UBC 17 a

(OCSN 283)

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0.55 UTI
0.72
CN
0.56
Cdens
1.0
CC3
0.78
Clit
0.72
Cdup
N50 (P>50% members) 95
Stellar density (N50/rad) 2.8 [N/pc2]
C3 classification AA
  • CN 0.72 Moderately populated
  • Cdens 0.56 Moderately dense
  • CC3 1.0 Very high quality
  • Clit 0.78 Well-studied
  • Cdup 0.72 Likely unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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UBC 17 a is a moderately populated, moderately 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, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UBC 17 a 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 99999– 83.454 -1.709 2.763 1.609 -1.216 17.603
Li et al. 2025 83.422 -1.671 2.753 1.582 -1.2 –
Wei et al. 2025 83.55 -1.438 2.397 -0.301 -0.028 –
Almeida et al. 2025 83.33 -1.606 – – – –
Alfonso et al. 2024 84.653 -1.998 2.705 1.795 -1.118 –
Zhang et al. 2024 84.776 -1.932 – – – –
Hunt & Reffert 2024 84.776 -1.932 2.771 1.801 -1.299 11.737
Celli et al. 2024 83.422 -1.671 – – – –
Cavallo et al. 2024 84.463 -1.821 2.771 – – –
Hunt & Reffert 2023 84.776 -1.932 2.771 1.801 -1.299 11.737
Qin et al. 2023 84.84 -1.73 2.79 1.78 -1.25 19.25
Dias et al. 2021 83.33 -1.606 2.753 1.557 -1.218 22.119
Cantat-Gaudin et al. 2020 83.422 -1.671 2.753 1.582 -1.2 –
Cantat-Gaudin & Anders 2020 83.422 -1.671 2.753 1.582 -1.2 –
Castro-Ginard et al. 2018 83.383 -1.584 2.748 1.593 -1.207 18.96

💡 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] Bfrac BSS
UCC 99999– 0.35 0.51 0.99 11 -0.189 392 0.38 –
Li et al. 2025 0.31 0.14 – 11 -0.153 – – –
Wei et al. 2025 0.24 1.43 – 7 0.500 798 0.38 –
Almeida et al. 2025 0.35 0.51 – 11 – 556 – –
Alfonso et al. 2024 0.33 0.80 – 11 -0.224 – – –
Zhang et al. 2024 – – – – -0.264(1) – – –
Hunt & Reffert 2024 – – – – – 53(1) – –
Celli et al. 2024 – – – 19 – 228 – –
Cavallo et al. 2024 0.36 0.68 – 4 -0.020 – – –
Hunt & Reffert 2023 0.35 0.24 0.99 5 – – – –
Qin et al. 2023 0.40 0.31 – 8 – – – –
Dias et al. 2021 0.35 0.51 – 11 -0.230 – – –
Cantat-Gaudin et al. 2020 0.35 0.80 – 19 – – – –
Cantat-Gaudin & Anders 2020 0.36 – – – – – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
ASCC 19 28.4 82.05 -1.96 2.8 1.15 -1.22 19.28 0.96
OC 0339 8.4 83.1 -0.48 2.75 1.59 -0.98 20.8 0.3
CWWDL 14541 1.1 83.57 -3.18 2.76 1.46 -1.66 15.04 0.17

💡 Note: The % column shows the percentage of members that UBC 17 a shares with each listed object.

Visualization
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UBC 17 a UCC
UBC 17 a HUNT23
UBC 17 a CANTAT20
Galactocentric position diagram