FSR 1621

(MWSC 2058)

0.32 UTI

0.0

C_N

0.37

C_dens

0.62

C_C3

0.29

C_lit

1.0

C_dup

N_m (P>50%) 22

Core radius and density 1.0 [pc], 1.9 [pc^-2]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.37 Loose
C_C3 0.62 Intermediate quality
C_lit 0.29 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 1621 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a relatively close^* distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~1.49 kpc) differs significantly from the median photometric distance (~1.01 kpc).

Relatively close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.89 (50th percentile).

Data

🔍 Search references for FSR 1621 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–	189.815	-57.409	0.672	-7.249	-1.706	-15.284
Hu & Soubiran	2025	189.799	-57.417	–	–	–	–
Hunt & Reffert	2024	189.817	-57.405	0.664	-7.201	-1.704	-15.737
Cavallo et al.	2024	189.799	-57.417	0.672	–	–	–
Hunt & Reffert	2023	189.817	-57.405	0.664	-7.201	-1.704	-15.737
Just et al.	2023	189.838	-57.376	–	–	–	–
Bica et al.	2019	189.845	-57.374	–	–	–	–
Dib et al.	2018	189.847	-57.38	–	–	–	–
Joshi et al.	2016	189.847	-57.38	–	–	–	–
Kharchenko et al.	2016	189.838	-57.376	–	–	–	–
Kharchenko et al.	2013	189.847	-57.38	–	-8.57	2.05	–
Froebrich et al.	2007	189.838	-57.376	–	–	–	–

💡 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–	1.01	0.63	0.67	100	-0.040	50	–	–
Hu & Soubiran	2025	–	–	–	–	-0.270⁽⁵⁾	–	–	–
Hunt & Reffert	2024	1.42	0.60	0.67	490	–	66⁽¹⁾	–	–
Cavallo et al.	2024	1.41	0.34	–	617	0.190	–	–	–
Hunt & Reffert	2023	1.42	0.59	0.67	490	–	–	–	–
Just et al.	2023	–	–	–	100	–	34	–	–
Dib et al.	2018	1.01	–	–	100	–	–	–	–
Joshi et al.	2016	1.01	0.66	–	100	–	–	–	–
Kharchenko et al.	2016	1.01	0.66	–	100	–	–	–	–
Kharchenko et al.	2013	1.01	0.66	–	100	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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