FSR 0905

(MWSC 904; FoF 1974)

0.76 UTI

0.78

C_N

0.8

C_dens

0.75

C_C3

0.74

C_lit

1.0

C_dup

N_m (P>50%) 188

Core radius and density 2.0 [pc], 4.0 [pc^-2]

C3 classification AB

C_N 0.78 Rich
C_dens 0.8 Dense
C_C3 0.75 High quality
C_lit 0.74 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 0905 is a rich, dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good 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=0.1749, e_all=0.2457.

Data

🔍 Search references for FSR 0905 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–	98.426	22.328	0.647	1.861	-3.814	3.39
Li et al.	2025	98.442	22.312	0.649	1.965	-3.85	–
Hu & Soubiran	2025	98.43	22.334	–	–	–	–
Yang et al.	2025	98.431	22.313	–	–	–	–
Almeida et al.	2025	98.438	22.31	–	–	–	–
Zhang et al.	2024	98.431	22.313	–	–	–	–
Hunt & Reffert	2024	98.431	22.313	0.644	1.851	-3.805	2.159
Cavallo et al.	2024	98.431	22.334	0.643	–	–	–
Hunt & Reffert	2023	98.431	22.313	0.644	1.851	-3.805	2.159
Almeida et al.	2023	98.429	22.325	–	–	–	–
Just et al.	2023	98.418	22.289	–	–	–	–
Tarricq et al.	2022	98.454	22.333	0.644	1.836	-3.819	–
Jadhav & Subramaniam	2021	98.442	22.312	–	–	–	–
Dias et al.	2021	98.438	22.31	0.647	1.961	-3.849	–
Cantat-Gaudin et al.	2020	98.442	22.312	0.649	1.965	-3.85	–
Zhong et al.	2020	98.442	22.312	–	1.965	-3.85	2.232
Cantat-Gaudin & Anders	2020	98.442	22.312	0.649	1.965	-3.85	–
Liu & Pang	2019	98.425	22.341	0.637	1.887	-3.839	–
Bica et al.	2019	98.442	22.295	–	–	–	–
Cantat-Gaudin et al.	2018	98.442	22.312	0.649	1.965	-3.85	–
Dib et al.	2018	98.427	22.288	–	–	–	–
Joshi et al.	2016	98.427	22.288	–	–	–	–
Kharchenko et al.	2016	98.418	22.289	–	–	–	–
Kharchenko et al.	2013	98.427	22.288	–	0.35	-4.59	–
Froebrich et al.	2007	98.433	22.294	–	–	–	–

💡 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–	1.45	0.515	0.98	417	-0.146	145	0.52	0
Li et al.	2025	1.42	0.42	–	752	-0.146	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.150⁽⁵⁾	–	–	–
Yang et al.	2025	–	–	–	776	-0.190⁽³⁾	–	–	–
Almeida et al.	2025	1.42	0.48	–	643	–	112	–	–
Zhang et al.	2024	–	–	–	–	-0.171⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.45	0.21	0.98	773	–	396⁽¹⁾	–	–
Cavallo et al.	2024	1.24	0.63	–	871	-0.490	–	–	–
Hunt & Reffert	2023	1.45	0.21	0.98	773	–	–	–	–
Almeida et al.	2023	1.41	0.53	–	600	-0.086	145⁽¹⁾	0.52	–
Just et al.	2023	–	–	–	200	–	194	–	–
Tarricq et al.	2022	1.38	–	–	417	–	–	–	–
Jadhav & Subramaniam	2021	1.43	0.50	–	389	–	144	–	0⁽¹⁾
Dias et al.	2021	1.42	0.48	–	643	-0.077	–	–	–
Cantat-Gaudin et al.	2020	1.43	0.50	–	389	–	–	–	–
Kounkel et al.	2020	1.49	0.70	–	302	–	–	–	–
Zhong et al.	2020	1.48⁽¹⁾	1.18	–	8300	-0.108	–	–	–
Cantat-Gaudin & Anders	2020	1.48	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	355	0.250	–	–	–
Cantat-Gaudin et al.	2018	1.48	–	–	–	–	–	–	–
Dib et al.	2018	1.79	–	–	200	–	–	–	–
Joshi et al.	2016	1.79	1.18	–	200	–	–	–	–
Kharchenko et al.	2016	1.79	1.18	–	200	–	–	–	–
Kharchenko et al.	2013	1.79	1.18	–	200	–	–	–	–

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

Visualization

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