UPK 303

(OCSN 302)

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0.67 UTI
0.62
CN
0.41
Cdens
1.0
CC3
0.65
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 73
Radius (P>50% members) 96.3 [arcmin]
  • CN 0.62 Moderately populated
  • Cdens 0.41 Loose
  • CC3 1.0 Very high quality
  • Clit 0.65 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 303 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is moderately studied in the literature.
Very close Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data
🔍 Search references for UPK 303 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 – 39.565 40.654 4.702 18.137 -24.384 -8.643
Li et al. 2025 40.054 40.291 4.606 18.197 -24.154 –
Alfonso et al. 2024 40.619 40.232 4.719 18.098 -24.949 –
Zhang et al. 2024 38.631 40.807 – – – –
Cavallo et al. 2024 39.298 40.807 4.683 – – –
Hunt & Reffert 2023 38.631 40.807 4.696 18.21 -23.949 -7.779
Qin et al. 2023 39.16 40.61 4.72 18.13 -24.14 -9.0
He et al. 2022 38.482 40.825 4.696 18.147 -24.353 –
Tarricq et al. 2022 39.53 40.232 4.744 18.097 -24.72 –
Cantat-Gaudin et al. 2020 40.054 40.291 4.606 18.197 -24.154 –
Cantat-Gaudin & Anders 2020 40.054 40.291 4.662 18.261 -24.27 –
Sim et al. 2019 40.177 40.208 – 18.25 -24.33 –

💡 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 0.23 0.23 – 84 0.075 – – –
Alfonso et al. 2024 0.21 0.05 – 88 0.118 – – –
Zhang et al. 2024 – – – – 0.061* – – –
Cavallo et al. 2024 0.22 0.49 – 54 0.090 – – –
Hunt & Reffert 2023 0.22 0.08 0.59 111 – – – –
Qin et al. 2023 0.23 0.31 – 158 – – – –
He et al. 2022 – 0.15 – 63 – – – –
Tarricq et al. 2022 0.20 – – 81 – – – –
Cantat-Gaudin et al. 2020 0.21 0.05 – 79 – – – –
Cantat-Gaudin & Anders 2020 0.21 – – – – – – –
Sim et al. 2019 0.21 – – 89 – – – –

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

Visualization
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UPK 303 UCC
UPK 303 HUNT23
UPK 303 CANTAT20
Galactocentric position diagram