UPK 540

(OCSN 313)

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0.74 UTI
0.75
CN
0.63
Cdens
1.0
CC3
0.65
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 104
Radius (P>50% members) 53.9 [arcmin]
  • CN 0.75 Rich
  • Cdens 0.63 Moderately dense
  • CC3 1.0 Very high quality
  • Clit 0.65 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 540 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is moderately studied in the literature.

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

Very close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data
🔍 Search references for UPK 540 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 – 114.668 -58.722 2.727 -4.857 7.754 6.804
Li et al. 2025 114.567 -58.609 2.688 -4.827 7.67 –
Almeida et al. 2025 114.535 -58.435 – – – –
Alfonso et al. 2024 114.649 -58.711 2.71 -4.81 7.77 –
Cavallo et al. 2024 114.839 -58.81 2.719 – – –
Hunt & Reffert 2023 115.516 -58.662 2.718 -4.841 7.689 7.935
Qin et al. 2023 115.07 -58.65 2.71 -4.8 7.71 6.71
He et al. 2022 114.801 -58.752 2.743 -4.769 7.759 –
Dias et al. 2021 114.535 -58.435 2.663 -4.815 7.661 14.456
Cantat-Gaudin et al. 2020 114.567 -58.609 2.688 -4.827 7.67 –
Cantat-Gaudin & Anders 2020 114.614 -58.613 2.693 -4.921 7.663 –
Sim et al. 2019 114.693 -58.54 – -4.82 7.66 –

💡 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 0.36 0.44 – 29 0.049 – – –
Almeida et al. 2025 0.36 0.45 – 33 – 55 – –
Alfonso et al. 2024 0.36 0.32 – 31 -0.008 – – –
Cavallo et al. 2024 0.38 0.68 – 9 -0.250 – – –
Hunt & Reffert 2023 0.36 0.25 0.47 20 – – – –
Qin et al. 2023 0.43 0.43 – 28 – – – –
He et al. 2022 – 0.50 – 28 – – – –
Dias et al. 2021 0.36 0.45 – 33 -0.008 – – –
Cantat-Gaudin et al. 2020 0.36 0.32 – 37 – – – –
Cantat-Gaudin & Anders 2020 0.37 – – – – – – –
Sim et al. 2019 0.37 – – 32 – – – –
Cluster % RA DEC Plx pmRA pmDE Rv UTI
HSC 2216 1.0 113.89 -60.6 3.51 -4.64 9.13 20.53 0.11

💡 Note: The % column shows the percentage of members that UPK 540 shares with each listed object.

Visualization
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UPK 540 UCC
UPK 540 HUNT23
UPK 540 CANTAT20
Galactocentric position diagram