UPK 642

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0.51 UTI
0.27
CN
0.21
Cdens
0.75
CC3
0.65
Clit
1.0
Cdup
N50 (P>50% members) 27
Radius (P>50% members) 17.9 [arcmin]
C3 classification AB
  • CN 0.27 Poorly populated
  • Cdens 0.21 Very loose
  • CC3 0.75 High quality
  • Clit 0.65 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 642 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a close distance, below 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 parameter (see Parameters). It is moderately studied in the literature.
Close Low 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 642 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– 263.081 -44.242 1.033 2.274 -4.324 9.611
Li et al. 2025 263.081 -44.242 1.025 2.317 -4.331 –
Almeida et al. 2025 263.116 -44.28 – – – –
Alfonso et al. 2024 263.15 -44.228 1.001 2.271 -4.384 –
Hunt & Reffert 2024 263.026 -44.321 1.025 2.268 -4.393 13.092
Cavallo et al. 2024 263.109 -44.216 1.031 – – –
Hunt & Reffert 2023 263.026 -44.321 1.025 2.268 -4.393 13.092
Dias et al. 2021 263.116 -44.28 1.024 2.345 -4.35 –
Cantat-Gaudin et al. 2020 263.081 -44.242 1.025 2.317 -4.331 –
Cantat-Gaudin & Anders 2020 263.075 -44.32 1.019 2.347 -4.344 –
Sim et al. 2019 263.089 -44.276 – 2.31 -4.29 –

💡 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– 0.92 0.39 0.79 124 0.175 72 – –
Li et al. 2025 0.85 0.45 – 72 -0.046 – – –
Almeida et al. 2025 0.94 0.45 – 124 – 86 – –
Alfonso et al. 2024 0.92 0.27 – 200 0.210 – – –
Hunt & Reffert 2024 – – – – – 58(1) – –
Cavallo et al. 2024 0.88 0.20 – 251 0.140 – – –
Hunt & Reffert 2023 0.92 0.39 0.79 100 – – – –
Tarricq et al. 2022 0.89 – – 170 – – – –
Dias et al. 2021 0.94 0.45 – 124 0.210 – – –
Cantat-Gaudin et al. 2020 0.92 0.27 – 166 – – – –
Cantat-Gaudin & Anders 2020 0.95 – – – – – – –
Sim et al. 2019 0.95 – – 100 – – – –

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

Visualization
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UPK 642 UCC
UPK 642 HUNT23
UPK 642 CANTAT20
Galactocentric position diagram