UPK 42

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0.85 UTI
0.77
CN
1.0
Cdens
1.0
CC3
0.75
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 148
Radius (P>50% members) 15.4 [arcmin]
  • CN 0.77 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.75 Well-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 42 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by moderate 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 well-studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 42 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 – 293.933 -3.652 1.691 -0.449 -5.023 3.984
Li et al. 2025 293.908 -3.653 1.657 -0.452 -5.002 –
Almeida et al. 2025 293.926 -3.666 – – – –
Alfonso et al. 2024 293.926 -3.652 1.648 -0.43 -5.038 –
Hunt & Reffert 2024 293.918 -3.666 1.687 -0.425 -5.022 7.423
Cavallo et al. 2024 293.928 -3.644 1.687 – – –
Hunt & Reffert 2023 293.918 -3.666 1.687 -0.425 -5.022 7.423
Almeida et al. 2023 293.937 -3.682 – – – –
He et al. 2022 293.922 -3.665 1.692 -0.431 -5.03 –
Tarricq et al. 2022 293.91 -3.614 1.682 -0.449 -5.056 –
Dias et al. 2021 293.926 -3.666 1.663 -0.44 -5.0 –
Cantat-Gaudin et al. 2020 293.908 -3.653 1.657 -0.452 -5.002 –
Cantat-Gaudin & Anders 2020 293.906 -3.648 1.666 -0.46 -4.999 –
Sim et al. 2019 293.92 -3.643 – -0.46 -5.03 –

💡 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 0.55 1.58 – 110 -0.056 – – –
Almeida et al. 2025 0.59 1.68 – 115 – 266 – –
Alfonso et al. 2024 0.60 1.06 – 618 -0.036 – – –
Hunt & Reffert 2024 – – – – – 292* – –
Cavallo et al. 2024 0.60 1.57 – 186 0.090 – – –
Hunt & Reffert 2023 0.56 1.56 1.77 198 – – – –
Almeida et al. 2023 0.58 1.71 – 268 -0.099 229* 0.60 –
He et al. 2022 – 1.95 – 56 – – – –
Tarricq et al. 2022 0.59 – – 229 – – – –
Dias et al. 2021 0.59 1.68 – 115 -0.036 – – –
Cantat-Gaudin et al. 2020 0.60 1.06 – 209 – – – –
Cantat-Gaudin & Anders 2020 0.59 – – – – – – –
Sim et al. 2019 0.59 – – 562 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 115 100.0 293.93 -3.65 1.68 -0.46 -5.03 3.58 0.12
LISC-III 3263 90.5 293.94 -3.65 1.69 -0.43 -5.0 6.86 0.03

💡 Note: The % column shows the percentage of members that UPK 42 shares with each listed object.

Visualization
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UPK 42 UCC
UPK 42 HUNT23
UPK 42 CANTAT20
Galactocentric position diagram