UBC 381

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0.35 UTI
0.35
CN
0.13
Cdens
0.75
CC3
0.26
Clit
1.0
Cdup
Nm (P>50%) 35
Core radius and density 3.3 [pc], 0.6 [pc-2]
C3 classification AB
  • CN 0.35 Poorly populated
  • Cdens 0.13 Very loose
  • CC3 0.75 High quality
  • Clit 0.26 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 381 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a moderate 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 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: intermediate fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.98 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.98 (50th percentile), true positive (human-assigned).

Data
🔍 Search references for UBC 381 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– 316.265 48.718 0.445 -0.395 -2.226 -27.2
Almeida et al. 2025 316.239 48.735 – – – –
Hunt & Reffert 2024 316.25 48.7 0.436 -0.424 -2.247 –
Cavallo et al. 2024 316.268 48.727 0.44 – – –
Hunt & Reffert 2023 316.25 48.7 0.436 -0.424 -2.247 –
Almeida et al. 2023 316.285 48.728 – – – –
Jadhav & Subramaniam 2021 316.25 48.726 – – – –
Dias et al. 2021 316.239 48.735 0.437 -0.395 -2.174 –
Cantat-Gaudin et al. 2020 316.25 48.726 0.44 -0.415 -2.19 –
Castro-Ginard et al. 2020 316.25 48.723 0.441 -0.408 -2.18 –

💡 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– 2.15 1.72 1.515 101 0.286 181 0.68 0
Almeida et al. 2025 2.15 1.68 – 170 – 172 – –
Hunt & Reffert 2024 2.12 1.72 1.52 72 – 224(1) – –
Cavallo et al. 2024 2.29 1.91 – 93 0.460 – – –
Hunt & Reffert 2023 2.12 1.72 1.51 72 – – – –
Almeida et al. 2023 2.04 1.90 – 101 0.059 190(1) 0.68 –
Jadhav & Subramaniam 2021 2.17 1.32 – 331 – 130 – 0(1)
Dias et al. 2021 2.15 1.68 – 170 0.286 – – –
Cantat-Gaudin et al. 2020 2.17 1.32 – 331 – – – –
Kounkel et al. 2020 2.35 1.97 – 18 – – – –

(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 13942 77.1 316.27 48.73 0.46 -0.4 -2.22 -27.2 0.01

💡 Note: The % column shows the percentage of members that UBC 381 shares with each listed object.

Visualization
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UBC 381 UCC
UBC 381 HUNT23
UBC 381 CANTAT20
Galactocentric position diagram