FSR 1638

(MWSC 2079)

0.19 UTI

0.0

C_N

0.09

C_dens

0.25

C_C3

0.31

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 16

Radius (P>50% members) 6.6 [arcmin]

C_N 0.0 Sparse
C_dens 0.09 Very loose
C_C3 0.25 Low quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

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

Overview

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FSR 1638 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by low extinction. It is catalogued as an extremely massive, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.09 kpc) differs significantly from the median photometric distance (~7.70 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.

Very distant Low extinction Extremely massive Old

Data

🔍 Search references for FSR 1638 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	–	195.397	-71.418	0.323	-8.212	-0.197	-39.665
Just et al.	2023	195.265	-71.392	–	–	–	–
Bica et al.	2019	195.303	-71.397	–	–	–	–
Kharchenko et al.	2016	195.265	-71.392	–	–	–	–
Kharchenko et al.	2013	195.277	-71.395	–	-1.89	1.44	–
Froebrich et al.	2007	195.308	-71.395	–	–	–	–

💡 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	–	–	–	3162	–	10116	–	–
Kharchenko et al.	2016	7.70	0.64	–	3162	–	–	–	–
Kharchenko et al.	2013	7.70	0.64	–	3162	–	–	–	–

Visualization

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