UBC 178

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0.55 UTI
0.47
CN
0.89
Cdens
0.75
CC3
0.39
Clit
0.96
Cdup
Nm (P>50%) 47
Core radius and density 0.7 [pc], 4.5 [pc-2]
C3 classification AB
  • CN 0.47 Poorly populated
  • Cdens 0.89 Dense
  • CC3 0.75 High quality
  • Clit 0.39 Poorly studied
  • Cdup 0.96 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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UBC 178 is a poorly populated, dense object of 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, very young cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is poorly studied in the literature.

Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Liu et al. (2025)
Classified as primordial binary cluster 344 along with Theia_4, and as primordial binary cluster 374 along with ASCC_125, and of multiple system 8 along with UPK_198, Theia_4, ASCC_125 and HSC_862.

Palma et al. (2025)
Part of multiple system G82, along with Theia_4, FSR_0416, HSC_862, HSC_892, ASCC_125 and UPK_198.

Almeida et al. (2025)
Mass determination: good 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 178 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– 346.168 63.361 1.163 -1.223 -1.839 -14.65
Liu et al. 2025 346.15 63.36 1.18 -1.13 -1.9 0.73
Li et al. 2025 346.201 63.36 1.148 -1.235 -1.823 –
Almeida et al. 2025 346.212 63.326 – – – –
Alfonso et al. 2024 -14.273 63.157 1.142 -1.149 -2.05 –
Hunt & Reffert 2024 346.148 63.355 1.176 -1.127 -1.896 0.73
Celli et al. 2024 346.201 63.36 – – – –
Cavallo et al. 2024 346.281 63.321 1.174 – – –
Hunt & Reffert 2023 346.148 63.355 1.176 -1.127 -1.896 0.73
Almeida et al. 2023 346.201 63.325 – – – –
He et al. 2022 344.226 62.745 1.187 -1.16 -2.364 –
Dias et al. 2021 346.212 63.326 1.146 -1.2 -1.834 –
Cantat-Gaudin et al. 2020 346.201 63.36 1.148 -1.235 -1.823 –
Castro-Ginard et al. 2020 346.228 63.357 1.148 -1.228 -1.803 –

💡 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– 0.83 1.965 1.3 10 -0.030 415 0.61 –
Liu et al. 2025 1.45 0.65 – 12 – – – –
Li et al. 2025 0.64 2.28 – 8 -0.353 – – –
Almeida et al. 2025 0.87 1.98 – 11 – 522 – –
Alfonso et al. 2024 0.94 1.58 – 10 0.244 – – –
Hunt & Reffert 2024 0.82 1.95 1.30 4 – 106(1) – –
Celli et al. 2024 – – – 10 – 308 – –
Cavallo et al. 2024 0.82 2.05 – 6 -0.030 – – –
Hunt & Reffert 2023 0.82 1.95 1.30 4 – – – –
Almeida et al. 2023 0.83 2.11 – 8 -0.047 576(1) 0.61 –
He et al. 2022 – 2.80 – 3 – – – –
Dias et al. 2021 0.87 1.98 – 11 0.245 – – –
Cantat-Gaudin et al. 2020 0.95 1.58 – 10 – – – –
Kounkel et al. 2020 0.79 1.85 – 15 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Theia 46 4.3 346.44 63.35 1.32 -1.25 -1.83 – 0.21

💡 Note: The % column shows the percentage of members that UBC 178 shares with each listed object.

Visualization
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UBC 178 UCC
UBC 178 HUNT23
UBC 178 CANTAT20
Galactocentric position diagram