FoF 1540

(LP 1540)

0.79 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

0.6

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 122

Radius (P>50% members) 3.3 [arcmin]

C_N 0.76 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.6 Moderately studied
C_dup 1.0 Unique

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

Overview

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FoF 1540 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is moderately 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 Low extinction Near-solar metallicity Old

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for FoF 1540 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	–	170.231	-59.295	0.35	-5.24	1.817	-22.796
Li et al.	2025	170.219	-59.302	0.346	-5.245	1.807	–
Hu & Soubiran	2025	170.212	-59.291	–	–	–	–
Almeida et al.	2025	170.226	-59.302	–	–	–	–
Hunt & Reffert	2024	170.212	-59.301	0.341	-5.261	1.808	-20.544
Cavallo et al.	2024	170.212	-59.291	0.346	–	–	–
Hunt & Reffert	2023	170.212	-59.301	0.341	-5.261	1.808	-20.544
Almeida et al.	2023	170.231	-59.306	–	–	–	–
Dias et al.	2021	170.226	-59.302	0.353	-5.245	1.811	24.983
Cantat-Gaudin et al.	2020	170.219	-59.302	0.346	-5.245	1.807	–
Liu & Pang	2019	170.199	-59.306	0.337	-5.341	1.801	–

💡 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
Li et al.	2025	2.57	0.88	–	1536	-0.228	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.290*	–	–	–
Almeida et al.	2025	2.37	0.81	–	1387	–	301	–	–
Hunt & Reffert	2024	–	–	–	–	–	649*	–	–
Cavallo et al.	2024	2.23	0.81	–	1413	0.050	–	–	–
Hunt & Reffert	2023	2.65	0.55	0.48	1052	–	–	–	–
Almeida et al.	2023	2.45	0.81	–	1449	-0.008	934*	0.64	–
Dias et al.	2021	2.37	0.81	–	1387	-0.090	–	–	–
Cantat-Gaudin et al.	2020	2.54	0.49	–	1622	–	–	–	–
Liu & Pang	2019	–	–	–	1020	0.500	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 271	79.5	170.23	-59.3	0.35	-5.24	1.82	-22.8	0.0
CWWDL 2753	18.0	170.23	-59.29	0.35	-5.35	1.82	-21.18	0.04

💡 Note: The % column shows the percentage of members that FoF 1540 shares with each listed object.

Visualization

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