FSR 0866

(MWSC 1022; FoF 2044)

0.96 UTI

0.8

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 242

Radius (P>50% members) 8.6 [arcmin]

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

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

Overview

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FSR 0866 is a rich, very dense object of very 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, old cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is very well-studied in the literature.

Relatively close Low extinction Near-solar metallicity Old

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for FSR 0866 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	–	103.832	29.751	0.8	1.37	-0.388	65.572
Li et al.	2025	103.823	29.745	0.812	1.405	-0.443	–
Hu & Soubiran	2025	103.832	29.756	–	–	–	–
Almeida et al.	2025	103.825	29.748	–	–	–	–
Zhang et al.	2024	103.836	29.741	–	–	–	–
Hunt & Reffert	2024	103.836	29.741	0.802	1.359	-0.388	65.252
Cavallo et al.	2024	103.832	29.756	0.802	–	–	–
Hunt & Reffert	2023	103.836	29.741	0.802	1.359	-0.388	65.252
Just et al.	2023	103.806	29.732	–	–	–	–
He et al.	2022	103.834	29.744	0.803	1.366	-0.389	–
Tarricq et al.	2022	103.83	29.747	0.794	1.366	-0.398	–
Dias et al.	2021	103.825	29.748	0.814	1.407	-0.426	65.554
Cantat-Gaudin et al.	2020	103.823	29.745	0.812	1.405	-0.443	–
Cantat-Gaudin & Anders	2020	103.823	29.745	0.812	1.405	-0.443	–
Liu & Pang	2019	103.823	29.765	0.796	1.401	-0.362	–
Bossini et al.	2019	103.823	29.745	–	–	–	–
Soubiran et al.	2018	103.823	29.745	–	–	–	65.47
Bica et al.	2019	103.825	29.738	–	–	–	–
Cantat-Gaudin et al.	2018	103.823	29.745	0.812	1.405	-0.443	–
Kharchenko et al.	2016	103.806	29.732	–	–	–	–
Kharchenko et al.	2013	103.815	29.73	–	-1.19	-1.0	0.7
Froebrich et al.	2007	103.821	29.738	–	–	–	–

💡 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
Li et al.	2025	1.17	0.18	–	5290	-0.199	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.200*	–	–	–
Almeida et al.	2025	1.22	0.19	–	3707	–	163	–	–
Zhang et al.	2024	–	–	–	–	-0.168*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	640*	–	–
Cavallo et al.	2024	1.22	0.00	–	3388	0.360	–	–	–
Hunt & Reffert	2023	1.16	0.10	0.78	2104	–	–	–	–
Just et al.	2023	–	–	–	1585	–	177	–	–
He et al.	2022	–	0.15	–	3981	–	–	–	–
Tarricq et al.	2022	1.21	–	–	2042	–	–	–	–
Dias et al.	2021	1.22	0.19	–	3707	-0.060	–	–	–
Cantat-Gaudin et al.	2020	1.25	0.29	–	2138	–	–	–	–
Cantat-Gaudin & Anders	2020	1.19	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	2820	0.000	–	–	–
Bossini et al.	2019	1.50	0.49	–	1799	0.000	–	–	–
Soubiran et al.	2018	1.19	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.19	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.66	0.90	–	1585	–	–	–	–
Kharchenko et al.	2013	1.66	0.90	–	1585	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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