UPK 50

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0.82 UTI
0.72
CN
1.0
Cdens
1.0
CC3
0.69
Clit
1.0
Cdup
N50 (P>50% members) 93
Stellar density (N50/rad) 5.3 [N/pc2]
C3 classification AA
  • CN 0.72 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.69 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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UPK 50 is a moderately populated, 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 near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 50 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 99999– 283.31 8.145 0.977 -1.316 -3.805 -3.885
Li et al. 2025 283.309 8.172 0.97 -1.315 -3.817 –
Almeida et al. 2025 283.272 8.194 – – – –
Hunt & Reffert 2024 283.299 8.197 0.973 -1.321 -3.796 -4.239
Cavallo et al. 2024 283.3 8.181 0.975 – – –
Hunt & Reffert 2023 283.299 8.197 0.973 -1.321 -3.796 -4.239
Almeida et al. 2023 283.205 8.236 – – – –
He et al. 2022 283.268 8.195 0.997 -1.317 -3.776 –
Tarricq et al. 2022 283.293 8.108 0.995 -1.325 -3.793 –
Dias et al. 2021 283.272 8.194 0.97 -1.309 -3.803 –
Cantat-Gaudin et al. 2020 283.309 8.172 0.97 -1.315 -3.817 –
Cantat-Gaudin & Anders 2020 283.288 8.177 0.966 -1.298 -3.813 –
Sim et al. 2019 283.274 8.171 – -1.33 -3.79 –

💡 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– 0.99 1.36 1.18 243 0.046 343 0.66 –
Li et al. 2025 0.90 1.19 – 312 -0.122 – – –
Almeida et al. 2025 0.99 1.40 – 252 – 359 – –
Hunt & Reffert 2024 – – – – – 343(1) – –
Cavallo et al. 2024 1.11 1.29 – 355 0.600 – – –
Hunt & Reffert 2023 0.98 1.32 1.18 164 – – – –
Almeida et al. 2023 0.99 1.50 – 164 0.042 321(1) 0.66 –
He et al. 2022 – 1.45 – 141 – – – –
Tarricq et al. 2022 0.97 – – 234 – – – –
Dias et al. 2021 0.99 1.40 – 252 0.050 – – –
Cantat-Gaudin et al. 2020 1.00 1.07 – 219 – – – –
Cantat-Gaudin & Anders 2020 1.01 – – – – – – –
Sim et al. 2019 0.99 – – 501 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 358 100.0 283.31 8.13 0.97 -1.32 -3.81 -3.89 0.1
CWWDL 14442 77.4 283.32 8.18 0.98 -1.32 -3.81 -2.6 0.01

💡 Note: The % column shows the percentage of members that UPK 50 shares with each listed object.

Visualization
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UPK 50 UCC
UPK 50 HUNT23
UPK 50 CANTAT20
Galactocentric position diagram