FSR 1212

(MWSC 1115)

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0.50 UTI
0.52
CN
0.31
Cdens
0.75
CC3
0.45
Clit
1.0
Cdup
Nm (P>50%) 55
Core radius and density 2.5 [pc], 1.6 [pc-2]
C3 classification AB
  • CN 0.52 Moderately populated
  • Cdens 0.31 Loose
  • CC3 0.75 High quality
  • Clit 0.45 Poorly studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
FSR 1212 is a moderately populated, loose 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 massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is poorly studied in the literature.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.28 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.28 (50th percentile).

Perren et al. (2022)
A sparse cluster (<100 members) whose overdensity is clearly visible in coordinate space. The CMD shows a well-defined TO at G=17.5, a clear giant branch, and a well-established RC. A slight reddening along the giant branch is consistent with a binary fraction of ~50%. ASteCA gives an age of ~1.3 Gyr and a distance of 10.1 kpc, in good agreement with CG20 (1.4 Gyr, 9.6 kpc). MWSC places the cluster at only 1.8 kpc with an age of 0.4 Gyr, which appears entirely unreliable.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3134, e_all=0.0437.

Data
🔍 Search references for FSR 1212 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– 106.947 -14.145 0.163 -0.339 0.486 –
Hu & Soubiran 2025 106.943 -14.143 – – – –
Hunt & Reffert 2024 106.944 -14.151 0.137 -0.366 0.528 –
Cavallo et al. 2024 106.943 -14.143 0.124 – – –
Hunt & Reffert 2023 106.944 -14.151 0.137 -0.366 0.528 –
Just et al. 2023 106.904 -14.148 – – – –
Perren et al. 2022 106.941 -14.145 – – – –
Jadhav & Subramaniam 2021 106.941 -14.145 – – – –
Cantat-Gaudin et al. 2020 106.941 -14.145 0.216 -0.246 0.314 –
Cantat-Gaudin & Anders 2020 106.941 -14.145 0.216 -0.246 0.314 –
Cantat-Gaudin et al. 2018 106.941 -14.145 0.216 -0.246 0.314 –
Dib et al. 2018 106.909 -14.15 – – – –
Joshi et al. 2016 106.909 -14.15 – – – –
Kharchenko et al. 2016 106.904 -14.148 – – – –
Kharchenko et al. 2013 106.909 -14.15 – 0.93 0.57 –
Froebrich et al. 2007 106.946 -14.149 – – – –

💡 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] Bfrac BSS
UCC 99999– 4.66 1.87 2.07 930 -0.120 1292 0.51 0
Hu & Soubiran 2025 – – – – -0.400(5) – – –
Hunt & Reffert 2024 6.62 1.87 2.07 930 – 1056(1) – –
Cavallo et al. 2024 7.45 1.64 – 1514 -0.110 – – –
Hunt & Reffert 2023 6.62 1.87 2.07 929 – – – –
Just et al. 2023 – – – 447 – 119 – –
Perren et al. 2022 10.05 2.08 – 1259 -0.120 5000 0.51 –
Jadhav & Subramaniam 2021 9.68 1.54 – 1380 – 1527 – 0(1)
Cantat-Gaudin et al. 2020 9.68 1.54 – 1380 – – – –
Kounkel et al. 2020 4.66 1.79 – 1023 – – – –
Cantat-Gaudin & Anders 2020 4.07 – – – – – – –
Cantat-Gaudin et al. 2018 4.07 – – – – – – –
Dib et al. 2018 1.78 – – 447 – – – –
Joshi et al. 2016 1.78 2.43 – 447 – – – –
Kharchenko et al. 2016 1.78 2.43 – 447 – – – –
Kharchenko et al. 2013 1.78 2.43 – 447 – – – –

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

Visualization
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FSR 1212 UCC
FSR 1212 HUNT23
FSR 1212 CANTAT20
Galactocentric position diagram