FSR 0551

(MWSC 131; FoF 2251)

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0.92 UTI
0.84
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 332
Radius (P>50% members) 9.0 [arcmin]
  • CN 0.84 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very 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 0551 is a rich, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is very well-studied in the literature.
Close Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Silver sample.

Data
🔍 Search references for FSR 0551 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 – 24.958 64.848 1.065 0.056 -1.512 -17.497
Li et al. 2025 24.938 64.878 1.063 0.112 -1.422 –
Almeida et al. 2025 24.963 64.87 – – – –
Alfonso et al. 2024 24.885 64.875 1.032 0.023 -1.547 –
Hunt & Reffert 2024 24.954 64.868 1.048 0.042 -1.551 -23.372
Celli et al. 2024 24.938 64.878 – – – –
Cavallo et al. 2024 24.946 64.857 1.066 – – –
Hunt & Reffert 2023 24.954 64.868 1.048 0.042 -1.551 -23.372
Almeida et al. 2023 24.961 64.868 – – – –
He et al. 2022 24.914 64.879 1.07 0.026 -1.556 –
Dias et al. 2021 24.963 64.87 1.053 0.108 -1.403 –
Cantat-Gaudin et al. 2020 24.938 64.878 1.063 0.112 -1.422 –
Cantat-Gaudin & Anders 2020 24.938 64.878 1.063 0.112 -1.422 –
Liu & Pang 2019 24.905 64.85 1.032 0.105 -1.406 –
Dias et al. 2019 24.938 64.711 1.063 0.112 -1.422 -23.49
Soubiran et al. 2018 24.938 64.878 – – – -23.49
Bica et al. 2019 24.936 64.893 – – – –
Cantat-Gaudin et al. 2018 24.938 64.878 1.063 0.112 -1.422 –
Froebrich et al. 2007 24.942 64.895 – – – –
Dias et al. 2002 24.942 64.895 – 1.79 -1.34 –

💡 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 0.73 1.39 – 13 -0.054 – – –
Almeida et al. 2025 0.91 1.63 – 17 – 232 – –
Alfonso et al. 2024 0.98 1.06 – 12 -0.038 – – –
Hunt & Reffert 2024 – – – – – 414* – –
Celli et al. 2024 – – – 14 – 204 – –
Cavallo et al. 2024 1.04 1.86 – 5 -0.210 – – –
Hunt & Reffert 2023 0.92 1.17 1.99 7 – – – –
Almeida et al. 2023 0.89 1.69 – 11 -0.061 95* 0.66 –
He et al. 2022 – 0.10 – 4 – – – –
Dias et al. 2021 0.91 1.63 – 17 -0.038 – – –
Cantat-Gaudin et al. 2020 0.98 1.06 – 13 – – – –
Cantat-Gaudin & Anders 2020 0.92 – – – – – – –
Liu & Pang 2019 – – – 19 -0.250 – – –
Dias et al. 2019 0.83 1.40 – 16 -0.930 – – –
Soubiran et al. 2018 0.92 – – – – – – –
Cantat-Gaudin et al. 2018 0.92 – – – – – – –
Dias et al. 2002 3.50 4.65 – 5 – – – –

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

Visualization
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FSR 0551 UCC
FSR 0551 HUNT23
FSR 0551 CANTAT20
Galactocentric position diagram