FSR 0905

(MWSC 904; FoF 1974)

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0.91 UTI
0.78
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 188
Radius (P>50% members) 7.7 [arcmin]
  • CN 0.78 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 0905 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is very well-studied in the literature.
Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for FSR 0905 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 – 98.426 22.328 0.647 1.861 -3.814 3.39
Li et al. 2025 98.442 22.312 0.649 1.965 -3.85 –
Hu & Soubiran 2025 98.43 22.334 – – – –
Almeida et al. 2025 98.438 22.31 – – – –
Zhang et al. 2024 98.431 22.313 – – – –
Hunt & Reffert 2024 98.431 22.313 0.644 1.851 -3.805 2.159
Cavallo et al. 2024 98.431 22.334 0.643 – – –
Hunt & Reffert 2023 98.431 22.313 0.644 1.851 -3.805 2.159
Almeida et al. 2023 98.429 22.325 – – – –
Just et al. 2023 98.418 22.289 – – – –
Tarricq et al. 2022 98.454 22.333 0.644 1.836 -3.819 –
Dias et al. 2021 98.438 22.31 0.647 1.961 -3.849 –
Cantat-Gaudin et al. 2020 98.442 22.312 0.649 1.965 -3.85 –
Cantat-Gaudin & Anders 2020 98.442 22.312 0.649 1.965 -3.85 –
Liu & Pang 2019 98.425 22.341 0.637 1.887 -3.839 –
Bica et al. 2019 98.442 22.295 – – – –
Cantat-Gaudin et al. 2018 98.442 22.312 0.649 1.965 -3.85 –
Kharchenko et al. 2016 98.418 22.289 – – – –
Kharchenko et al. 2013 98.427 22.288 – 0.35 -4.59 –
Froebrich et al. 2007 98.433 22.294 – – – –

💡 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 1.42 0.42 – 752 -0.146 – – –
Hu & Soubiran 2025 – – – – -0.150* – – –
Almeida et al. 2025 1.42 0.48 – 643 – 112 – –
Zhang et al. 2024 – – – – -0.171* – – –
Hunt & Reffert 2024 – – – – – 396* – –
Cavallo et al. 2024 1.24 0.63 – 871 -0.490 – – –
Hunt & Reffert 2023 1.45 0.21 0.98 773 – – – –
Almeida et al. 2023 1.41 0.53 – 600 -0.086 145* 0.52 –
Just et al. 2023 – – – 200 – 194 – –
Tarricq et al. 2022 1.38 – – 417 – – – –
Dias et al. 2021 1.42 0.48 – 643 -0.077 – – –
Cantat-Gaudin et al. 2020 1.43 0.50 – 389 – – – –
Cantat-Gaudin & Anders 2020 1.48 – – – – – – –
Liu & Pang 2019 – – – 355 0.250 – – –
Cantat-Gaudin et al. 2018 1.48 – – – – – – –
Kharchenko et al. 2016 1.79 1.16 – 200 – – – –
Kharchenko et al. 2013 1.79 1.16 – 200 – – – –

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

Visualization
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FSR 0905 UCC
FSR 0905 HUNT23
FSR 0905 CANTAT20
Galactocentric position diagram