FSR 0166

(MWSC 3286; FoF 47)

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0.93 UTI
1.0
CN
1.0
Cdens
1.0
CC3
0.82
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 558
Radius (P>50% members) 5.4 [arcmin]
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.82 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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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 and metallicity parameters (see Parameters). It is well-studied in the literature.
Relatively close Moderate extinction Massive Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

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 – 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 – – – –
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 –
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] Bfr BSS
Li et al. 2025 2.15 2.48 – 5912 -0.041 – – –
Hu & Soubiran 2025 – – – – 0.030* – – –
Hunt & Reffert 2024 – – – – – 3708* – –
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 – –
Cantat-Gaudin et al. 2020 2.81 2.24 – 2818 – – – –
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 – – – – – – –
Kharchenko et al. 2016 1.90 2.90 – 1109 – – – –
Kharchenko et al. 2013 1.90 2.90 – 1109 – – – –

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

Visualization
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FSR 0166 UCC
FSR 0166 HUNT23
FSR 0166 CANTAT20
Galactocentric position diagram