FSR 0331

(MWSC 3640)

0.22 UTI

0.0

C_N

0.12

C_dens

0.25

C_C3

0.38

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 20

Radius (P>50% members) 4.7 [arcmin]

C_N 0.0 Sparse
C_dens 0.12 Very loose
C_C3 0.25 Low quality
C_lit 0.38 Poorly studied
C_dup 1.0 Unique

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

Overview

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FSR 0331 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, well below the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.23 kpc) differs significantly from the median photometric distance (~3.00 kpc).

Note: This object shares a moderate percentage of members with at least one entry reported in the same catalogue. 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 Low extinction Old

Data

🔍 Search references for FSR 0331 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	–	338.633	43.443	0.236	-2.456	-3.065	-48.97
Just et al.	2023	338.678	43.437	–	–	–	–
Bica et al.	2019	338.647	43.428	–	–	–	–
Kharchenko et al.	2016	338.678	43.437	–	–	–	–
Kharchenko et al.	2013	338.685	43.44	–	-3.19	-1.09	–
Kharchenko et al.	2012	338.685	43.44	–	-3.19	-1.09	–
Froebrich et al.	2007	338.65	43.429	–	–	–	–

💡 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
Just et al.	2023	–	–	–	1995	–	628	–	–
Kharchenko et al.	2016	3.00	0.13	–	1995	–	–	–	–
Kharchenko et al.	2013	3.00	0.13	–	1995	–	–	–	–
Kharchenko et al.	2012	3.00	0.13	–	1995	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FSR 0330	36.0	338.52	43.34	0.26	-2.39	-3.17	14.25	0.25

💡 Note: The % column shows the percentage of members that FSR 0331 shares with each listed object.

Visualization

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