UPK 545

(OCSN 314)

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0.87 UTI
0.83
CN
1.0
Cdens
1.0
CC3
0.75
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 305
Radius (P>50% members) 44.9 [arcmin]
  • CN 0.83 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 545 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is well-studied in the literature.

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

Very close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 545 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 – 130.971 -58.756 3.058 -8.784 2.788 26.814
Li et al. 2025 130.809 -58.629 3.036 -8.752 2.72 –
Almeida et al. 2025 130.757 -58.503 – – – –
Alfonso et al. 2024 130.435 -58.064 2.928 -8.587 2.72 –
Hunt & Reffert 2024 130.975 -58.784 2.953 -8.417 2.531 25.615
Cavallo et al. 2024 129.895 -57.261 2.956 – – –
Hunt & Reffert 2023 130.975 -58.784 2.953 -8.417 2.531 25.615
Qin et al. 2023 130.94 -58.73 3.05 -8.87 2.61 26.97
He et al. 2022 130.908 -58.681 3.06 -8.753 2.789 –
Tarricq et al. 2022 130.889 -58.787 3.065 -8.7 2.72 –
Dias et al. 2021 130.757 -58.503 3.015 -8.787 2.71 27.758
Cantat-Gaudin et al. 2020 130.809 -58.629 3.036 -8.752 2.72 –
Cantat-Gaudin & Anders 2020 130.774 -58.631 3.032 -8.777 2.717 –
Sim et al. 2019 130.838 -58.725 – -8.74 2.77 –

💡 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 0.36 0.24 – 83 0.159 – – –
Almeida et al. 2025 0.34 0.20 – 137 – 228 – –
Alfonso et al. 2024 0.35 0.27 – 85 0.120 – – –
Hunt & Reffert 2024 – – – – – 155* – –
Cavallo et al. 2024 0.35 0.52 – 23 -0.110 – – –
Hunt & Reffert 2023 0.33 0.09 0.53 102 – – – –
Qin et al. 2023 0.37 0.28 – 71 – – – –
He et al. 2022 – 0.35 – 63 – – – –
Tarricq et al. 2022 0.34 – – 81 – – – –
Dias et al. 2021 0.34 0.20 – 137 0.121 – – –
Cantat-Gaudin et al. 2020 0.35 0.27 – 79 – – – –
Cantat-Gaudin & Anders 2020 0.33 – – – – – – –
Sim et al. 2019 0.33 – – 89 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14588 30.8 130.95 -58.79 3.08 -8.81 2.84 27.2 0.0

💡 Note: The % column shows the percentage of members that UPK 545 shares with each listed object.

Visualization
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UPK 545 UCC
UPK 545 HUNT23
UPK 545 CANTAT20
Galactocentric position diagram