UBC 253

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0.70 UTI
0.57
CN
1.0
Cdens
0.75
CC3
0.6
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 65
Radius (P>50% members) 5.6 [arcmin]
  • CN 0.57 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.6 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 253 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.

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

Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UBC 253 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 – 139.528 -56.009 0.601 -6.066 5.328 13.74
Li et al. 2025 139.532 -56.015 0.576 -6.079 5.305 –
Hu & Soubiran 2025 139.467 -55.957 – – – –
Almeida et al. 2025 139.554 -56.017 – – – –
Hunt & Reffert 2024 139.534 -56.01 0.603 -6.076 5.333 13.159
Cavallo et al. 2024 139.467 -55.957 0.604 – – –
Hunt & Reffert 2023 139.534 -56.01 0.603 -6.076 5.333 13.159
Almeida et al. 2023 139.561 -56.014 – – – –
Dias et al. 2021 139.554 -56.017 0.576 -6.076 5.305 –
Cantat-Gaudin et al. 2020 139.532 -56.015 0.576 -6.079 5.305 –
Castro-Ginard et al. 2020 139.549 -56.024 0.577 -6.099 5.306 –

💡 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 1.44 0.77 – 318 -0.069 – – –
Hu & Soubiran 2025 – – – – -0.220* – – –
Almeida et al. 2025 1.66 0.99 – 206 – 218 – –
Hunt & Reffert 2024 – – – – – 225* – –
Cavallo et al. 2024 1.59 0.66 – 537 0.240 – – –
Hunt & Reffert 2023 1.56 0.49 0.55 270 – – – –
Almeida et al. 2023 1.57 1.05 – 215 -0.064 306* 0.49 –
Dias et al. 2021 1.66 0.99 – 206 0.260 – – –
Cantat-Gaudin et al. 2020 1.57 0.83 – 224 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 212 66.2 139.53 -56.02 0.61 -6.04 5.33 13.74 0.03

💡 Note: The % column shows the percentage of members that UBC 253 shares with each listed object.

Visualization
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UBC 253 UCC
UBC 253 HUNT23
UBC 253 CANTAT20
Galactocentric position diagram