23 CANTAT20
Galactocentric position diagram