UPK 65

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0.82 UTI
0.56
CN
0.95
Cdens
1.0
CC3
0.79
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 63
Radius (P>50% members) 16.4 [arcmin]
  • CN 0.56 Moderately populated
  • Cdens 0.95 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.79 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 65 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a 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 well-studied in the literature.
Close Moderate 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 65 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 – 286.455 23.29 1.312 -1.843 -3.625 -16.156
Li et al. 2025 286.514 23.337 1.291 -1.84 -3.587 –
Hu & Soubiran 2025 286.534 23.34 – – – –
Almeida et al. 2025 286.531 23.357 – – – –
Alfonso et al. 2024 286.491 23.266 1.281 -1.823 -3.649 –
Hunt & Reffert 2024 286.525 23.297 1.317 -1.832 -3.667 -17.892
Cavallo et al. 2024 286.534 23.34 1.311 – – –
Hunt & Reffert 2023 286.525 23.297 1.317 -1.832 -3.667 -17.892
Almeida et al. 2023 286.555 23.333 – – – –
He et al. 2022 286.515 23.271 1.291 -1.836 -3.647 –
Tarricq et al. 2022 286.543 23.375 1.286 -1.816 -3.635 –
Dias et al. 2021 286.531 23.357 1.287 -1.836 -3.582 –
Cantat-Gaudin et al. 2020 286.514 23.337 1.291 -1.84 -3.587 –
Cantat-Gaudin & Anders 2020 286.514 23.349 1.287 -1.841 -3.586 –
Sim et al. 2019 286.502 23.325 – -1.86 -3.56 –

💡 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 0.69 1.00 – 497 -0.146 – – –
Hu & Soubiran 2025 – – – – -0.090* – – –
Almeida et al. 2025 0.77 1.12 – 214 – 105 – –
Alfonso et al. 2024 0.74 0.80 – 446 0.123 – – –
Hunt & Reffert 2024 – – – – – 95* – –
Cavallo et al. 2024 0.80 0.99 – 646 0.400 – – –
Hunt & Reffert 2023 0.73 1.07 1.32 224 – – – –
Almeida et al. 2023 0.75 1.41 – 249 -0.271 111* 0.70 –
He et al. 2022 – 1.10 – 501 – – – –
Tarricq et al. 2022 0.73 – – 288 – – – –
Dias et al. 2021 0.77 1.12 – 214 0.123 – – –
Cantat-Gaudin et al. 2020 0.74 0.80 – 275 – – – –
Cantat-Gaudin & Anders 2020 0.76 – – – – – – –
Sim et al. 2019 0.76 – – 794 – – – –

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

Visualization
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UPK 65 UCC
UPK 65 HUNT23
UPK 65 CANTAT20
Galactocentric position diagram