UPK 45

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0.79 UTI
0.64
CN
1.0
Cdens
0.75
CC3
0.79
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 77
Radius (P>50% members) 11.5 [arcmin]
  • CN 0.64 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.79 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 45 is a moderately populated, very dense object of 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, 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 Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 45 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 – 291.708 0.2 1.128 -0.618 -2.158 4.108
Li et al. 2025 291.696 0.212 1.109 -0.697 -2.138 –
Almeida et al. 2025 291.688 0.199 – – – –
Alfonso et al. 2024 291.679 0.036 1.074 -0.608 -2.162 –
Zhang et al. 2024 291.7 0.226 – – – –
Hunt & Reffert 2024 291.7 0.226 1.104 -0.579 -2.17 1.286
Cavallo et al. 2024 291.686 0.03 1.114 – – –
Hunt & Reffert 2023 291.7 0.226 1.104 -0.579 -2.17 1.286
Almeida et al. 2023 291.68 0.19 – – – –
He et al. 2022 291.692 0.247 1.121 -0.607 -2.121 –
Dias et al. 2021 291.688 0.199 1.111 -0.698 -2.088 –
Cantat-Gaudin et al. 2020 291.696 0.212 1.109 -0.697 -2.138 –
Cantat-Gaudin & Anders 2020 291.691 0.205 1.116 -0.714 -2.092 –
Sim et al. 2019 291.569 -0.098 – -0.62 -2.16 –

💡 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 0.79 1.13 – 142 -0.142 – – –
Almeida et al. 2025 0.85 1.26 – 95 – 163 – –
Alfonso et al. 2024 0.90 0.83 – 47 -0.030 – – –
Zhang et al. 2024 – – – – -0.054* – – –
Hunt & Reffert 2024 – – – – – 168* – –
Cavallo et al. 2024 0.85 1.17 – 78 -0.120 – – –
Hunt & Reffert 2023 0.85 0.76 0.57 88 – – – –
Almeida et al. 2023 0.85 1.06 – 191 -0.033 167* 0.72 –
He et al. 2022 – 1.35 – 35 – – – –
Tarricq et al. 2022 0.88 – – 112 – – – –
Dias et al. 2021 0.85 1.26 – 95 -0.030 – – –
Cantat-Gaudin et al. 2020 0.90 0.83 – 105 – – – –
Cantat-Gaudin & Anders 2020 0.87 – – – – – – –
Sim et al. 2019 0.86 – – 79 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 116 94.8 291.7 0.2 1.12 -0.62 -2.15 4.19 0.02
CWWDL 14314 62.3 291.7 0.22 1.13 -0.65 -2.15 4.58 0.0

💡 Note: The % column shows the percentage of members that UPK 45 shares with each listed object.

Visualization
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UPK 45 UCC
UPK 45 HUNT23
UPK 45 CANTAT20
Galactocentric position diagram