FSR 1421

(MWSC 1608)

0.15 UTI

0.0

C_N

0.05

C_dens

0.25

C_C3

0.23

C_lit

1.0

C_dup

N_m (P>50%) 17

Core radius and density 3.2 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.25 Low quality
C_lit 0.23 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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FSR 1421 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, above 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 and mass parameters (see Parameters). It is rarely studied in the literature.

⚠️ 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.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P84, along with BH_56.

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.16 (50th percentile).

Data

🔍 Search references for FSR 1421 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–	134.284	-42.506	0.963	-7.115	4.775	30.713
Hunt & Reffert	2024	134.451	-42.656	1.036	-6.716	3.982	13.201
Cavallo et al.	2024	134.56	-42.825	1.067	–	–	–
Hunt & Reffert	2023	134.451	-42.656	1.036	-6.716	3.982	13.201
Just et al.	2023	134.518	-42.597	–	–	–	–
He et al.	2022	134.072	-42.428	0.955	-7.57	5.673	–
Joshi et al.	2016	134.523	-42.6	–	–	–	–
Kharchenko et al.	2016	134.518	-42.597	–	–	–	–
Kharchenko et al.	2013	134.523	-42.6	–	-8.76	9.08	–
Froebrich et al.	2007	134.537	-42.616	–	–	–	–

💡 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–	1.155	2.3	2.75	125	-0.020	115	–	–
Hunt & Reffert	2024	0.90	2.26	2.75	7	–	211⁽¹⁾	–	–
Cavallo et al.	2024	1.04	2.17	–	6	-0.020	–	–	–
Hunt & Reffert	2023	0.90	2.26	2.75	7	–	–	–	–
Just et al.	2023	–	–	–	200	–	19	–	–
He et al.	2022	–	2.45	–	50	–	–	–	–
Joshi et al.	2016	1.27	2.30	–	200	–	–	–	–
Kharchenko et al.	2016	1.27	2.30	–	200	–	–	–	–
Kharchenko et al.	2013	1.27	2.30	–	200	–	–	–	–

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

Visualization

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