FSR 0401

(MWSC 3686)

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0.68 UTI
0.73
CN
0.96
Cdens
0.75
CC3
0.48
Clit
1.0
Cdup
Nm (P>50%) 96
Core radius and density 1.2 [pc], 4.8 [pc-2]
C3 classification AB
  • CN 0.73 Moderately populated
  • Cdens 0.96 Very dense
  • CC3 0.75 High quality
  • Clit 0.48 Poorly studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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FSR 0401 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a small percentage of members with a later reported entry. See table with shared members information.

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

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=0.1281, e_all=0.2492.

Data
🔍 Search references for FSR 0401 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– 345.242 59.704 0.281 -3.851 -2.694 -59.206
Almeida et al. 2025 345.243 59.704 – – – –
Hunt & Reffert 2024 345.242 59.697 0.267 -3.839 -2.686 -59.755
Cavallo et al. 2024 345.268 59.699 0.266 – – –
Hunt & Reffert 2023 345.242 59.697 0.267 -3.839 -2.686 -59.755
Just et al. 2023 345.24 59.702 – – – –
Dias et al. 2021 345.243 59.704 0.234 -3.839 -2.639 –
Cantat-Gaudin et al. 2020 345.245 59.698 0.23 -3.837 -2.652 –
Cantat-Gaudin & Anders 2020 345.245 59.698 0.23 -3.837 -2.652 –
Bica et al. 2019 345.224 59.706 – – – –
Cantat-Gaudin et al. 2018 345.245 59.698 0.23 -3.837 -2.652 –
Sampedro et al. 2017 345.229 59.705 – -0.38 -2.26 –
Kharchenko et al. 2016 345.24 59.702 – – – –
Kharchenko et al. 2013 345.247 59.705 – -6.9 2.6 –
Kharchenko et al. 2012 345.247 59.705 – -6.9 2.6 –
Froebrich et al. 2007 345.229 59.705 – – – –
Dias et al. 2002 345.229 59.705 – -1.1 -0.96 –

💡 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– 3.62 3.52 1.265 398 0.144 328 – –
Almeida et al. 2025 4.14 3.05 – 592 – 113 – –
Hunt & Reffert 2024 3.62 3.52 1.27 198 – 633(1) – –
Cavallo et al. 2024 3.53 3.53 – 229 0.200 – – –
Hunt & Reffert 2023 3.62 3.52 1.26 198 – – – –
Just et al. 2023 – – – 398 – 328 – –
Dias et al. 2021 4.14 3.05 – 592 0.089 – – –
Cantat-Gaudin et al. 2020 3.91 3.22 – 269 – – – –
Kounkel et al. 2020 3.11 3.21 – 501 – – – –
Cantat-Gaudin & Anders 2020 3.87 – – – – – – –
Cantat-Gaudin et al. 2018 3.87 – – – – – – –
Kharchenko et al. 2016 3.21 3.61 – 398 – – – –
Kharchenko et al. 2013 3.21 3.61 – 398 – – – –
Kharchenko et al. 2012 3.21 3.61 – 398 – – – –
Dias et al. 2002 3.21 3.61 – 398 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
HSC 860 11.5 345.35 59.67 0.32 -4.0 -2.82 – 0.04

💡 Note: The % column shows the percentage of members that FSR 0401 shares with each listed object.

Visualization
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FSR 0401 UCC
FSR 0401 HUNT23
FSR 0401 CANTAT20
Galactocentric position diagram