FSR 0904

(SAI 61; MWSC 731; LISC 0296)

0.79 UTI

0.74

C_N

0.65

C_dens

1.0

C_C3

0.77

C_lit

1.0

C_dup

N_m (P>50%) 97

Core radius and density 1.9 [pc], 3.2 [pc^-2]

C3 classification AA

C_N 0.74 Moderately populated
C_dens 0.65 Moderately dense
C_C3 1.0 Very high quality
C_lit 0.77 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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FSR 0904 is a moderately populated, moderately dense object of very high C3 quality. Its parallax locates it at a moderate 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 age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a very small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

Li et al. (2026)
Tidal & Core radii: r_t=17+/-7.2 [pc], r_c=0.57+/-0.01 [pc]; stars within r_t: N~118

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P112, along with CWNU_2717.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1093, e_all=0.1474.

Data

🔍 Search references for FSR 0904 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–	91.76	19.016	0.46	-0.497	-1.113	35.95
Li et al.	2026	91.76	19.02	–	–	–	–
Schweers & McSwain	2026	91.76	19.02	–	–	–	–
Almeida et al.	2025	91.775	19.024	–	–	–	–
Zhang et al.	2024	91.77	19.014	–	–	–	–
Hunt & Reffert	2024	91.77	19.014	0.473	-0.497	-1.128	37.065
Celli et al.	2024	91.774	19.021	–	–	–	–
Cavallo et al.	2024	91.748	19.015	0.471	–	–	–
Hunt & Reffert	2023	91.77	19.014	0.473	-0.497	-1.128	37.065
Almeida et al.	2023	91.773	19.026	–	–	–	–
Just et al.	2023	91.754	19.023	–	–	–	–
Fu et al.	2022	91.774	19.021	–	–	–	31.742
Dias et al.	2021	91.775	19.024	0.451	-0.441	-1.112	14.007
Cantat-Gaudin et al.	2020	91.774	19.021	0.446	-0.448	-1.107	–
Zhong et al.	2020	91.774	19.021	–	-0.448	-1.107	45.172
Cantat-Gaudin & Anders	2020	91.774	19.021	0.446	-0.448	-1.107	–
Soubiran et al.	2018	91.774	19.021	–	–	–	14.08
Cantat-Gaudin et al.	2018	91.774	19.021	0.446	-0.448	-1.107	–
Dib et al.	2018	91.762	19.022	–	–	–	–
Joshi et al.	2016	91.762	19.022	–	–	–	–
Kharchenko et al.	2016	91.754	19.023	–	–	–	–
Kharchenko et al.	2013	91.762	19.022	–	1.63	-6.72	–
Glushkova et al.	2010	91.73	19.007	–	–	–	–
Froebrich et al.	2007	91.75	19.012	–	–	–	–

💡 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–	2.04	1.86	0.71	63	-0.173	582	0.48	–
Schweers & McSwain	2026	2.27	–	–	251	–	–	–	–
Almeida et al.	2025	1.97	2.14	–	31	–	640	–	–
Zhang et al.	2024	–	–	–	–	-0.199⁽¹⁾	–	–	–
Hunt & Reffert	2024	2.01	1.78	0.71	103	–	582⁽¹⁾	–	–
Celli et al.	2024	–	–	–	22	–	516	–	–
Cavallo et al.	2024	2.23	2.12	–	141	0.140	–	–	–
Hunt & Reffert	2023	2.01	1.78	0.71	103	–	–	–	–
Almeida et al.	2023	2.04	2.20	–	15	-0.096	900⁽¹⁾	0.48	–
Deng & Li	2023	2.29	2.51	–	0	-0.173	–	–	–
Just et al.	2023	–	–	–	63	–	38	–	–
Fu et al.	2022	–	–	–	–	-0.219	–	–	–
Dias et al.	2021	1.97	2.14	–	31	-0.100	–	–	–
Cantat-Gaudin et al.	2020	2.31	1.86	–	22	–	–	–	–
Kounkel et al.	2020	2.19	2.12	–	49	–	–	–	–
Zhong et al.	2020	2.10⁽¹⁾	–	–	–	-0.241	–	–	–
Cantat-Gaudin & Anders	2020	2.10	–	–	–	–	–	–	–
Soubiran et al.	2018	2.10	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.10	–	–	–	–	–	–	–
Dib et al.	2018	1.43	–	–	63	–	–	–	–
Joshi et al.	2016	1.43	1.25	–	63	–	–	–	–
Kharchenko et al.	2016	1.43	1.25	–	63	–	–	–	–
Kharchenko et al.	2013	1.43	1.25	–	63	–	–	–	–
Glushkova et al.	2010	1.26	0.44	–	631	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0317	43.3	91.73	19.02	0.47	-0.5	-1.11	35.95	0.0
FSR 0903	4.1	91.89	19.13	0.41	-0.15	-1.13	14.48	0.47
HSC 1510	1.0	91.9	19.16	0.47	-0.13	-1.1	14.48	0.01

💡 Note: The % column shows the percentage of members that FSR 0904 shares with each listed object.

Visualization

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