UPK 51

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0.72 UTI
0.56
CN
0.64
Cdens
1.0
CC3
0.7
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 63
Radius (P>50% members) 26.7 [arcmin]
  • CN 0.56 Moderately populated
  • Cdens 0.64 Moderately dense
  • CC3 1.0 Very 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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UPK 51 is a moderately populated, moderately dense object of very high C3 quality. Its parallax locates it at a 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 age 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.

Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 51 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 – 314.122 -6.688 1.751 5.082 1.941 -16.053
Li et al. 2025 314.073 -6.588 1.757 5.068 2.018 –
Almeida et al. 2025 314.156 -6.559 – – – –
Alfonso et al. 2024 314.094 -6.693 1.716 5.125 1.945 –
Hunt & Reffert 2024 314.097 -6.718 1.722 5.141 1.977 -17.512
Cavallo et al. 2024 314.161 -6.512 1.733 – – –
Hunt & Reffert 2023 314.097 -6.718 1.722 5.141 1.977 -17.512
He et al. 2022 314.125 -6.683 1.756 5.114 1.933 –
Tarricq et al. 2022 314.122 -6.779 1.74 5.115 1.966 –
Dias et al. 2021 314.156 -6.559 1.741 5.096 2.062 -19.978
Cantat-Gaudin et al. 2020 314.073 -6.588 1.757 5.068 2.018 –
Cantat-Gaudin & Anders 2020 314.073 -6.588 1.748 5.12 2.031 –
Sim et al. 2019 314.102 -6.54 – 5.06 2.07 –

💡 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 0.62 0.08 – 243 0.260 – – –
Almeida et al. 2025 0.57 0.17 – 450 – 88 – –
Alfonso et al. 2024 0.58 0.06 – 87 -0.032 – – –
Hunt & Reffert 2024 – – – – – 40* – –
Cavallo et al. 2024 0.59 0.44 – 79 0.050 – – –
Hunt & Reffert 2023 0.56 0.12 0.80 103 – – – –
He et al. 2022 – 0.15 – 79 – – – –
Tarricq et al. 2022 0.57 – – 110 – – – –
Dias et al. 2021 0.57 0.17 – 450 -0.032 – – –
Cantat-Gaudin et al. 2020 0.58 0.06 – 107 – – – –
Cantat-Gaudin & Anders 2020 0.56 – – – – – – –
Sim et al. 2019 0.57 – – 100 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14526 74.6 314.2 -6.69 1.75 5.11 1.96 -15.95 0.0

💡 Note: The % column shows the percentage of members that UPK 51 shares with each listed object.

Visualization
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UPK 51 UCC
UPK 51 HUNT23
UPK 51 CANTAT20
Galactocentric position diagram