FSR 1766

(MWSC 2630)

0.23 UTI

0.0

C_N

0.01

C_dens

0.5

C_C3

0.31

C_lit

1.0

C_dup

C3 classification BB

Number of members (P>50%) 13

Radius (P>50% members) 5.0 [arcmin]

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

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

Overview

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FSR 1766 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a very large^* distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~12.58 kpc) differs significantly from the median photometric distance (~3.54 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant High extinction Massive Old

Data

🔍 Search references for FSR 1766 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	–	263.656	-36.707	0.08	-2.579	-5.106	-119.095
Just et al.	2023	263.631	-36.65	–	–	–	–
Bica et al.	2019	263.625	-36.653	–	–	–	–
Kharchenko et al.	2016	263.631	-36.65	–	–	–	–
Kharchenko et al.	2013	263.64	-36.65	–	-4.22	-1.13	–
Froebrich et al.	2007	263.625	-36.65	–	–	–	–

💡 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
Just et al.	2023	–	–	–	1334	–	4355	–	–
Kharchenko et al.	2016	3.54	3.42	–	1334	–	–	–	–
Kharchenko et al.	2013	3.54	3.42	–	1334	–	–	–	–

Visualization

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