FoF 1800

(LP 1800)

0.75 UTI

0.81

C_N

1.0

C_dens

0.75

C_C3

0.6

C_lit

1.0

C_dup

N₅₀ (P>50% members) 253

Stellar density (N₅₀/rad) 21.3 [N/pc²]

C3 classification AB

C_N 0.81 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.6 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 1800 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for FoF 1800 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–	337.846	58.062	0.7	-4.555	-2.699	-31.475
Li et al.	2025	337.843	58.053	0.705	-4.592	-2.648	–
Wei et al.	2025	337.809	58.056	0.705	-4.554	-2.71	–
Almeida et al.	2025	337.881	58.04	–	–	–	–
Hunt & Reffert	2024	337.824	58.045	0.698	-4.55	-2.706	-34.687
Cavallo et al.	2024	337.83	58.057	0.702	–	–	–
Hunt & Reffert	2023	337.824	58.045	0.698	-4.55	-2.706	-34.687
Almeida et al.	2023	337.898	57.989	–	–	–	–
Tarricq et al.	2022	337.792	58.036	0.707	-4.558	-2.715	–
Dias et al.	2021	337.881	58.04	0.706	-4.591	-2.631	-26.683
Cantat-Gaudin et al.	2020	337.843	58.053	0.705	-4.592	-2.648	–
Liu & Pang	2019	337.809	58.069	0.709	-4.571	-2.633	–

💡 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–	1.34	1.64	1.26	286	0.073	955	0.465	–
Li et al.	2025	1.17	1.36	–	377	0.054	–	–	–
Wei et al.	2025	1.87	1.34	–	576	0.250	893	0.45	–
Almeida et al.	2025	1.26	1.72	–	146	–	850	–	–
Hunt & Reffert	2024	–	–	–	–	–	1065⁽¹⁾	–	–
Cavallo et al.	2024	1.34	1.72	–	240	0.220	–	–	–
Hunt & Reffert	2023	1.35	1.56	1.26	203	–	–	–	–
Almeida et al.	2023	1.33	1.76	–	189	0.038	1017⁽¹⁾	0.48	–
Tarricq et al.	2022	1.35	–	–	355	–	–	–	–
Dias et al.	2021	1.26	1.72	–	146	0.093	–	–	–
Cantat-Gaudin et al.	2020	1.39	1.25	–	331	–	–	–	–
Liu & Pang	2019	–	–	–	479	-1.000	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 170	100.0	337.86	58.06	0.7	-4.56	-2.71	-30.24	0.16

💡 Note: The % column shows the percentage of members that FoF 1800 shares with each listed object.

Visualization

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