FoF 1209

(LP 1209)

0.48 UTI

0.66

C_N

1.0

C_dens

0.75

C_C3

0.0

C_lit

1.0

C_dup

C3 classification BA

Number of members (P>50%) 82

Radius (P>50% members) 3.7 [arcmin]

C_N 0.66 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High 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 1209 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Very young

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

Data

🔍 Search references for FoF 1209 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	–	271.282	-23.801	0.31	-0.041	-1.481	55.793
Almeida et al.	2025	271.296	-23.802	–	–	–	–
He et al.	2023	271.281	-23.794	0.32	-0.025	-1.48	24.76
Dias et al.	2021	271.296	-23.802	0.303	-0.147	-1.522	–

💡 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	2.93	2.95	–	6	–	2129	–	–
He et al.	2023	2.57	2.80	–	200	–	–	–	–
Dias et al.	2021	2.93	2.95	–	6	0.104	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FoF 1211	75.6	271.27	-23.77	0.34	-0.03	-1.48	25.97	0.46
HSC 97	67.1	271.28	-23.82	0.31	-0.02	-1.47	55.79	0.02

💡 Note: The % column shows the percentage of members that FoF 1209 shares with each listed object.

Visualization

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