COIN-Gaia 40

(COIN 40)

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0.55 UTI
0.58
CN
0.3
Cdens
0.75
CC3
0.56
Clit
1.0
Cdup
Nm (P>50%) 66
Core radius and density 2.3 [pc], 1.5 [pc-2]
C3 classification AB
  • CN 0.58 Moderately populated
  • Cdens 0.3 Loose
  • CC3 0.75 High quality
  • Clit 0.56 Moderately 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 40 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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 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) 47 along with HSC_1356.

Palma et al. (2025)
Classified as optical pair P280, along with HSC_1356.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg17' along with Gulliver 53, Kronberger 1, NGC 1893 and Stock 8.

Data
🔍 Search references for COIN-Gaia 40 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– 81.897 33.522 0.471 0.338 -2.79 54.239
Li et al. 2025 81.874 33.526 0.47 0.393 -2.762 –
Almeida et al. 2025 81.868 33.498 – – – –
Zhang et al. 2024 81.892 33.515 – – – –
Hunt & Reffert 2024 81.892 33.515 0.455 0.34 -2.779 54.256
Cavallo et al. 2024 81.91 33.536 0.455 – – –
Hunt & Reffert 2023 81.892 33.515 0.455 0.34 -2.779 54.256
Dias et al. 2021 81.868 33.498 0.47 0.391 -2.729 –
Cantat-Gaudin et al. 2020 81.874 33.526 0.47 0.393 -2.762 –
Cantat-Gaudin & Anders 2020 81.874 33.526 0.47 0.393 -2.762 –
Monteiro & Dias 2019 81.874 33.526 – – – 2.271
Cantat-Gaudin et al. 2019 81.874 33.526 0.47 0.39 -2.73 –

💡 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– 2.0 1.04 1.0 144 -0.095 228 – –
Liu et al. 2025 3.18 0.37 – 120 – – – –
Li et al. 2025 1.68 1.04 – 63 -0.359 – – –
Almeida et al. 2025 1.92 1.17 – 144 – 189 – –
Zhang et al. 2024 – – – – -0.095(1) – – –
Hunt & Reffert 2024 2.01 0.81 1.00 214 – 268(1) – –
Cavallo et al. 2024 1.99 0.89 – 479 0.050 – – –
Hunt & Reffert 2023 2.01 0.81 1.00 214 – – – –
Dias et al. 2021 1.92 1.17 – 144 -0.133 – – –
Kounkel et al. 2020 2.59 1.49 – 282 – – – –
Cantat-Gaudin & Anders 2020 2.00 – – – – – – –
Monteiro & Dias 2019 2.17 1.26 – 67 0.014 – – –
Cantat-Gaudin et al. 2019 2.00 – – – – – – –

(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 67 100.0 81.9 33.53 0.47 0.34 -2.78 54.24 0.09

💡 Note: The % column shows the percentage of members that COIN-Gaia 40 shares with each listed object.

Visualization
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COIN-Gaia 40 UCC
COIN-Gaia 40 HUNT23
COIN-Gaia 40 CANTAT20
Galactocentric position diagram