COIN-Gaia 18

(COIN 18)

0.77 UTI

0.56

C_N

1.0

C_dens

0.75

C_C3

0.78

C_lit

1.0

C_dup

N₅₀ (P>50% members) 61

Stellar density (N₅₀/rad) 5.7 [N/pc²]

C3 classification AB

C_N 0.56 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.78 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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COIN-Gaia 18 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 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.

Relatively close Low extinction Near-solar metallicity Intermediate age

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.

Cavallo et al. (2024)
Gold sample.

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

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]	B_frac	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	–	–	–	–	–	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	–	–	–	–
Cantat-Gaudin & Anders	2020	1.02	–	–	–	–	–	–	–
Monteiro & Dias	2019	1.19	1.16	–	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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