FoF 1831

(LP 1831)

0.08 UTI

0.0

C_N

0.04

C_dens

0.38

C_C3

0.0

C_lit

1.0

C_dup

C3 classification BC

Number of members (P>50%) 17

Radius (P>50% members) 7.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.04 Very loose
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 1831 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

⚠️ 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 Moderate extinction Near-solar metallicity Very young

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

Data

🔍 Search references for FoF 1831 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	–	359.166	63.499	0.233	-2.641	-0.899	–
Almeida et al.	2025	359.192	63.466	–	–	–	–
Dias et al.	2021	359.192	63.466	0.241	-2.64	-0.906	-72.454
Liu & Pang	2019	359.239	63.481	0.249	-2.606	-0.893	–

💡 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	3.31	2.03	–	16	–	796	–	–
Dias et al.	2021	3.31	2.03	–	16	0.133	–	–	–
Liu & Pang	2019	–	–	–	468	0.250	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 10461	4.0	359.47	63.83	0.26	-2.43	-0.95	-89.84	0.03

💡 Note: The % column shows the percentage of members that FoF 1831 shares with each listed object.

Visualization

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