COIN-Gaia 40

(COIN 40)

0.69 UTI

0.58

C_N

1.0

C_dens

0.75

C_C3

0.56

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 66

Radius (P>50% members) 4.7 [arcmin]

C_N 0.58 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.56 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 SciX 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

COIN-Gaia 40 is a moderately populated, very dense 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 (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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024): Gold sample.

Data

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	81.897	33.522	0.471	0.338	-2.79	54.239
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	–
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]	Bfr	BSS
Almeida et al.	2025	1.92	1.17	–	144	–	189	–	–
Zhang et al.	2024	–	–	–	–	-0.095*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	268*	–	–
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	–	–	–
Monteiro & Dias	2019	2.17	1.23	–	67	0.014	–	–	–
Cantat-Gaudin et al.	2019	2.00	–	–	–	–	–	–	–

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value 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	0.13

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

Visualization

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💡 Note: How are the galactocentric plots generated? See FAQ.