UPK 431

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0.72 UTI
0.5
CN
0.86
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification BA
Number of members (P>50%) 50
Radius (P>50% members) 16.0 [arcmin]
  • CN 0.5 Moderately populated
  • Cdens 0.86 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 431 is a moderately populated, dense object of high 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 absorption and age parameters (see Parameters). It is well-studied in the literature.
Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 431 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 – 108.165 -2.61 1.363 -2.485 0.758 11.653
Li et al. 2025 108.234 -2.635 1.346 -2.46 0.76 –
Almeida et al. 2025 108.283 -2.761 – – – –
Alfonso et al. 2024 108.232 -2.505 1.319 -2.431 0.709 –
Hunt & Reffert 2024 108.14 -2.567 1.348 -2.457 0.771 7.595
Cavallo et al. 2024 108.167 -2.726 1.356 – – –
Hunt & Reffert 2023 108.14 -2.567 1.348 -2.457 0.771 7.595
Almeida et al. 2023 108.285 -2.766 – – – –
He et al. 2022 108.179 -2.599 1.366 -2.457 0.787 –
Tarricq et al. 2022 108.143 -2.608 1.362 -2.43 0.775 –
Dias et al. 2021 108.283 -2.761 1.342 -2.457 0.749 17.737
Cantat-Gaudin et al. 2020 108.234 -2.635 1.346 -2.46 0.76 –
Cantat-Gaudin & Anders 2020 108.239 -2.631 1.331 -2.454 0.751 –
Sim et al. 2019 108.186 -2.721 – -2.44 0.77 –

💡 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 0.91 0.17 – 212 -0.057 – – –
Almeida et al. 2025 0.73 0.25 – 233 – 166 – –
Alfonso et al. 2024 0.74 0.00 – 593 -0.070 – – –
Hunt & Reffert 2024 – – – – – 136* – –
Cavallo et al. 2024 0.71 0.22 – 166 0.060 – – –
Hunt & Reffert 2023 0.69 0.14 0.60 426 – – – –
Almeida et al. 2023 0.72 0.09 – 100 -0.060 258* 0.56 –
He et al. 2022 – 0.30 – 178 – – – –
Tarricq et al. 2022 0.75 – – 617 – – – –
Dias et al. 2021 0.73 0.25 – 233 -0.073 – – –
Cantat-Gaudin et al. 2020 0.77 0.00 – 603 – – – –
Cantat-Gaudin & Anders 2020 0.74 – – – – – – –
Sim et al. 2019 0.73 – – 501 – – – –

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

Visualization
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UPK 431 UCC
UPK 431 HUNT23
UPK 431 CANTAT20
Galactocentric position diagram