UPK 398

(OCSN 308)

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0.85 UTI
0.66
CN
1.0
Cdens
1.0
CC3
0.79
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 83
Radius (P>50% members) 15.5 [arcmin]
  • CN 0.66 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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 398 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a very 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 absorption parameter (see Parameters). It is well-studied in the literature.
Very close Low extinction Near-solar metallicity Very 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 398 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 – 86.019 7.035 2.24 -3.26 -1.781 29.613
Li et al. 2025 85.994 7.021 2.176 -3.315 -1.714 –
Almeida et al. 2025 85.989 7.063 – – – –
Alfonso et al. 2024 85.995 7.024 2.2 -3.213 -1.777 –
Zhang et al. 2024 85.956 7.059 – – – –
Hunt & Reffert 2024 85.956 7.059 2.251 -3.257 -1.748 25.231
Celli et al. 2024 85.994 7.021 – – – –
Cavallo et al. 2024 86.093 7.006 2.255 – – –
Hunt & Reffert 2023 85.956 7.059 2.251 -3.257 -1.748 25.231
Qin et al. 2023 85.96 7.04 2.26 -3.27 -1.74 27.92
He et al. 2022 86.057 7.039 2.26 -3.232 -1.761 –
Dias et al. 2021 85.989 7.063 2.172 -3.298 -1.747 30.658
Cantat-Gaudin et al. 2020 85.994 7.021 2.176 -3.315 -1.714 –
Cantat-Gaudin & Anders 2020 85.984 7.02 2.196 -3.276 -1.737 –
Sim et al. 2019 86.012 7.027 – -3.34 -1.76 –

💡 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 0.49 0.45 – 5 -0.174 – – –
Almeida et al. 2025 0.45 0.47 – 14 – 65 – –
Alfonso et al. 2024 0.45 0.38 – 11 0.007 – – –
Zhang et al. 2024 – – – – 0.059* – – –
Hunt & Reffert 2024 – – – – – 51* – –
Celli et al. 2024 – – – 11 – 57 – –
Cavallo et al. 2024 0.49 1.00 – 4 -0.030 – – –
Hunt & Reffert 2023 0.43 0.80 1.03 12 – – – –
Qin et al. 2023 0.50 0.31 – 7 – – – –
He et al. 2022 – 0.05 – 9 – – – –
Dias et al. 2021 0.45 0.47 – 14 0.007 – – –
Cantat-Gaudin et al. 2020 0.45 0.38 – 11 – – – –
Cantat-Gaudin & Anders 2020 0.45 – – – – – – –
Sim et al. 2019 0.45 – – 13 – – – –

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

Visualization
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UPK 398 UCC
UPK 398 HUNT23
UPK 398 CANTAT20
Galactocentric position diagram