FSR 1690

0.06 UTI

0.0

C_N

0.03

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N_m (P>50%) 16

Core radius and density 3.7 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.25 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 1690 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane. It is catalogued as an old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 8 years.

(*): The parallax distance estimate (~2.89 kpc) differs significantly from the median photometric distance (~1.85 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.

Relatively close Old

Data

🔍 Search references for FSR 1690 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–	218.12	-53.687	0.346	-6.448	-1.821	–
Dib et al.	2018	218.083	-53.7	–	–	–	–
Froebrich et al.	2007	218.083	-53.699	–	–	–	–

💡 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–	1.85	–	–	1365	–	–	–	–
Dib et al.	2018	1.85	–	–	1365	–	–	–	–

Visualization

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