Berkeley 18

(MWSC 512; King 22; OCL 420; OCL 419; FSR 0731)

0.95 UTI

1.0

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 1766

Stellar density (N₅₀/rad) 15.6 [N/pc²]

C3 classification AB

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 0.75 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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Berkeley 18 is a very rich, very dense object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a very massive, near-solar metallicity, old cluster (see Parameters). It is very well-studied in the literature.

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

Very distant Moderate extinction Very massive Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Berkeley 18 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–	80.54	45.44	0.17	0.776	-0.079	-2.731
Hu & Soubiran	2025	80.54	45.441	–	–	–	–
Zhang et al.	2024	80.554	45.468	–	–	–	–
Hunt & Reffert	2024	80.554	45.468	0.162	0.782	-0.059	-5.494
Cavallo et al.	2024	80.54	45.441	0.165	–	–	–
Hunt & Reffert	2023	80.554	45.468	0.162	0.782	-0.059	-5.494
Just et al.	2023	80.592	45.405	–	–	–	–
Jaehnig et al.	2021	80.525	45.439	0.166	0.824	-0.045	–
Rain et al.	2021	80.531	45.442	0.152	0.849	-0.057	–
Cantat-Gaudin et al.	2020	80.531	45.442	0.152	0.849	-0.057	–
Cantat-Gaudin & Anders	2020	80.531	45.442	0.152	0.849	-0.057	–
Soubiran et al.	2018	80.531	45.442	–	–	–	-2.0
Bica et al.	2019	80.54	45.469	–	–	–	–
Cantat-Gaudin et al.	2018	80.531	45.442	0.152	0.849	-0.057	–
Loktin & Popova	2017	80.55	45.4	–	0.22	-1.212	-5.5
Kharchenko et al.	2016	80.592	45.405	–	–	–	–
Dias et al.	2014	80.55	45.4	–	0.33	-4.52	–
Kharchenko et al.	2013	80.602	45.405	–	-0.37	-3.58	-5.5
Gozha et al.	2012	80.55	45.4	–	–	–	–
Kharchenko et al.	2012	80.602	45.405	–	-0.37	-3.58	–
van den Bergh	2006	80.55	45.4	–	–	–	–
Chen et al.	2003	80.541	45.397	–	–	–	–
Dias et al.	2002	80.55	45.4	–	0.33	-4.52	-5.5

💡 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–	5.71	1.43	1.84	4266	-0.025	9422	–	32.0
Hu & Soubiran	2025	–	–	–	–	-0.260⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.366⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	6570⁽¹⁾	–	–
Cavallo et al.	2024	5.22	1.57	–	3090	-0.070	–	–	–
Hunt & Reffert	2023	5.02	1.85	1.84	1462	–	–	–	–
Just et al.	2023	–	–	–	4266	–	12274	–	–
Jaehnig et al.	2021	5.83⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	5.52	1.43	–	4266	–	–	–	32
Cantat-Gaudin et al.	2020	5.62	1.53	–	4365	–	–	–	–
Cantat-Gaudin & Anders	2020	5.52	–	–	–	–	–	–	–
Soubiran et al.	2018	5.52	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.52	–	–	–	–	–	–	–
Loktin & Popova	2017	4.41	1.70	–	1445	–	–	–	–
Kharchenko et al.	2016	5.80	1.40	–	4266	–	–	–	–
Kharchenko et al.	2013	5.80	1.40	–	4266	0.020	–	–	–
Gozha et al.	2012	5.80	–	–	4266	0.020	–	–	–
Kharchenko et al.	2012	5.80	1.40	–	4266	0.020	–	–	–
van den Bergh	2006	5.80	1.43	–	4266	–	–	–	–
Chen et al.	2003	5.80	1.43	–	4260	0.020⁽¹⁾	–	–	–
Dias et al.	2002	5.80	1.43	–	4266	-0.400	–	–	–

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

Visualization

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