UPK 621

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0.74 UTI
0.52
CN
1.0
Cdens
0.75
CC3
0.7
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 55
Radius (P>50% members) 10.0 [arcmin]
  • CN 0.52 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 621 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 low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

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

Close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 621 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 – 237.129 -54.428 1.113 -2.498 -3.122 -1.099
Li et al. 2025 237.093 -54.403 1.122 -2.48 -3.105 –
Almeida et al. 2025 237.199 -54.385 – – – –
Alfonso et al. 2024 237.019 -54.401 1.076 -2.556 -3.086 –
Hunt & Reffert 2024 237.201 -54.415 1.102 -2.471 -3.084 -4.385
Celli et al. 2024 237.093 -54.403 – – – –
Cavallo et al. 2024 237.225 -54.431 1.106 – – –
Hunt & Reffert 2023 237.201 -54.415 1.102 -2.471 -3.084 -4.385
Almeida et al. 2023 237.425 -54.511 – – – –
Dias et al. 2021 237.199 -54.385 1.126 -2.471 -3.101 –
Cantat-Gaudin et al. 2020 237.093 -54.403 1.122 -2.48 -3.105 –
Cantat-Gaudin & Anders 2020 237.087 -54.417 1.111 -2.485 -3.093 –
Sim et al. 2019 237.205 -54.419 – -2.57 -3.08 –

💡 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 0.85 0.83 – 80 -0.040 – – –
Almeida et al. 2025 0.88 0.94 – 36 – 91 – –
Alfonso et al. 2024 0.84 0.66 – 48 0.150 – – –
Hunt & Reffert 2024 – – – – – 127* – –
Celli et al. 2024 – – – 26 – 150 – –
Cavallo et al. 2024 0.92 1.02 – 18 -0.210 – – –
Hunt & Reffert 2023 0.87 0.90 1.08 65 – – – –
Almeida et al. 2023 0.87 1.10 – 149 0.019 488* 0.68 –
Dias et al. 2021 0.88 0.94 – 36 0.150 – – –
Cantat-Gaudin et al. 2020 0.84 0.66 – 26 – – – –
Cantat-Gaudin & Anders 2020 0.88 – – – – – – –
Sim et al. 2019 0.87 – – 631 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14388 65.5 237.18 -54.42 1.11 -2.51 -3.11 -1.1 0.0

💡 Note: The % column shows the percentage of members that UPK 621 shares with each listed object.

Visualization
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UPK 621 UCC
UPK 621 HUNT23
UPK 621 CANTAT20
Galactocentric position diagram