COIN-Gaia 18

(COIN 18)

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0.50 UTI
0.56
CN
0.3
Cdens
0.75
CC3
0.45
Clit
1.0
Cdup
Nm (P>50%) 61
Core radius and density 2.0 [pc], 1.5 [pc-2]
C3 classification AB
  • CN 0.56 Moderately populated
  • Cdens 0.3 Loose
  • CC3 0.75 High quality
  • Clit 0.45 Poorly 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 18 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 42 along with HSC_1341.

Palma et al. (2025)
Part of multiple system G9, along with HSC_1341 and ASCC_14.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1518, e_all=0.0345.

Data
🔍 Search references for COIN-Gaia 18 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– 78.409 35.503 0.968 0.719 -4.944 3.977
Li et al. 2025 78.408 35.498 0.953 0.767 -4.955 –
Almeida et al. 2025 78.46 35.494 – – – –
Zhang et al. 2024 78.403 35.48 – – – –
Hunt & Reffert 2024 78.403 35.48 0.968 0.705 -4.918 1.454
Cavallo et al. 2024 78.407 35.483 0.967 – – –
Hunt & Reffert 2023 78.403 35.48 0.968 0.705 -4.918 1.454
Almeida et al. 2023 78.417 35.514 – – – –
He et al. 2022 78.363 35.498 0.969 0.738 -4.937 –
Dias et al. 2021 78.46 35.494 0.95 0.762 -4.943 –
Cantat-Gaudin et al. 2020 78.408 35.498 0.953 0.767 -4.955 –
Cantat-Gaudin & Anders 2020 78.408 35.498 0.953 0.767 -4.955 –
Monteiro & Dias 2019 78.408 35.498 – – – 2.402
Cantat-Gaudin et al. 2019 78.408 35.498 0.95 0.77 -4.92 –

💡 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– 1.0 0.965 0.64 178 -0.086 214 0.47 –
Liu et al. 2025 1.55 0.36 – 148 – – – –
Li et al. 2025 0.91 0.93 – 244 -0.078 – – –
Almeida et al. 2025 0.92 1.09 – 159 – 144 – –
Zhang et al. 2024 – – – – -0.158(1) – – –
Hunt & Reffert 2024 0.97 0.76 0.64 268 – 214(1) – –
Cavallo et al. 2024 1.01 0.86 – 288 0.400 – – –
Hunt & Reffert 2023 0.97 0.76 0.64 268 – – – –
Almeida et al. 2023 0.99 1.15 – 188 -0.093 251(1) 0.47 –
He et al. 2022 – 1.00 – 178 – – – –
Tarricq et al. 2022 0.99 – – 174 – – – –
Dias et al. 2021 0.92 1.09 – 159 -0.101 – – –
Cantat-Gaudin et al. 2020 1.03 0.85 – 178 – – – –
Kounkel et al. 2020 1.16 1.16 – 195 – – – –
Cantat-Gaudin & Anders 2020 1.02 – – – – – – –
Monteiro & Dias 2019 1.19 1.18 – 120 0.027 – – –
Cantat-Gaudin et al. 2019 1.02 – – – – – – –

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

Visualization
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COIN-Gaia 18 UCC
COIN-Gaia 18 HUNT23
COIN-Gaia 18 CANTAT20
Galactocentric position diagram