FSR 1631

(MWSC 2064)

0.14 UTI

0.0

C_N

0.07

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 22

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 0.12 Very low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

ℹ️

FSR 1631 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 poorly studied in the literature.

(*): The parallax distance estimate (~4.14 kpc) differs significantly from the median photometric distance (~1.46 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 1631 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	191.336	-81.236	0.241	-3.043	-0.269	23.494
Just et al.	2023	191.412	-81.255	–	–	–	–
Kharchenko et al.	2016	191.412	-81.255	–	–	–	–
Kharchenko et al.	2013	191.43	-81.258	–	-6.22	-2.52	–
Froebrich et al.	2007	191.492	-81.248	–	–	–	–

💡 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–	1.46	0.32	–	3162	–	144	–	–
Just et al.	2023	–	–	–	3162	–	144	–	–
Kharchenko et al.	2016	1.46	0.32	–	3162	–	–	–	–
Kharchenko et al.	2013	1.46	0.32	–	3162	–	–	–	–

Visualization

ℹ️