FSR 0166

(MWSC 3286; FoF 47)

0.81 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

0.52

C_lit

1.0

C_dup

N_m (P>50%) 558

Core radius and density 2.7 [pc], 5.8 [pc^-2]

C3 classification AA

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.52 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 0166 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is moderately studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Relatively close Moderate extinction Massive Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1807, e_all=0.0884.

Data

🔍 Search references for FSR 0166 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–	303.381	25.427	0.324	-4.172	-6.67	-10.791
Li et al.	2025	303.385	25.43	0.331	-4.191	-6.659	–
Hu & Soubiran	2025	303.379	25.42	–	–	–	–
Hunt & Reffert	2024	303.406	25.43	0.329	-4.168	-6.668	-11.412
Cavallo et al.	2024	303.379	25.42	0.325	–	–	–
Hunt & Reffert	2023	303.406	25.43	0.329	-4.168	-6.668	-11.412
Just et al.	2023	303.394	25.453	–	–	–	–
Jadhav & Subramaniam	2021	303.385	25.43	–	–	–	–
Cantat-Gaudin et al.	2020	303.385	25.43	0.331	-4.191	-6.659	–
Cantat-Gaudin & Anders	2020	303.385	25.43	0.331	-4.191	-6.659	–
Liu & Pang	2019	303.39	25.425	0.329	-4.14	-6.649	–
Soubiran et al.	2018	303.385	25.43	–	–	–	-12.36
Bica et al.	2019	303.41	25.454	–	–	–	–
Cantat-Gaudin et al.	2018	303.385	25.43	0.331	-4.191	-6.659	–
Dib et al.	2018	303.4	25.455	–	–	–	–
Kharchenko et al.	2016	303.394	25.453	–	–	–	–
Kharchenko et al.	2013	303.4	25.455	–	-3.37	-3.34	–
Froebrich et al.	2007	303.408	25.455	–	–	–	–

💡 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–	2.77	2.73	1.81	1810	-0.021	1053	–	2
Li et al.	2025	2.15	2.48	–	5912	-0.041	–	–	–
Hu & Soubiran	2025	–	–	–	–	0.030⁽⁵⁾	–	–	–
Hunt & Reffert	2024	2.80	2.75	1.81	1102	–	3708⁽¹⁾	–	–
Cavallo et al.	2024	2.54	2.73	–	2692	-0.300	–	–	–
Hunt & Reffert	2023	2.80	2.75	1.81	1102	–	–	–	–
Just et al.	2023	–	–	–	1109	–	247	–	–
Jadhav & Subramaniam	2021	2.81	2.24	–	2818	–	1053	–	2⁽¹⁾
Cantat-Gaudin et al.	2020	2.81	2.24	–	2818	–	–	–	–
Kounkel et al.	2020	2.48	2.29	–	2512	–	–	–	–
Cantat-Gaudin & Anders	2020	2.77	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	2950	0.000	–	–	–
Soubiran et al.	2018	2.77	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.77	–	–	–	–	–	–	–
Dib et al.	2018	1.90	–	–	1109	–	–	–	–
Kharchenko et al.	2016	1.90	2.96	–	1109	–	–	–	–
Kharchenko et al.	2013	1.90	2.96	–	1109	–	–	–	–

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

Visualization

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