FSR 0238

(MWSC 3373)

0.52 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

0.65

C_lit

0.64

C_dup

N_m (P>50%) 124

Core radius and density 1.3 [pc], 5.6 [pc^-2]

C3 classification AA

C_N 0.76 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.65 Moderately studied
C_dup 0.64 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 0238 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by very high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Relatively close Very high extinction Near-solar metallicity Very young

Li et al. (2026)
Tidal & Core radii: r_t=162+/-51.9 [pc], r_c=0.46+/-0.0 [pc]; stars within r_t: N~653

Palma et al. (2025)
Classified as optical pair P116, along with HSC_630.

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.42 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.42 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3104, e_all=0.4725.

Data

🔍 Search references for FSR 0238 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–	308.633	41.393	0.591	-2.837	-4.528	-27.328
Li et al.	2026	308.31	41.28	–	–	–	–
Zhang et al.	2024	308.71	41.476	–	–	–	–
Hunt & Reffert	2024	308.71	41.476	0.736	0.198	-3.206	-45.925
Cavallo et al.	2024	308.451	41.511	0.736	–	–	–
Hunt & Reffert	2023	308.71	41.476	0.736	0.198	-3.206	-45.925
Just et al.	2023	308.68	41.412	–	–	–	–
Cantat-Gaudin et al.	2020	308.693	41.417	0.596	-2.902	-4.547	–
Zhong et al.	2020	308.693	41.417	–	-2.902	-4.547	26.586
Cantat-Gaudin & Anders	2020	308.693	41.417	0.596	-2.902	-4.547	–
Bica et al.	2019	308.695	41.42	–	–	–	–
Cantat-Gaudin et al.	2018	308.693	41.417	0.596	-2.902	-4.547	–
Dias et al.	2016	308.696	41.416	–	-1.03	-3.55	–
Kharchenko et al.	2016	308.68	41.412	–	–	–	–
Dias et al.	2014	308.696	41.416	–	1.31	-1.6	–
Kharchenko et al.	2013	308.685	41.415	–	-1.03	-3.55	–
Froebrich et al.	2007	308.696	41.416	–	–	–	–

💡 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–	1.6	5.04	2.49	7	0.000	384	–	–
Zhang et al.	2024	–	–	–	–	-0.163⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.31	2.73	2.49	8	–	196⁽¹⁾	–	–
Cavallo et al.	2024	1.65	2.33	–	16	0.820	–	–	–
Hunt & Reffert	2023	1.31	2.73	2.49	8	–	–	–	–
Just et al.	2023	–	–	–	6	–	571	–	–
Tarricq et al.	2022	1.45	–	–	63	–	–	–	–
Cantat-Gaudin et al.	2020	1.53	4.70	–	74	–	–	–	–
Kounkel et al.	2020	1.63	5.71	–	5	–	–	–	–
Zhong et al.	2020	1.60⁽¹⁾	–	–	–	0.000	–	–	–
Cantat-Gaudin & Anders	2020	1.60	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.60	–	–	–	–	–	–	–
Dias et al.	2016	3.09	5.38	–	6	–	–	–	–
Kharchenko et al.	2016	3.09	5.38	–	6	–	–	–	–
Kharchenko et al.	2013	3.09	5.38	–	6	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Cyg OB2	35.5	308.31	41.3	0.58	-2.72	-4.41	-8.19	0.65
Bica 2	27.4	308.31	41.3	0.58	-2.68	-4.41	-13.56	0.03
G 80.35+0.72	4.8	308.43	41.38	0.54	-2.83	-4.13	-4.79	0.03
G80.35+0.72 IR Cl	4.0	308.42	41.38	0.54	-2.81	-4.12	-4.79	0.21

💡 Note: The % column shows the percentage of members that FSR 0238 shares with each listed object.

Visualization

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