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
📥 Members 📊 Colab 🔬 Bayestar19 🔍 SciX 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview
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
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
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 –
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 – – – –
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 – – – –
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 – – – –

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): 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
FSR 0850 UCC
FSR 0850 HUNT23
FSR 0850 CANTAT20
Galactocentric position diagram

💡 Note: How are the galactocentric plots generated? See FAQ.