Berkeley 23

(FSR 0917; MWSC 902; OCL 478)

0.95 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 117

Stellar density (N₅₀/rad) 20.0 [N/pc²]

C3 classification AA

C_N 0.76 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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Berkeley 23 is a rich, very dense object of very high C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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 Massive Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Berkeley 23 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–	98.317	20.532	0.18	-0.098	-1.306	39.86
Li et al.	2025	98.318	20.535	0.151	-0.055	-1.339	–
Hu & Soubiran	2025	98.31	20.532	–	–	–	–
Almeida et al.	2025	98.316	20.538	–	–	–	–
Hunt & Reffert	2024	98.315	20.535	0.185	-0.088	-1.322	40.658
Cavallo et al.	2024	98.31	20.532	0.184	–	–	–
Hunt & Reffert	2023	98.315	20.535	0.185	-0.088	-1.322	40.658
Just et al.	2023	98.316	20.526	–	–	–	–
Jaehnig et al.	2021	98.318	20.535	0.157	-0.055	-1.313	–
Rain et al.	2021	98.318	20.535	0.151	-0.055	-1.339	–
Dias et al.	2021	98.316	20.538	0.153	-0.069	-1.338	–
Cantat-Gaudin et al.	2020	98.318	20.535	0.151	-0.055	-1.339	–
Cantat-Gaudin & Anders	2020	98.318	20.535	0.151	-0.055	-1.339	–
Soubiran et al.	2018	98.318	20.535	–	–	–	51.85
Bica et al.	2019	98.305	20.534	–	–	–	–
Cantat-Gaudin et al.	2018	98.318	20.535	0.151	-0.055	-1.339	–
Loktin & Popova	2017	98.325	20.525	–	0.07	-1.058	48.6
Kharchenko et al.	2016	98.316	20.526	–	–	–	–
Dias et al.	2014	98.375	20.55	–	2.65	-7.32	–
Kharchenko et al.	2013	98.325	20.525	–	-1.36	-2.34	–
Gozha et al.	2012	98.375	20.55	–	–	–	–
Froebrich et al.	2007	98.321	20.519	–	–	–	–
van den Bergh	2006	98.369	20.546	–	–	–	–
Chen et al.	2003	98.367	20.553	–	–	–	–
Dias et al.	2002	98.375	20.55	–	2.65	-7.32	48.6

💡 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–	5.57	1.24	0.98	933	-0.062	1349	–	8.0
Li et al.	2025	5.40	1.26	–	1532	-0.360	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.180⁽⁵⁾	–	–	–
Almeida et al.	2025	4.84	0.86	–	1754	–	742	–	–
Hunt & Reffert	2024	–	–	–	–	–	1618⁽¹⁾	–	–
Cavallo et al.	2024	3.84	1.26	–	2239	-0.490	–	–	–
Hunt & Reffert	2023	5.74	1.05	0.98	1094	–	–	–	–
Just et al.	2023	–	–	–	933	–	1349	–	–
Jaehnig et al.	2021	6.50⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	5.57	1.24	–	794	–	–	–	8
Dias et al.	2021	4.84	0.86	–	1754	0.055	–	–	–
Cantat-Gaudin et al.	2020	5.42	0.83	–	1047	–	–	–	–
Cantat-Gaudin & Anders	2020	5.57	–	–	–	–	–	–	–
Soubiran et al.	2018	5.57	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.57	–	–	–	–	–	–	–
Loktin & Popova	2017	11.12	1.22	–	813	–	–	–	–
Kharchenko et al.	2016	4.72	1.24	–	933	–	–	–	–
Kharchenko et al.	2013	4.72	1.24	–	933	0.070	–	–	–
Gozha et al.	2012	6.92	–	–	794	0.070	–	–	–
van den Bergh	2006	6.92	1.24	–	794	–	–	–	–
Chen et al.	2003	6.92	1.24	–	790	0.070⁽¹⁾	–	–	–
Dias et al.	2002	6.92	1.24	–	794	-0.420	–	–	–

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

Visualization

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