NGC 6866

(MWSC 3239; FoF 2040)

0.97 UTI

0.84

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 343

Stellar density (N₅₀/rad) 21.3 [N/pc²]

C3 classification AA

C_N 0.84 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

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

Overview

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NGC 6866 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, intermediate-age cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Relatively close Low extinction Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for NGC 6866 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–	300.98	44.171	0.688	-1.369	-5.764	13.807
Li et al.	2025	300.983	44.158	0.686	-1.365	-5.743	–
Hu & Soubiran	2025	301.002	44.186	–	–	–	–
Almeida et al.	2025	300.983	44.16	–	–	–	–
Zhang et al.	2024	300.982	44.166	–	–	–	–
Hunt & Reffert	2024	300.982	44.166	0.692	-1.372	-5.764	15.177
Cavallo et al.	2024	301.002	44.186	0.69	–	–	–
Hunt & Reffert	2023	300.982	44.166	0.692	-1.372	-5.764	15.177
Almeida et al.	2023	300.971	44.16	–	–	–	–
Just et al.	2023	300.982	44.158	–	–	–	–
Tarricq et al.	2022	300.946	44.171	0.687	-1.375	-5.771	–
Jaehnig et al.	2021	300.986	44.164	0.716	-1.379	-5.737	–
Rain et al.	2021	300.983	44.158	0.686	-1.365	-5.743	–
Dias et al.	2021	300.983	44.16	0.686	-1.358	-5.733	13.519
Cantat-Gaudin et al.	2020	300.983	44.158	0.686	-1.365	-5.743	–
Sánchez et al.	2020	300.979	44.158	–	-1.397	-5.57	–
Donor et al.	2020	300.987	44.16	–	-1.18	-5.91	14.2
Cantat-Gaudin & Anders	2020	300.983	44.158	0.686	-1.365	-5.743	–
Liu & Pang	2019	301.0	44.188	0.683	-1.411	-5.748	–
Bossini et al.	2019	300.983	44.158	–	–	–	–
Soubiran et al.	2018	300.983	44.158	–	–	–	12.83
Cantat-Gaudin et al.	2018	300.983	44.158	0.686	-1.365	-5.743	–
Loktin & Popova	2017	300.975	44.158	–	-2.022	-3.143	13.7
Kharchenko et al.	2016	300.982	44.158	–	–	–	–
Dias et al.	2014	300.979	44.158	–	-1.39	-3.07	–
Kharchenko et al.	2013	300.987	44.16	–	-2.75	-4.8	13.7
Gozha et al.	2012	300.979	44.158	–	–	–	–
Piskunov et al.	2008	300.978	44.158	–	–	–	–
van den Bergh	2006	300.979	44.158	–	–	–	–
Kharchenko et al.	2005	300.97	44.16	–	-3.48	-5.8	–
Kharchenko et al.	2003	300.94	43.99	–	-4.06	-8.3	–
Dias et al.	2002	300.979	44.158	–	-1.39	-3.07	13.68

💡 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–	1.4	0.51	0.76	638	0.025	284	0.42	1.0
Li et al.	2025	1.36	0.39	–	848	0.039	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.120⁽⁵⁾	–	–	–
Almeida et al.	2025	1.35	0.50	–	726	–	284	–	–
Zhang et al.	2024	–	–	–	–	-0.037⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1125⁽¹⁾	–	–
Cavallo et al.	2024	1.49	0.54	–	724	0.340	–	–	–
Hunt & Reffert	2023	1.39	0.31	0.76	630	–	–	–	–
Almeida et al.	2023	1.38	0.51	–	780	0.063	449⁽¹⁾	0.42	–
Just et al.	2023	–	–	–	437	–	94	–	–
Tarricq et al.	2022	1.36	–	–	646	–	–	–	–
Jaehnig et al.	2021	1.40⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	1.40	0.22	–	813	–	–	–	1
Dias et al.	2021	1.35	0.50	–	726	0.047	–	–	–
Cantat-Gaudin et al.	2020	1.41	0.48	–	646	–	–	–	–
Donor et al.	2020	–	–	–	–	0.010	–	–	–
Cantat-Gaudin & Anders	2020	1.40	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	562	0.250	–	–	–
Bossini et al.	2019	1.34	0.40	–	776	-0.013	–	–	–
Soubiran et al.	2018	1.40	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.40	–	–	–	–	–	–	–
Loktin & Popova	2017	1.47	0.52	–	389	–	–	–	–
Kharchenko et al.	2016	1.33	0.84	–	437	–	–	–	–
Kharchenko et al.	2013	1.33	0.84	–	437	–	–	–	–
Gozha et al.	2012	1.45	–	–	377	–	59	–	–
Piskunov et al.	2008	1.45	0.53	–	479	–	–	–	–
van den Bergh	2006	1.45	0.53	–	380	–	–	–	–
Kharchenko et al.	2005	1.45	0.53	–	479	–	–	–	–
Kharchenko et al.	2003	1.45	0.53	–	–	–	–	–	–
Dias et al.	2002	1.19	0.23	–	813	-0.013	–	–	–

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

Visualization

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