COIN-Gaia 21

(COIN 21)

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0.77 UTI
0.59
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
N50 (P>50% members) 68
Stellar density (N50/rad) 12.6 [N/pc2]
C3 classification AB
  • CN 0.59 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.75 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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COIN-Gaia 21 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is well-studied in the literature.

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

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 43 along with Theia_1806.

Palma et al. (2025)
Classified as optical pair P3, along with Theia_1806.

Cavallo et al. (2024)
Gold sample.

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

Data
🔍 Search references for COIN-Gaia 21 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– 84.753 28.421 0.7 -0.172 -3.818 1.675
Li et al. 2025 84.766 28.402 0.697 -0.115 -3.849 –
Almeida et al. 2025 84.759 28.387 – – – –
Zhang et al. 2024 84.755 28.437 – – – –
Hunt & Reffert 2024 84.755 28.437 0.695 -0.143 -3.827 -1.68
Celli et al. 2024 84.766 28.402 – – – –
Cavallo et al. 2024 84.745 28.408 0.702 – – –
Hunt & Reffert 2023 84.755 28.437 0.695 -0.143 -3.827 -1.68
Almeida et al. 2023 84.77 28.392 – – – –
Dias et al. 2021 84.759 28.387 0.702 -0.122 -3.807 –
Cantat-Gaudin et al. 2020 84.766 28.402 0.697 -0.115 -3.849 –
Cantat-Gaudin & Anders 2020 84.766 28.402 0.697 -0.115 -3.849 –
Monteiro & Dias 2019 84.766 28.402 – – – 2.546
Cantat-Gaudin et al. 2019 84.766 28.402 0.7 -0.12 -3.82 –

💡 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– 1.34 1.47 1.77 24 -0.029 184 0.63 –
Liu et al. 2025 2.26 0.47 – 32 – – – –
Li et al. 2025 1.20 1.47 – 15 -0.230 – – –
Almeida et al. 2025 1.22 1.50 – 23 – 121 – –
Zhang et al. 2024 – – – – -0.151(1) – – –
Hunt & Reffert 2024 – – – – – 394(1) – –
Celli et al. 2024 – – – 28 – 169 – –
Cavallo et al. 2024 1.29 1.50 – 32 -0.030 – – –
Hunt & Reffert 2023 1.31 1.27 1.77 25 – – – –
Almeida et al. 2023 1.34 1.50 – 17 -0.029 199(1) 0.63 –
Dias et al. 2021 1.22 1.50 – 23 0.003 – – –
Cantat-Gaudin et al. 2020 1.41 1.09 – 28 – – – –
Cantat-Gaudin & Anders 2020 1.38 – – – – – – –
Monteiro & Dias 2019 1.59 1.43 – 17 0.018 – – –
Cantat-Gaudin et al. 2019 1.38 – – – – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 69 91.2 84.75 28.43 0.7 -0.17 -3.81 -10.06 0.06

💡 Note: The % column shows the percentage of members that COIN-Gaia 21 shares with each listed object.

Visualization
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COIN-Gaia 21 UCC
COIN-Gaia 21 HUNT23
COIN-Gaia 21 CANTAT20
Galactocentric position diagram