UBC 520

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0.50 UTI
0.44
CN
0.69
Cdens
0.75
CC3
0.32
Clit
1.0
Cdup
Nm (P>50%) 44
Core radius and density 1.2 [pc], 3.4 [pc-2]
C3 classification AB
  • CN 0.44 Poorly populated
  • Cdens 0.69 Moderately dense
  • CC3 0.75 High quality
  • Clit 0.32 Poorly 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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UBC 520 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a relatively close distance, below 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 age and metallicity parameters (see Parameters). It is poorly 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: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data
🔍 Search references for UBC 520 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– 186.086 -66.672 0.513 -4.909 -0.074 –
Li et al. 2025 186.083 -66.672 0.492 -4.872 -0.095 –
Hu & Soubiran 2025 186.076 -66.674 – – – –
Almeida et al. 2025 186.112 -66.672 – – – –
Hunt & Reffert 2024 186.073 -66.674 0.51 -4.916 -0.08 –
Cavallo et al. 2024 186.076 -66.674 0.509 – – –
Hunt & Reffert 2023 186.073 -66.674 0.51 -4.916 -0.08 –
Almeida et al. 2023 186.089 -66.665 – – – –
Jadhav & Subramaniam 2021 186.083 -66.672 – – – –
Dias et al. 2021 186.112 -66.672 0.481 -4.87 -0.102 –
Cantat-Gaudin et al. 2020 186.083 -66.672 0.492 -4.872 -0.095 –
Castro-Ginard et al. 2020 186.138 -66.672 0.488 -4.89 -0.099 –

💡 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– 1.86 1.255 0.49 494 0.016 214 0.46 0
Li et al. 2025 1.65 1.27 – 854 -0.029 – – –
Hu & Soubiran 2025 – – – – -0.160(5) – – –
Almeida et al. 2025 1.97 1.61 – 288 – 175 – –
Hunt & Reffert 2024 1.85 1.24 0.49 426 – 293(1) – –
Cavallo et al. 2024 1.97 1.02 – 1000 0.530 – – –
Hunt & Reffert 2023 1.85 1.24 0.49 427 – – – –
Almeida et al. 2023 1.87 1.57 – 562 0.016 251(1) 0.46 –
Jadhav & Subramaniam 2021 1.86 1.23 – 794 – 177 – 0(1)
Dias et al. 2021 1.97 1.61 – 288 0.300 – – –
Cantat-Gaudin et al. 2020 1.86 1.23 – 794 – – – –
Kounkel et al. 2020 1.75 1.91 – 178 – – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 13314 95.5 186.08 -66.67 0.51 -4.93 -0.06 – 0.04

💡 Note: The % column shows the percentage of members that UBC 520 shares with each listed object.

Visualization
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UBC 520 UCC
UBC 520 HUNT23
UBC 520 CANTAT20
Galactocentric position diagram