King 25

(MWSC 3113; OCL 106; FSR 0127)

0.84 UTI

0.83

C_N

1.0

C_dens

1.0

C_C3

0.68

C_lit

1.0

C_dup

N_m (P>50%) 311

Core radius and density 2.6 [pc], 5.7 [pc^-2]

C3 classification AA

C_N 0.83 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.68 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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King 25 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

Relatively close High extinction Massive Near-solar metallicity Intermediate age

Li et al. (2026)
Tidal & Core radii: r_t=24+/-26.4 [pc], r_c=0.51+/-0.02 [pc]; stars within r_t: N~172

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P51, along with HSC_406.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst 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=0.0588, e_all=0.0665.

Dias et al. (2016)
No cluster (Carraro, G.; Janes, K. A.; Eastman, J. D. 2005, MNRAS 364, 179); cat V3.5 (Jan 2016)

Data

🔍 Search references for King 25 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–	291.127	13.698	0.315	-1.381	-3.962	21.385
Li et al.	2026	291.13	13.7	–	–	–	–
Almeida et al.	2025	291.116	13.694	–	–	–	–
Hunt & Reffert	2024	291.134	13.697	0.313	-1.387	-3.95	37.877
Cavallo et al.	2024	291.13	13.691	0.314	–	–	–
Hunt & Reffert	2023	291.134	13.697	0.313	-1.387	-3.95	37.877
Just et al.	2023	291.119	13.698	–	–	–	–
Dias et al.	2021	291.116	13.694	0.313	-1.373	-3.961	13.25
Cantat-Gaudin et al.	2020	291.122	13.696	0.31	-1.367	-3.958	–
Cantat-Gaudin & Anders	2020	291.122	13.696	0.31	-1.367	-3.958	–
Soubiran et al.	2018	291.122	13.696	–	–	–	14.25
Bica et al.	2019	291.142	13.697	–	–	–	–
Cantat-Gaudin et al.	2018	291.122	13.696	0.31	-1.367	-3.958	–
Dib et al.	2018	291.124	13.7	–	–	–	–
Joshi et al.	2016	291.124	13.7	–	–	–	–
Kharchenko et al.	2016	291.119	13.698	–	–	–	–
Kharchenko et al.	2013	291.124	13.7	–	0.18	-3.08	–
Dias et al.	2002	291.125	13.7	–	–	–	–
Lynga	1987	291.128	13.693	–	–	–	–
Alter et al.	1970	291.133	13.702	–	–	–	–

💡 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–	2.83	4.2	1.89	239	0.420	1172	–	–
Almeida et al.	2025	2.36	3.77	–	196	–	1172	–	–
Hunt & Reffert	2024	2.83	5.02	1.89	83	–	5054⁽¹⁾	–	–
Cavallo et al.	2024	3.37	4.85	–	37	0.410	–	–	–
Hunt & Reffert	2023	2.83	5.02	1.89	83	–	–	–	–
Just et al.	2023	–	–	–	282	–	259	–	–
Dias et al.	2021	2.36	3.77	–	196	0.430	–	–	–
Cantat-Gaudin et al.	2020	3.09	4.17	–	45	–	–	–	–
Kounkel et al.	2020	2.92	4.01	–	355	–	–	–	–
Cantat-Gaudin & Anders	2020	2.95	–	–	–	–	–	–	–
Soubiran et al.	2018	2.95	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.95	–	–	–	–	–	–	–
Dib et al.	2018	1.80	–	–	282	–	–	–	–
Joshi et al.	2016	1.80	4.20	–	282	–	–	–	–
Kharchenko et al.	2016	1.80	4.20	–	282	–	–	–	–
Kharchenko et al.	2013	1.80	4.20	–	282	–	–	–	–

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

Visualization

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