FSR 0931

(MWSC 796)

0.51 UTI

0.76

C_N

0.47

C_dens

0.75

C_C3

0.29

C_lit

1.0

C_dup

N_m (P>50%) 134

Core radius and density 2.5 [pc], 2.3 [pc^-2]

C3 classification AB

C_N 0.76 Rich
C_dens 0.47 Loose
C_C3 0.75 High 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 0931 is a rich, loose object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a significant percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P117, along with FSR_0923.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.60 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.60 (50th percentile).

Data

🔍 Search references for FSR 0931 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–	93.349	15.938	0.577	-0.489	-0.981	–
Zhang et al.	2024	93.379	15.94	–	–	–	–
Hunt & Reffert	2024	93.379	15.94	0.58	-0.504	-0.978	–
Cavallo et al.	2024	93.332	15.936	0.58	–	–	–
Hunt & Reffert	2023	93.379	15.94	0.58	-0.504	-0.978	–
Just et al.	2023	93.245	15.931	–	–	–	–
Bica et al.	2019	93.282	15.946	–	–	–	–
Dib et al.	2018	93.252	15.93	–	–	–	–
Joshi et al.	2016	93.252	15.93	–	–	–	–
Kharchenko et al.	2016	93.245	15.931	–	–	–	–
Kharchenko et al.	2013	93.252	15.93	–	0.8	-5.3	–
Froebrich et al.	2007	93.279	15.944	–	–	–	–

💡 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–	1.66	1.84	1.89	25	0.021	318	–	–
Zhang et al.	2024	–	–	–	–	-0.198⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.62	1.43	1.89	73	–	509⁽¹⁾	–	–
Cavallo et al.	2024	1.78	1.71	–	85	0.240	–	–	–
Hunt & Reffert	2023	1.62	1.43	1.89	73	–	–	–	–
Just et al.	2023	–	–	–	25	–	127	–	–
Dib et al.	2018	1.66	–	–	25	–	–	–	–
Joshi et al.	2016	1.66	1.97	–	25	–	–	–	–
Kharchenko et al.	2016	1.66	1.97	–	25	–	–	–	–
Kharchenko et al.	2013	1.66	1.97	–	25	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 201	58.2	93.37	15.93	0.57	-0.48	-0.99	–	0.0
Cmg 955	18.7	93.32	15.94	0.56	-0.5	-0.96	–	0.0

💡 Note: The % column shows the percentage of members that FSR 0931 shares with each listed object.

Visualization

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