UBC 637

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0.53 UTI
0.66
CN
0.43
Cdens
1.0
CC3
0.29
Clit
1.0
Cdup
Nm (P>50%) 82
Core radius and density 2.0 [pc], 2.1 [pc-2]
C3 classification AA
  • CN 0.66 Moderately populated
  • Cdens 0.43 Loose
  • CC3 1.0 Very high quality
  • Clit 0.29 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 637 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption and metallicity parameters (see Parameters). It is poorly studied in the literature.

Note: This object shares a moderate percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.88 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.88 (50th percentile), true positive (human-assigned).

Data
🔍 Search references for UBC 637 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– 123.753 -22.198 0.175 -2.11 2.047 99.727
Li et al. 2025 123.755 -22.189 0.183 -2.149 2.021 –
Hu & Soubiran 2025 123.758 -22.192 – – – –
Almeida et al. 2025 123.748 -22.18 – – – –
Hunt & Reffert 2024 123.753 -22.193 0.169 -2.126 2.038 99.168
Cavallo et al. 2024 123.758 -22.192 0.171 – – –
Hunt & Reffert 2023 123.753 -22.193 0.169 -2.126 2.038 99.168
Jadhav & Subramaniam 2021 123.755 -22.189 – – – –
Dias et al. 2021 123.748 -22.18 0.176 -2.136 2.035 –
Cantat-Gaudin et al. 2020 123.755 -22.189 0.183 -2.149 2.021 –
Castro-Ginard et al. 2020 123.747 -22.175 0.185 -2.137 2.038 –

💡 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– 4.95 0.33 0.55 1871 -0.286 528 – 0
Li et al. 2025 5.33 0.19 – 2262 0.033 – – –
Hu & Soubiran 2025 – – – – -0.270(5) – – –
Almeida et al. 2025 5.11 0.54 – 1871 – 767 – –
Hunt & Reffert 2024 4.95 0.12 0.55 2134 – 528(1) – –
Cavallo et al. 2024 3.24 1.02 – 3631 -1.080 – – –
Hunt & Reffert 2023 4.95 0.12 0.55 2133 – – – –
Jadhav & Subramaniam 2021 4.68 0.33 – 1660 – 358 – 0(1)
Dias et al. 2021 5.11 0.54 – 1871 -0.302 – – –
Cantat-Gaudin et al. 2020 4.68 0.33 – 1660 – – – –
Kounkel et al. 2020 4.84 0.98 – 1000 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 638 30.5 123.75 -22.19 0.15 -2.1 2.06 99.13 0.27

💡 Note: The % column shows the percentage of members that UBC 637 shares with each listed object.

Visualization
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UBC 637 UCC
UBC 637 HUNT23
UBC 637 CANTAT20
Galactocentric position diagram