FoF 866

(LP 866)

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0.79 UTI
0.77
CN
1.0
Cdens
1.0
CC3
0.6
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 144
Radius (P>50% members) 2.8 [arcmin]
  • CN 0.77 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.6 Moderately 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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FoF 866 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.
Relatively close Moderate extinction Massive Near-solar metallicity Old

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for FoF 866 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 – 261.767 -39.408 0.405 2.925 0.439 -11.101
Li et al. 2025 261.768 -39.405 0.391 2.907 0.48 –
Hu & Soubiran 2025 261.767 -39.403 – – – –
Almeida et al. 2025 261.752 -39.407 – – – –
Hunt & Reffert 2024 261.766 -39.417 0.41 2.905 0.43 -9.002
Cavallo et al. 2024 261.767 -39.403 0.41 – – –
Hunt & Reffert 2023 261.766 -39.417 0.41 2.905 0.43 -9.002
Almeida et al. 2023 261.753 -39.409 – – – –
Dias et al. 2021 261.765 -39.403 0.377 2.938 0.477 -13.185
Cantat-Gaudin et al. 2020 261.768 -39.405 0.391 2.907 0.48 –
Liu & Pang 2019 261.763 -39.404 0.384 2.947 0.487 –

💡 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 1.85 2.12 – 4248 0.156 – – –
Hu & Soubiran 2025 – – – – -0.140* – – –
Almeida et al. 2025 2.22 2.66 – 1242 – 1317 – –
Hunt & Reffert 2024 – – – – – 2113* – –
Cavallo et al. 2024 1.64 2.93 – 2951 -0.660 – – –
Hunt & Reffert 2023 2.24 2.53 1.69 1000 – – – –
Almeida et al. 2023 2.10 2.26 – 3319 0.099 1219* 0.85 –
Dias et al. 2021 2.23 2.18 – 2917 0.094 – – –
Cantat-Gaudin et al. 2020 2.47 2.30 – 1905 – – – –
Liu & Pang 2019 – – – 2510 -0.500 – – –

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

Visualization
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FoF 866 UCC
FoF 866 HUNT23
FoF 866 CANTAT20
Galactocentric position diagram