FSR 1209

(MWSC 1105)

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0.80 UTI
0.75
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 100
Radius (P>50% members) 2.4 [arcmin]
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.75 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 1209 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by moderate 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.
Distant Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for FSR 1209 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 – 106.785 -13.829 0.19 -0.944 0.715 77.847
Li et al. 2025 106.785 -13.827 0.19 -0.928 0.689 –
Hunt & Reffert 2024 106.788 -13.825 0.211 -0.955 0.727 –
Cavallo et al. 2024 106.79 -13.834 0.21 – – –
Hunt & Reffert 2023 106.788 -13.825 0.211 -0.955 0.727 –
Just et al. 2023 106.761 -13.818 – – – –
Cantat-Gaudin et al. 2020 106.785 -13.827 0.19 -0.928 0.689 –
Cantat-Gaudin & Anders 2020 106.785 -13.827 0.19 -0.928 0.689 –
Bica et al. 2019 106.765 -13.844 – – – –
Cantat-Gaudin et al. 2018 106.785 -13.827 0.19 -0.928 0.689 –
Kharchenko et al. 2016 106.761 -13.818 – – – –
Kharchenko et al. 2013 106.767 -13.82 – -0.89 -2.49 –
Froebrich et al. 2007 106.767 -13.848 – – – –
Dias et al. 2002 106.767 -13.848 – -0.89 -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 5.64 1.38 – 535 0.063 – – –
Hunt & Reffert 2024 – – – – – 716* – –
Cavallo et al. 2024 3.58 1.66 – 331 -0.420 – – –
Hunt & Reffert 2023 4.36 1.39 0.83 180 – – – –
Just et al. 2023 – – – 1318 – 1045 – –
Cantat-Gaudin et al. 2020 5.47 1.30 – 282 – – – –
Cantat-Gaudin & Anders 2020 4.58 – – – – – – –
Cantat-Gaudin et al. 2018 4.58 – – – – – – –
Kharchenko et al. 2016 2.96 1.35 – 1318 – – – –
Kharchenko et al. 2013 2.96 1.35 – 1318 – – – –
Dias et al. 2002 2.96 1.35 – 1318 – – – –

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

Visualization
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FSR 1209 UCC
FSR 1209 HUNT23
FSR 1209 CANTAT20
Galactocentric position diagram