FSR 1521

(SAI 111; MWSC 1727)

0.74 UTI

0.87

C_N

1.0

C_dens

0.75

C_C3

0.55

C_lit

1.0

C_dup

N_m (P>50%) 427

Core radius and density 2.5 [pc], 6.1 [pc^-2]

C3 classification AB

C_N 0.87 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.55 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 1521 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is moderately studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Distant Moderate extinction Massive Near-solar metallicity Old Contains BSS

Almeida et al. (2025)
Mass determination: worst fit. Isochrone match: intermediate fit.

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1401, e_all=0.0198.

Data

🔍 Search references for FSR 1521 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–	148.85	-56.608	0.235	-4.762	4.72	52.392
Almeida et al.	2025	148.846	-56.601	–	–	–	–
Hunt & Reffert	2024	148.83	-56.617	0.251	-4.696	4.799	49.744
Cavallo et al.	2024	148.844	-56.592	0.237	–	–	–
Hunt & Reffert	2023	148.83	-56.617	0.251	-4.696	4.799	49.744
Just et al.	2023	148.824	-56.611	–	–	–	–
Jadhav & Subramaniam	2021	148.852	-56.605	–	–	–	–
Dias et al.	2021	148.846	-56.601	0.189	-4.8	4.595	–
Cantat-Gaudin et al.	2020	148.852	-56.605	0.201	-4.886	4.467	–
Cantat-Gaudin & Anders	2020	148.852	-56.605	0.201	-4.886	4.467	–
Soubiran et al.	2018	148.852	-56.605	–	–	–	55.54
Bica et al.	2019	148.847	-56.608	–	–	–	–
Cantat-Gaudin et al.	2018	148.852	-56.605	0.201	-4.886	4.467	–
Dib et al.	2018	148.83	-56.615	–	–	–	–
Joshi et al.	2016	148.83	-56.615	–	–	–	–
Kharchenko et al.	2016	148.824	-56.611	–	–	–	–
Kharchenko et al.	2013	148.83	-56.615	–	-8.92	6.1	–
Glushkova et al.	2010	148.844	-56.604	–	–	–	–
Froebrich et al.	2007	148.846	-56.602	–	–	–	–

💡 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–	4.205	2.94	2.94	1223	-0.026	2772	–	4
Almeida et al.	2025	6.54	3.20	–	1271	–	2133	–	–
Hunt & Reffert	2024	3.61	3.54	2.94	1507	–	3412⁽¹⁾	–	–
Cavallo et al.	2024	5.78	3.04	–	1175	-0.230	–	–	–
Hunt & Reffert	2023	3.61	3.54	2.94	1507	–	–	–	–
Just et al.	2023	–	–	–	507	–	102	–	–
Jadhav & Subramaniam	2021	4.94	2.72	–	5248	–	23612	–	4⁽¹⁾
Dias et al.	2021	6.54	3.20	–	1271	0.178	–	–	–
Cantat-Gaudin et al.	2020	4.94	2.72	–	5248	–	–	–	–
Kounkel et al.	2020	4.07	3.32	–	457	–	–	–	–
Cantat-Gaudin & Anders	2020	4.34	–	–	–	–	–	–	–
Soubiran et al.	2018	4.34	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.34	–	–	–	–	–	–	–
Dib et al.	2018	1.50	–	–	507	–	–	–	–
Joshi et al.	2016	1.50	1.18	–	507	–	–	–	–
Kharchenko et al.	2016	1.50	1.18	–	507	–	–	–	–
Kharchenko et al.	2013	1.50	1.18	–	507	–	–	–	–
Glushkova et al.	2010	3.98	2.84	–	2818	–	–	–	–

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

Visualization

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