UPK 166

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0.87 UTI
0.86
CN
1.0
Cdens
1.0
CC3
0.75
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 386
Radius (P>50% members) 32.9 [arcmin]
  • CN 0.86 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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 166 is a rich, very dense object of very 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, young cluster (see Parameters). It is well-studied in the literature.

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

Close Low extinction Near-solar metallicity Young

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 166 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 – 339.077 46.908 1.517 -0.931 -3.299 -11.085
Li et al. 2025 339.203 46.927 1.508 -0.907 -3.229 –
Almeida et al. 2025 339.199 46.905 – – – –
Alfonso et al. 2024 339.003 46.9 1.486 -0.9 -3.3 –
Zhang et al. 2024 339.203 47.008 – – – –
Hunt & Reffert 2024 339.203 47.008 1.521 -0.937 -3.302 -10.26
Celli et al. 2024 339.203 46.927 – – – –
Cavallo et al. 2024 338.973 46.899 1.518 – – –
Hunt & Reffert 2023 339.203 47.008 1.521 -0.937 -3.302 -10.26
He et al. 2022 339.075 46.965 1.5 -0.908 -3.279 –
Dias et al. 2021 339.199 46.905 1.509 -0.905 -3.231 -7.988
Cantat-Gaudin et al. 2020 339.203 46.927 1.508 -0.907 -3.229 –
Cantat-Gaudin & Anders 2020 339.178 46.878 1.51 -0.925 -3.214 –
Sim et al. 2019 339.071 46.958 – -0.92 -3.26 –

💡 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 0.67 0.41 – 34 0.142 – – –
Almeida et al. 2025 0.62 0.44 – 45 – 431 – –
Alfonso et al. 2024 0.66 0.27 – 31 -0.000 – – –
Zhang et al. 2024 – – – – -0.063* – – –
Hunt & Reffert 2024 – – – – – 249* – –
Celli et al. 2024 – – – 27 – 434 – –
Cavallo et al. 2024 0.69 0.62 – 10 -0.060 – – –
Hunt & Reffert 2023 0.64 0.18 0.55 16 – – – –
He et al. 2022 – 0.65 – 32 – – – –
Dias et al. 2021 0.62 0.44 – 45 -0.001 – – –
Cantat-Gaudin et al. 2020 0.66 0.27 – 27 – – – –
Cantat-Gaudin & Anders 2020 0.65 – – – – – – –
Sim et al. 2019 0.65 – – 40 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14299 16.1 339.13 47.02 1.51 -0.9 -3.25 -12.89 0.0

💡 Note: The % column shows the percentage of members that UPK 166 shares with each listed object.

Visualization
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UPK 166 UCC
UPK 166 HUNT23
UPK 166 CANTAT20
Galactocentric position diagram