UPK 38

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0.73 UTI
0.5
CN
1.0
Cdens
0.75
CC3
0.7
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 50
Radius (P>50% members) 6.1 [arcmin]
  • CN 0.5 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.7 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 38 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately studied in the literature.
Close Moderate extinction Near-solar metallicity Very 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 38 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 – 280.827 -1.639 1.697 -1.091 -5.254 -9.812
Li et al. 2025 280.829 -1.654 1.675 -1.102 -5.202 –
Almeida et al. 2025 280.83 -1.653 – – – –
Alfonso et al. 2024 281.488 -2.085 1.54 0.024 -5.987 –
Celli et al. 2024 280.829 -1.654 – – – –
Cavallo et al. 2024 280.789 -1.605 1.687 – – –
Hunt & Reffert 2023 280.82 -1.643 1.665 -1.173 -5.377 -7.026
Almeida et al. 2023 280.818 -1.648 – – – –
He et al. 2022 280.839 -1.647 1.706 -1.073 -5.333 –
Dias et al. 2021 280.83 -1.653 1.65 -1.088 -5.243 –
Cantat-Gaudin et al. 2020 280.829 -1.654 1.675 -1.102 -5.202 –
Cantat-Gaudin & Anders 2020 280.829 -1.654 1.676 -1.179 -5.134 –
Sim et al. 2019 280.843 -1.654 – -1.11 -5.27 –

💡 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 0.48 2.20 – 18 -0.349 – – –
Almeida et al. 2025 0.59 2.20 – 12 – 94 – –
Alfonso et al. 2024 0.60 2.09 – 14 -0.025 – – –
Celli et al. 2024 – – – 14 – 58 – –
Cavallo et al. 2024 0.66 2.42 – 4 -0.030 – – –
Hunt & Reffert 2023 0.56 1.94 1.82 4 – – – –
Almeida et al. 2023 0.57 2.32 – 11 -0.044 75* 0.68 –
He et al. 2022 – 2.35 – 6 – – – –
Dias et al. 2021 0.59 2.20 – 12 -0.025 – – –
Cantat-Gaudin et al. 2020 0.60 2.09 – 14 – – – –
Cantat-Gaudin & Anders 2020 0.59 – – – – – – –
Sim et al. 2019 0.57 – – 3 – – – –

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

Visualization
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UPK 38 UCC
UPK 38 HUNT23
UPK 38 CANTAT20
Galactocentric position diagram