UPK 445

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0.85 UTI
0.74
CN
1.0
Cdens
1.0
CC3
0.75
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 99
Radius (P>50% members) 15.2 [arcmin]
  • CN 0.74 Moderately populated
  • 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 445 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, very young 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 Low extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 445 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 – 92.393 -15.044 1.475 -2.656 1.385 25.606
Li et al. 2025 92.385 -15.03 1.467 -2.634 1.377 –
Almeida et al. 2025 92.379 -15.068 – – – –
Alfonso et al. 2024 92.273 -15.027 1.451 -2.477 1.433 –
Hunt & Reffert 2024 92.354 -15.039 1.476 -2.538 1.435 24.959
Celli et al. 2024 92.385 -15.03 – – – –
Cavallo et al. 2024 92.512 -14.898 1.468 – – –
Hunt & Reffert 2023 92.354 -15.039 1.476 -2.538 1.435 24.959
Almeida et al. 2023 92.455 -15.034 – – – –
He et al. 2022 92.395 -15.023 1.481 -2.583 1.399 –
Dias et al. 2021 92.379 -15.068 1.471 -2.634 1.358 45.654
Cantat-Gaudin et al. 2020 92.385 -15.03 1.467 -2.634 1.377 –
Cantat-Gaudin & Anders 2020 92.391 -15.029 1.475 -2.631 1.336 –
Sim et al. 2019 92.36 -15.019 – -2.41 1.45 –

💡 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 0.56 0.85 – 24 -0.136 – – –
Almeida et al. 2025 0.66 1.15 – 17 – 158 – –
Alfonso et al. 2024 0.66 0.70 – 18 -0.109 – – –
Hunt & Reffert 2024 – – – – – 85* – –
Celli et al. 2024 – – – 13 – 117 – –
Cavallo et al. 2024 0.74 0.68 – 3 -0.200 – – –
Hunt & Reffert 2023 0.66 0.62 1.13 7 – – – –
Almeida et al. 2023 0.66 0.73 – 15 -0.203 189* 0.55 –
He et al. 2022 – 0.40 – 8 – – – –
Dias et al. 2021 0.66 1.15 – 17 -0.109 – – –
Cantat-Gaudin et al. 2020 0.66 0.70 – 13 – – – –
Cantat-Gaudin & Anders 2020 0.66 – – – – – – –
Sim et al. 2019 0.67 – – 13 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 446 99.0 92.4 -15.05 1.48 -2.66 1.39 25.75 0.08
CWWDL 14263 40.4 92.36 -15.03 1.48 -2.67 1.36 24.07 0.0

💡 Note: The % column shows the percentage of members that UPK 445 shares with each listed object.

Visualization
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UPK 445 UCC
UPK 445 HUNT23
UPK 445 CANTAT20
Galactocentric position diagram