FSR 1521

(SAI 111; MWSC 1727)

0.85 UTI

0.87

C_N

1.0

C_dens

0.75

C_C3

0.82

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 427

Radius (P>50% members) 3.1 [arcmin]

C_N 0.87 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.82 Well-studied
C_dup 1.0 Unique

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

Overview

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 mass parameter (see Parameters). It is well-studied in the literature.

Distant Moderate extinction Massive Near-solar metallicity Old

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

Cavallo et al. (2024): Bronze sample.

Data

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	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	–	–	–	–
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	–
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	–
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]	Bfr	BSS
Almeida et al.	2025	6.54	3.20	–	1271	–	2133	–	–
Hunt & Reffert	2024	–	–	–	–	–	3412*	–	–
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	–	–
Dias et al.	2021	6.54	3.20	–	1271	0.178	–	–	–
Cantat-Gaudin et al.	2020	4.94	2.72	–	5248	–	–	–	–
Soubiran et al.	2018	4.34	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.34	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.50	1.16	–	507	–	–	–	–
Kharchenko et al.	2013	1.50	1.16	–	507	–	–	–	–
Glushkova et al.	2010	3.98	2.79	–	2818	–	–	–	–

💡 Note: The parameters are sometimes transformed from their original values to match the format of the columns shown here, see FAQ. The columns DAv, Bfr, BSS correspond to differential extinction, binary fraction, and blue stragglers, respectively. BSS values can be listed as fractions or integers.
(*): indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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💡 Note: How are the galactocentric plots generated? See FAQ.