UBC 8

(Renou 23; OCSN 279)

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0.87 UTI
0.76
CN
1.0
Cdens
1.0
CC3
0.79
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 130
Radius (P>50% members) 18.2 [arcmin]
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.79 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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UBC 8 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close 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 well-studied in the literature.

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

Close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UBC 8 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 – 84.467 57.138 2.083 -3.22 -3.997 -6.46
Li et al. 2025 84.519 57.124 2.052 -3.149 -3.989 –
Wei et al. 2025 84.481 57.149 2.086 -3.244 -3.981 –
Alfonso et al. 2024 84.485 57.155 2.046 -3.231 -3.988 –
Zhang et al. 2024 84.526 57.108 – – – –
Hunt & Reffert 2024 84.526 57.108 2.07 -3.255 -3.989 -6.626
Cavallo et al. 2024 84.421 57.16 2.082 – – –
Hunt & Reffert 2023 84.526 57.108 2.07 -3.255 -3.989 -6.626
Qin et al. 2023 84.47 57.14 2.09 -3.25 -4.01 -6.11
He et al. 2022 84.456 57.145 2.087 -3.239 -3.992 –
Tarricq et al. 2022 84.592 57.136 2.086 -3.224 -4.004 –
Cantat-Gaudin et al. 2020 84.519 57.124 2.052 -3.149 -3.989 –
Cantat-Gaudin & Anders 2020 84.519 57.124 2.052 -3.149 -3.989 –
Bica et al. 2019 84.398 57.174 – – – –
Castro-Ginard et al. 2018 84.37 57.163 2.052 -3.149 -3.999 -5.96

💡 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 0.44 1.16 – 87 -0.132 – – –
Wei et al. 2025 0.68 1.12 – 166 0.250 390 0.34 –
Alfonso et al. 2024 0.50 0.79 – 601 -0.115 – – –
Zhang et al. 2024 – – – – -0.148* – – –
Hunt & Reffert 2024 – – – – – 403* – –
Cavallo et al. 2024 0.50 1.09 – 93 0.290 – – –
Hunt & Reffert 2023 0.46 1.08 1.38 198 – – – –
Qin et al. 2023 0.78 1.27 – 158 – – – –
He et al. 2022 – 1.30 – 141 – – – –
Tarricq et al. 2022 0.49 – – 513 – – – –
Cantat-Gaudin et al. 2020 0.50 0.79 – 501 – – – –
Cantat-Gaudin & Anders 2020 0.48 – – – – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
LISC-III 3517 94.6 84.3 57.16 2.07 -3.16 -3.93 -6.33 0.29

💡 Note: The % column shows the percentage of members that UBC 8 shares with each listed object.

Visualization
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UBC 8 UCC
UBC 8 HUNT23
UBC 8 CANTAT20
Galactocentric position diagram