FSR 0850

(MWSC 662; FoF 77)

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0.91 UTI
0.79
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 218
Radius (P>50% members) 5.1 [arcmin]
  • CN 0.79 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 0850 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate 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 age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for FSR 0850 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 – 86.261 24.744 0.444 1.263 -2.528 18.599
Hu & Soubiran 2025 86.273 24.761 – – – –
Almeida et al. 2025 86.266 24.744 – – – –
Zhang et al. 2024 86.241 24.745 – – – –
Hunt & Reffert 2024 86.241 24.745 0.447 1.248 -2.524 15.209
Cavallo et al. 2024 86.274 24.761 0.446 – – –
Hunt & Reffert 2023 86.241 24.745 0.447 1.248 -2.524 15.209
Almeida et al. 2023 86.278 24.753 – – – –
Just et al. 2023 86.271 24.739 – – – –
Dias et al. 2021 86.266 24.744 0.441 1.296 -2.57 16.987
Cantat-Gaudin et al. 2020 86.257 24.74 0.438 1.301 -2.555 –
Cantat-Gaudin & Anders 2020 86.257 24.74 0.438 1.301 -2.555 –
Liu & Pang 2019 86.269 24.76 0.461 1.237 -2.491 –
Dias et al. 2019 86.312 24.754 0.456 1.286 -2.518 19.37
Soubiran et al. 2018 86.257 24.74 – – – 19.24
Cantat-Gaudin et al. 2018 86.257 24.74 0.438 1.301 -2.555 –
Kharchenko et al. 2016 86.271 24.739 – – – –
Kharchenko et al. 2013 86.28 24.738 – 0.07 -3.88 -17.0
Froebrich et al. 2007 86.312 24.754 – – – –
Dias et al. 2002 86.312 24.754 – 0.07 -3.88 –

💡 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
Hu & Soubiran 2025 – – – – -0.160* – – –
Almeida et al. 2025 1.92 1.78 – 219 – 470 – –
Zhang et al. 2024 – – – – -0.278* – – –
Hunt & Reffert 2024 – – – – – 1172* – –
Cavallo et al. 2024 2.07 1.72 – 537 0.080 – – –
Hunt & Reffert 2023 2.04 1.57 2.28 377 – – – –
Almeida et al. 2023 1.89 1.71 – 377 -0.099 513* 0.62 –
Just et al. 2023 – – – 20 – 139 – –
Dias et al. 2021 1.92 1.78 – 219 -0.086 – – –
Cantat-Gaudin et al. 2020 2.23 1.29 – 468 – – – –
Cantat-Gaudin & Anders 2020 2.14 – – – – – – –
Liu & Pang 2019 – – – 1150 -0.500 – – –
Dias et al. 2019 1.86 1.49 – 37 -2.028 – – –
Soubiran et al. 2018 2.14 – – – – – – –
Cantat-Gaudin et al. 2018 2.14 – – – – – – –
Kharchenko et al. 2016 1.84 1.74 – 20 – – – –
Kharchenko et al. 2013 1.84 1.74 – 20 – – – –
Dias et al. 2002 1.84 1.74 – 20 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0299 15.6 86.26 24.75 0.47 1.25 -2.53 18.65 0.0

💡 Note: The % column shows the percentage of members that FSR 0850 shares with each listed object.

Visualization
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FSR 0850 UCC
FSR 0850 HUNT23
FSR 0850 CANTAT20
Galactocentric position diagram