King 4

(MWSC 216)

0.84 UTI

0.78

C_N

1.0

C_dens

0.75

C_C3

0.84

C_lit

1.0

C_dup

N_m (P>50%) 177

Core radius and density 1.8 [pc], 6.4 [pc^-2]

C3 classification AB

C_N 0.78 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.84 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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King 4 is a rich, very dense object of 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, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is well-studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1001, e_all=0.016.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.646, Av=2.411, [Fe/H]=0.000 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108).

Data

🔍 Search references for King 4 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–	39.028	59.027	0.392	-0.597	-0.163	-46.098
Li et al.	2025	39.028	59.024	0.378	-0.575	-0.084	–
Almeida et al.	2025	39.018	59.024	–	–	–	–
Hunt & Reffert	2024	39.026	59.021	0.393	-0.602	-0.183	-45.23
Cavallo et al.	2024	39.024	59.037	0.395	–	–	–
Hunt & Reffert	2023	39.026	59.021	0.393	-0.602	-0.183	-45.23
Almeida et al.	2023	39.024	59.026	–	–	–	–
Just et al.	2023	39.011	59.023	–	–	–	–
Jaehnig et al.	2021	39.028	59.024	0.416	-0.554	-0.114	–
Rain et al.	2021	39.028	59.024	0.378	-0.575	-0.084	–
Dias et al.	2021	39.018	59.024	0.38	-0.588	-0.041	–
Cantat-Gaudin et al.	2020	39.028	59.024	0.378	-0.575	-0.084	–
Cantat-Gaudin & Anders	2020	39.028	59.024	0.378	-0.575	-0.084	–
Bossini et al.	2019	39.028	59.024	–	–	–	–
Soubiran et al.	2018	39.028	59.024	–	–	–	-44.33
Cantat-Gaudin et al.	2018	39.028	59.024	0.378	-0.575	-0.084	–
Loktin & Popova	2017	39.015	59.025	–	-1.055	-0.122	-58.3
Sampedro et al.	2017	38.925	59.0	–	0.25	3.31	–
Kharchenko et al.	2016	39.011	59.023	–	–	–	–
Dias et al.	2014	38.925	59.0	–	0.52	2.44	–
Kharchenko et al.	2013	39.022	59.025	–	-1.74	-0.09	-58.3
Kharchenko et al.	2012	39.022	59.025	–	-1.8	-0.06	–
Bukowiecki et al.	2011	39.013	59.022	–	–	–	–
Ahumada & Lapasset	2007	38.925	59.0	–	–	–	–
van den Bergh	2006	38.925	59.0	–	–	–	–
Dias et al.	2002	38.925	59.0	–	0.52	2.44	–
Lynga	1987	38.933	58.996	–	–	–	–

💡 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–	2.59	2.55	1.25	126	-0.042	772	0.57	0
Li et al.	2025	2.89	2.66	–	181	-0.063	–	–	–
Almeida et al.	2025	2.13	2.42	–	215	–	504	–	–
Hunt & Reffert	2024	2.35	2.42	1.25	146	–	1256⁽¹⁾	–	–
Cavallo et al.	2024	2.59	2.56	–	126	0.430	–	–	–
Hunt & Reffert	2023	2.35	2.42	1.25	146	–	–	–	–
Almeida et al.	2023	2.20	2.54	–	84	-0.112	888⁽¹⁾	0.57	–
Just et al.	2023	–	–	–	160	–	444	–	–
Jaehnig et al.	2021	2.40⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.46	2.43	–	44	–	–	–	0
Dias et al.	2021	2.13	2.42	–	215	-0.042	–	–	–
Cantat-Gaudin et al.	2020	2.70	2.20	–	100	–	–	–	–
Kounkel et al.	2020	2.69	2.42	–	145	–	–	–	–
Cantat-Gaudin & Anders	2020	2.46	–	–	–	–	–	–	–
Bossini et al.	2019	3.08	2.41	–	44	0.000	–	–	–
Soubiran et al.	2018	2.46	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.46	–	–	–	–	–	–	–
Loktin & Popova	2017	3.13	2.70	–	44	–	–	–	–
Kharchenko et al.	2016	2.80	2.82	–	160	–	–	–	–
Kharchenko et al.	2013	2.80	2.82	–	160	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	772	–	–
Kharchenko et al.	2012	2.80	2.82	–	162	–	–	–	–
Bukowiecki et al.	2011	2.86⁽¹⁾	2.52	–	50	–	–	–	–
Ahumada & Lapasset	2007	–	2.71	–	41	–	–	–	0
van den Bergh	2006	3.17	2.71	–	40	–	–	–	–
Dias et al.	2002	3.17	2.72	–	40	–	–	–	–
Lynga	1987	2.20	2.62	–	32	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FSR 0600	8.5	39.2	59.1	0.38	-0.63	-0.2	–	0.04

💡 Note: The % column shows the percentage of members that King 4 shares with each listed object.

Visualization

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