COIN-Gaia 8

(COIN 8)

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0.84 UTI
0.63
CN
1.0
Cdens
1.0
CC3
0.79
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 76
Radius (P>50% members) 17.4 [arcmin]
  • CN 0.63 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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COIN-Gaia 8 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a close distance, below 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 well-studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for COIN-Gaia 8 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 – 39.024 50.024 1.374 2.414 -2.51 -7.944
Li et al. 2025 39.048 50.013 1.359 2.51 -2.499 –
Almeida et al. 2025 39.145 50.01 – – – –
Alfonso et al. 2024 39.161 50.035 1.332 2.374 -2.513 –
Zhang et al. 2024 39.165 50.01 – – – –
Hunt & Reffert 2024 39.165 50.01 1.379 2.365 -2.527 -8.04
Cavallo et al. 2024 39.177 50.063 1.381 – – –
Hunt & Reffert 2023 39.165 50.01 1.379 2.365 -2.527 -8.04
He et al. 2022 39.189 50.032 1.37 2.39 -2.525 –
Tarricq et al. 2022 39.048 49.89 1.37 2.398 -2.513 –
Dias et al. 2021 39.145 50.01 1.361 2.524 -2.521 -9.303
Cantat-Gaudin et al. 2020 39.048 50.013 1.359 2.51 -2.499 –
Cantat-Gaudin & Anders 2020 39.048 50.013 1.359 2.51 -2.499 –
Monteiro & Dias 2019 39.048 50.013 – – – 2.421
Cantat-Gaudin et al. 2019 39.048 50.013 1.36 2.51 -2.49 –

💡 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 0.72 0.59 – 182 0.061 – – –
Almeida et al. 2025 0.72 0.67 – 169 – 150 – –
Alfonso et al. 2024 0.72 0.37 – 133 -0.018 – – –
Zhang et al. 2024 – – – – -0.199* – – –
Hunt & Reffert 2024 – – – – – 223* – –
Cavallo et al. 2024 0.73 0.63 – 224 0.390 – – –
Hunt & Reffert 2023 0.69 0.39 0.81 176 – – – –
He et al. 2022 – 0.75 – 79 – – – –
Tarricq et al. 2022 0.71 – – 102 – – – –
Dias et al. 2021 0.72 0.67 – 169 -0.018 – – –
Cantat-Gaudin et al. 2020 0.72 0.37 – 100 – – – –
Cantat-Gaudin & Anders 2020 0.72 – – – – – – –
Monteiro & Dias 2019 0.74 0.48 – 263 0.026 – – –
Cantat-Gaudin et al. 2019 0.72 – – – – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 48 78.9 39.07 50.02 1.38 2.42 -2.52 -8.36 0.01
CWWDL 14301 65.8 39.13 50.0 1.38 2.4 -2.52 -9.87 0.02

💡 Note: The % column shows the percentage of members that COIN-Gaia 8 shares with each listed object.

Visualization
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COIN-Gaia 8 UCC
COIN-Gaia 8 HUNT23
COIN-Gaia 8 CANTAT20
Galactocentric position diagram