FSR 1577

(MWSC 1673)

0.08 UTI

0.0

C_N

0.01

C_dens

0.12

C_C3

0.13

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 4.7 [pc], 0.07 [pc^-2]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.12 Very low quality
C_lit 0.13 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 1577 is a sparse, very loose object of very 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 rarely studied in the literature.

(*): The parallax distance estimate (~3.89 kpc) differs significantly from the median photometric distance (~1.56 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.

Relatively close Low extinction Old

Data

🔍 Search references for FSR 1577 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–	142.304	-76.105	0.257	-6.381	4.519	43.302
Just et al.	2023	142.193	-76.082	–	–	–	–
Dib et al.	2018	142.192	-76.085	–	–	–	–
Joshi et al.	2016	142.192	-76.085	–	–	–	–
Kharchenko et al.	2016	142.193	-76.082	–	–	–	–
Kharchenko et al.	2013	142.192	-76.085	–	-4.92	1.35	–
Froebrich et al.	2007	142.096	-76.097	–	–	–	–

💡 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–	1.56	0.33	–	3981	–	169	–	–
Just et al.	2023	–	–	–	3981	–	169	–	–
Dib et al.	2018	1.56	–	–	3981	–	–	–	–
Joshi et al.	2016	1.56	0.33	–	3981	–	–	–	–
Kharchenko et al.	2016	1.56	0.33	–	3981	–	–	–	–
Kharchenko et al.	2013	1.56	0.33	–	3981	–	–	–	–

Visualization

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