UPK 654

(OCSN 323)

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0.78 UTI
0.64
CN
1.0
Cdens
1.0
CC3
0.62
Clit
1.0
Cdup
N50 (P>50% members) 77
Stellar density (N50/rad) 10.9 [N/pc2]
C3 classification AA
  • CN 0.64 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.62 Moderately 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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UPK 654 is a moderately populated, very 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, young 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 large percentage of members with a later reported entry. See table with shared members information.

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

Data
🔍 Search references for UPK 654 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– 277.301 -34.542 1.968 1.189 -8.667 0.649
Li et al. 2025 277.329 -34.528 1.97 1.165 -8.67 –
Almeida et al. 2025 277.283 -34.527 – – – –
Alfonso et al. 2024 277.22 -34.52 1.925 1.172 -8.656 –
Almeida et al. 2023 277.208 -34.473 – – – –
Qin et al. 2023 277.35 -34.52 1.95 1.19 -8.71 0.97
He et al. 2022 277.308 -34.502 1.964 1.205 -8.721 –
Tarricq et al. 2022 277.348 -34.451 1.978 1.181 -8.643 –
Dias et al. 2021 277.283 -34.527 1.96 1.157 -8.652 5.384
Cantat-Gaudin et al. 2020 277.329 -34.528 1.97 1.165 -8.67 –
Cantat-Gaudin & Anders 2020 277.32 -34.528 1.967 1.206 -8.621 –
Sim et al. 2019 277.359 -34.49 – 1.13 -8.65 –

💡 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– 0.505 0.505 – 98 -0.046 108 0.5 –
Li et al. 2025 0.52 0.50 – 95 0.057 – – –
Almeida et al. 2025 0.50 0.51 – 133 – 112 – –
Alfonso et al. 2024 0.52 0.16 – 68 -0.046 – – –
Almeida et al. 2023 0.50 0.46 – 329 -0.048 105(1) 0.50 –
Qin et al. 2023 0.69 0.78 – 251 – – – –
He et al. 2022 – 0.60 – 71 – – – –
Tarricq et al. 2022 0.51 – – 83 – – – –
Dias et al. 2021 0.50 0.51 – 133 -0.047 – – –
Cantat-Gaudin et al. 2020 0.52 0.16 – 79 – – – –
Cantat-Gaudin & Anders 2020 0.50 – – – – – – –
Sim et al. 2019 0.50 – – 100 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
LISC 3530 98.7 277.3 -34.54 1.97 1.18 -8.66 -0.0 0.09

💡 Note: The % column shows the percentage of members that UPK 654 shares with each listed object.

Visualization
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UPK 654 UCC
UPK 654 CANTAT20
Galactocentric position diagram