FSR 0581

(MWSC 243)

0.16 UTI

0.26

C_N

0.04

C_dens

0.12

C_C3

0.19

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 1.3 [pc], 0.2 [pc^-2]

C3 classification DC

C_N 0.26 Poorly populated
C_dens 0.04 Very loose
C_C3 0.12 Very low quality
C_lit 0.19 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 0581 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by moderate extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~3.04 kpc) differs significantly from the median photometric distance (~0.93 kpc).

⚠️ 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.

Close Moderate extinction Low mass Intermediate age

Data

🔍 Search references for FSR 0581 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–	44.062	68.826	0.329	-1.024	-0.388	–
Just et al.	2023	44.011	68.824	–	–	–	–
Bica et al.	2019	44.08	68.822	–	–	–	–
Dib et al.	2018	44.026	68.825	–	–	–	–
Joshi et al.	2016	44.026	68.825	–	–	–	–
Kharchenko et al.	2016	44.011	68.824	–	–	–	–
Kharchenko et al.	2013	44.026	68.825	–	0.76	-3.04	–
Kharchenko et al.	2012	44.026	68.825	–	0.76	-3.04	–
Froebrich et al.	2007	44.075	68.819	–	–	–	–

💡 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–	0.93	2.52	–	251	–	18	–	–
Just et al.	2023	–	–	–	251	–	18	–	–
Dib et al.	2018	0.93	–	–	251	–	–	–	–
Joshi et al.	2016	0.93	2.52	–	251	–	–	–	–
Kharchenko et al.	2016	0.93	2.52	–	251	–	–	–	–
Kharchenko et al.	2013	0.93	2.52	–	251	–	–	–	–
Kharchenko et al.	2012	0.93	2.52	–	251	–	–	–	–

Visualization

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