King 2

(MWSC 79; OCL 311)

0.92 UTI

0.89

C_N

1.0

C_dens

0.75

C_C3

0.97

C_lit

1.0

C_dup

N_m (P>50%) 476

Core radius and density 2.2 [pc], 8.3 [pc^-2]

C3 classification AB

C_N 0.89 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.97 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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King 2 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age 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.

Very distant Low extinction Massive Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.09 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.09 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2019, e_all=0.0876.

Rain et al. (2021)
The isochrone was move in 0.05 to the red and a distance modulus of m-M=13.8 was used to fit it.

Ahumada & Lapasset (2007)
Only candidates inside r/R=1 were considered. Adopted cluster centre: star 419 of (1990A&A...240..262A).

Data

🔍 Search references for King 2 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–	12.739	58.192	0.135	-1.399	-0.869	-137.646
Otto et al.	2026	12.739	58.187	–	-1.36	-0.82	-42.4
Li et al.	2025	12.741	58.188	0.166	-1.358	-0.824	–
Hunt & Reffert	2024	12.739	58.187	0.162	-1.419	-0.844	-101.762
Cavallo et al.	2024	12.743	58.192	0.154	–	–	–
Hunt & Reffert	2023	12.739	58.187	0.162	-1.419	-0.844	-101.762
Just et al.	2023	12.722	58.198	–	–	–	–
Jadhav & Subramaniam	2021	12.741	58.188	–	–	–	–
Jaehnig et al.	2021	12.736	58.194	0.156	-1.381	-0.816	–
Netopil et al.	2022	12.75	58.184	–	–	–	-145.06
Rain et al.	2021	12.741	58.188	0.166	-1.358	-0.824	–
Spina et al.	2021	12.741	58.188	0.15	-1.351	-0.828	–
Cantat-Gaudin et al.	2020	12.741	58.188	0.166	-1.358	-0.824	–
Donor et al.	2020	12.732	58.201	–	-1.49	-0.92	-135.5
Cantat-Gaudin & Anders	2020	12.741	58.188	0.166	-1.358	-0.824	–
Bica et al.	2019	12.723	58.202	–	–	–	–
Cantat-Gaudin et al.	2018	12.741	58.188	0.166	-1.358	-0.824	–
Loktin & Popova	2017	12.75	58.201	–	-0.223	-1.271	-144.2
Sampedro et al.	2017	12.75	58.183	–	–	–	–
Kharchenko et al.	2016	12.722	58.198	–	–	–	–
Netopil et al.	2016	12.75	58.183	–	–	–	–
Dias et al.	2014	12.75	58.183	–	-2.0	-2.6	–
Kharchenko et al.	2013	12.732	58.201	–	-1.71	-0.08	-144.2
Gozha et al.	2012	12.75	58.184	–	–	–	–
Kharchenko et al.	2012	12.732	58.201	–	-1.71	-0.08	-144.25
Bukowiecki et al.	2011	12.738	58.196	–	–	–	–
Ahumada & Lapasset	2007	12.75	58.183	–	–	–	–
van den Bergh	2006	12.75	58.183	–	–	–	–
Dias et al.	2002	12.75	58.183	–	-2.0	-2.6	-144.25
Lynga	1987	12.761	58.202	–	–	–	–

💡 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–	5.5	0.98	2.16	4376	-0.360	1949	–	26
Otto et al.	2026	–	–	–	4074	-0.180⁽¹⁵⁾	–	–	–
Li et al.	2025	5.15	1.69	–	1366	-0.360	–	–	–
Hunt & Reffert	2024	5.07	1.22	2.16	1096	–	1949⁽¹⁾	–	–
Cavallo et al.	2024	4.09	1.13	–	2291	-0.290	–	–	–
Hunt & Reffert	2023	5.07	1.22	2.16	1096	–	–	–	–
Just et al.	2023	–	–	–	4677	–	305	–	–
Spina et al.	2022	–	–	–	–	-0.360	–	–	–
Jadhav & Subramaniam	2021	6.76	0.97	–	4074	–	9995	–	14⁽¹⁾
Jaehnig et al.	2021	6.35⁽¹⁾	–	–	–	–	–	–	–
Netopil et al.	2022	6.61⁽¹⁾	–	–	5012	-0.360⁽¹⁾	–	–	–
Rain et al.	2021	5.14	0.98	–	6026	–	–	–	26
Spina et al.	2021	4.65	–	–	4074	-0.359⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	6.76	0.97	–	4074	–	–	–	–
Kounkel et al.	2020	4.36	1.14	–	1698	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.360	–	–	–
Cantat-Gaudin & Anders	2020	5.14	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.14	–	–	–	–	–	–	–
Loktin & Popova	2017	1.78	1.73	–	2818	–	–	–	–
Kharchenko et al.	2016	5.50	0.95	–	4677	–	–	–	–
Netopil et al.	2016	12.39	–	–	4920	–	–	–	–
Kharchenko et al.	2013	5.50	0.95	–	4677	-0.420	–	–	–
Gozha et al.	2012	5.75	–	–	6026	-0.420	–	–	–
Kharchenko et al.	2012	5.50	0.95	–	4677	-0.420	–	–	–
Bukowiecki et al.	2011	7.01⁽¹⁾	1.17	–	1778	–	–	–	–
Paunzen et al.	2010	–	–	–	–	-0.320	–	–	–
Ahumada & Lapasset	2007	–	0.98	–	6026	–	–	–	30
van den Bergh	2006	5.75	0.98	–	6026	–	–	–	–
Dias et al.	2002	5.75	0.98	–	6026	-0.420	–	–	–

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

Visualization

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