UPK 131

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0.75 UTI
0.52
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 53
Radius (P>50% members) 11.3 [arcmin]
  • CN 0.52 Moderately populated
  • Cdens 1.0 Very 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 131 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, near 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 well-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 Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 131 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 – 315.508 45.422 1.016 2.832 -1.121 -7.468
Li et al. 2025 315.517 45.391 1.013 2.833 -1.08 –
Almeida et al. 2025 315.489 45.388 – – – –
Alfonso et al. 2024 315.46 45.404 0.988 2.799 -1.192 –
Zhang et al. 2024 315.477 45.448 – – – –
Hunt & Reffert 2024 315.477 45.448 1.015 2.723 -1.249 -13.52
Cavallo et al. 2024 315.542 45.319 1.019 – – –
Hunt & Reffert 2023 315.477 45.448 1.015 2.723 -1.249 -13.52
He et al. 2022 315.57 45.385 1.011 2.829 -1.133 –
Tarricq et al. 2022 315.448 45.407 0.999 2.837 -1.124 –
Dias et al. 2021 315.489 45.388 1.018 2.793 -1.129 –
Cantat-Gaudin et al. 2020 315.517 45.391 1.013 2.833 -1.08 –
Cantat-Gaudin & Anders 2020 315.499 45.375 1.014 2.784 -1.138 –
Sim et al. 2019 315.501 45.37 – 2.83 -1.09 –

💡 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 1.06 2.11 – 465 0.054 – – –
Almeida et al. 2025 0.96 1.84 – 461 – 162 – –
Alfonso et al. 2024 0.96 1.11 – 716 0.011 – – –
Zhang et al. 2024 – – – – -0.014* – – –
Hunt & Reffert 2024 – – – – – 213* – –
Cavallo et al. 2024 0.99 1.83 – 447 0.440 – – –
Hunt & Reffert 2023 0.94 1.78 1.97 348 – – – –
He et al. 2022 – 2.00 – 447 – – – –
Tarricq et al. 2022 0.94 – – 562 – – – –
Dias et al. 2021 0.96 1.84 – 461 0.011 – – –
Cantat-Gaudin et al. 2020 0.96 1.11 – 537 – – – –
Cantat-Gaudin & Anders 2020 0.96 – – – – – – –
Sim et al. 2019 0.98 – – 562 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14408 54.7 315.45 45.38 1.01 2.82 -1.13 -8.46 0.02

💡 Note: The % column shows the percentage of members that UPK 131 shares with each listed object.

Visualization
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UPK 131 UCC
UPK 131 HUNT23
UPK 131 CANTAT20
Galactocentric position diagram