UBC 178

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0.72 UTI
0.47
CN
1.0
Cdens
0.75
CC3
0.7
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 47
Radius (P>50% members) 7.8 [arcmin]
  • CN 0.47 Poorly populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.7 Moderately 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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UBC 178 is a poorly populated, very 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 metallicity and mass parameters (see Parameters). It is moderately studied in the literature.

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

Close Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

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 – 346.168 63.361 1.163 -1.223 -1.839 -14.65
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] Bfr BSS
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 – – – – – 106* – –
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* 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 – – – –

(*): Indicates that this parameter is assigned more than one value 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 – 0.26

💡 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