UPK 528

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0.70 UTI
0.62
CN
1.0
Cdens
0.5
CC3
0.7
Clit
1.0
Cdup
C3 classification BB
Number of members (P>50%) 73
Radius (P>50% members) 8.5 [arcmin]
  • CN 0.62 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.5 Intermediate 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 528 is a moderately populated, very dense object of intermediate C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low 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 significant percentage of members with a later reported entry. See table with shared members information.

Close Low 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 528 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 – 137.035 -43.344 1.021 -7.696 1.961 22.309
Li et al. 2025 137.032 -43.346 0.999 -7.706 1.911 –
Almeida et al. 2025 137.071 -43.343 – – – –
Hunt & Reffert 2024 137.044 -43.362 1.021 -7.647 1.925 26.928
Cavallo et al. 2024 137.05 -43.334 1.025 – – –
Hunt & Reffert 2023 137.044 -43.362 1.021 -7.647 1.925 26.928
Almeida et al. 2023 137.074 -43.346 – – – –
He et al. 2022 137.045 -43.363 1.018 -7.706 1.973 –
Tarricq et al. 2022 137.054 -43.375 1.033 -7.674 1.95 –
Dias et al. 2021 137.071 -43.343 1.019 -7.705 1.869 –
Cantat-Gaudin et al. 2020 137.032 -43.346 0.999 -7.706 1.911 –
Cantat-Gaudin & Anders 2020 137.032 -43.346 1.013 -7.709 1.923 –
Sim et al. 2019 137.047 -43.354 – -7.69 1.89 –

💡 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 0.84 0.82 – 356 -0.327 – – –
Almeida et al. 2025 0.95 1.02 – 265 – 169 – –
Hunt & Reffert 2024 – – – – – 239* – –
Cavallo et al. 2024 0.96 0.72 – 437 0.320 – – –
Hunt & Reffert 2023 0.93 0.73 1.09 198 – – – –
Almeida et al. 2023 0.95 0.94 – 284 -0.093 169* 0.50 –
He et al. 2022 – 1.05 – 63 – – – –
Tarricq et al. 2022 0.99 – – 347 – – – –
Dias et al. 2021 0.95 1.02 – 265 -0.043 – – –
Cantat-Gaudin et al. 2020 1.01 0.51 – 347 – – – –
Cantat-Gaudin & Anders 2020 0.96 – – – – – – –
Sim et al. 2019 0.95 – – 79 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14424 65.8 137.03 -43.37 1.02 -7.68 1.97 25.69 0.0

💡 Note: The % column shows the percentage of members that UPK 528 shares with each listed object.

Visualization
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UPK 528 UCC
UPK 528 HUNT23
UPK 528 CANTAT20
Galactocentric position diagram