FoF 1809

(LP 1809)

0.42 UTI

0.74

C_N

1.0

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

C3 classification CB

Number of members (P>50%) 99

Radius (P>50% members) 4.1 [arcmin]

C_N 0.74 Moderately populated
C_dens 1.0 Very dense
C_C3 0.38 Low quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

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

Overview

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FoF 1809 is a moderately populated, very dense object of low C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Data

🔍 Search references for FoF 1809 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	–	334.709	57.432	0.325	-4.398	-3.551	-60.958
Almeida et al.	2025	334.707	57.426	–	–	–	–
Almeida et al.	2023	334.712	57.426	–	–	–	–
Dias et al.	2021	334.707	57.426	0.342	-4.359	-3.434	-84.263

💡 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
Almeida et al.	2025	2.71	2.73	–	441	–	886	–	–
Almeida et al.	2023	2.60	2.86	–	218	-0.016	487*	0.67	–
Dias et al.	2021	2.71	2.73	–	441	0.092	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 2547	78.8	334.72	57.43	0.32	-4.4	-3.57	-66.8	0.03
OC 0175	45.5	334.72	57.44	0.32	-4.39	-3.59	-72.64	0.0

💡 Note: The % column shows the percentage of members that FoF 1809 shares with each listed object.

Visualization

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