UPK 220

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0.84 UTI
0.83
CN
1.0
Cdens
1.0
CC3
0.69
Clit
1.0
Cdup
N50 (P>50% members) 313
Stellar density (N50/rad) 22.2 [N/pc2]
C3 classification AA
  • CN 0.83 Rich
  • 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 220 is a rich, 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, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

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

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 220 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– 350.954 66.505 1.03 -2.4 -2.649 -6.177
Almeida et al. 2025 350.988 66.509 – – – –
Alfonso et al. 2024 -9.063 66.483 1.003 -2.407 -2.626 –
Hunt & Reffert 2024 350.954 66.462 1.032 -2.391 -2.655 -2.191
Cavallo et al. 2024 350.932 66.503 1.03 – – –
Hunt & Reffert 2023 350.954 66.462 1.032 -2.391 -2.655 -2.191
Almeida et al. 2023 350.88 66.452 – – – –
He et al. 2022 350.996 66.517 1.033 -2.419 -2.644 –
Tarricq et al. 2022 350.961 66.487 1.023 -2.388 -2.685 –
Dias et al. 2021 350.988 66.509 1.008 -2.414 -2.592 -7.194
Cantat-Gaudin et al. 2020 350.955 66.505 1.009 -2.416 -2.584 –
Cantat-Gaudin & Anders 2020 350.942 66.505 1.012 -2.42 -2.582 –
Sim et al. 2019 350.973 66.502 – -2.41 -2.59 –

💡 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– 0.96 2.755 2.76 70 0.029 922 0.6 –
Almeida et al. 2025 0.95 2.73 – 20 – 591 – –
Alfonso et al. 2024 0.99 2.16 – 53 0.029 – – –
Hunt & Reffert 2024 – – – – – 1284(1) – –
Cavallo et al. 2024 1.08 2.96 – 85 0.630 – – –
Hunt & Reffert 2023 0.94 2.96 2.76 56 – – – –
Almeida et al. 2023 0.94 2.78 – 30 0.025 922(1) 0.60 –
He et al. 2022 – 3.30 – 112 – – – –
Tarricq et al. 2022 0.96 – – 120 – – – –
Dias et al. 2021 0.95 2.73 – 20 0.029 – – –
Cantat-Gaudin et al. 2020 0.99 2.16 – 110 – – – –
Cantat-Gaudin & Anders 2020 0.96 – – – – – – –
Sim et al. 2019 0.97 – – 562 – – – –

(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 402 83.1 350.95 66.51 1.03 -2.4 -2.65 -5.75 0.0

💡 Note: The % column shows the percentage of members that UPK 220 shares with each listed object.

Visualization
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UPK 220 UCC
UPK 220 HUNT23
UPK 220 CANTAT20
Galactocentric position diagram