FoF 866

(LP 866)

0.77 UTI

0.77

C_N

1.0

C_dens

1.0

C_C3

0.55

C_lit

1.0

C_dup

N₅₀ (P>50% members) 144

Stellar density (N₅₀/rad) 35.6 [N/pc²]

C3 classification AA

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.55 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, 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

Cavallo et al. (2024)
Gold sample.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit. Silver 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	99999–	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]	B_frac	BSS
UCC	99999–	2.22	2.3	1.69	2714	-0.023	1317	0.85	–
Li et al.	2025	1.85	2.12	–	4248	0.156	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Almeida et al.	2025	2.22	2.66	–	1242	–	1317	–	–
Hunt & Reffert	2024	–	–	–	–	–	2113⁽¹⁾	–	–
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⁽¹⁾	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	–	–	–

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

Visualization

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