Berkeley 101

(FSR 0444; MWSC 3737; OCL 267)

0.82 UTI

0.79

C_N

1.0

C_dens

0.75

C_C3

0.77

C_lit

1.0

C_dup

N_m (P>50%) 206

Core radius and density 1.2 [pc], 7.4 [pc^-2]

C3 classification AB

C_N 0.79 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.77 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 101 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above 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 metallicity parameters (see Parameters). It is well-studied in the literature.

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

Distant High extinction Massive Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.162, e_all=0.0335.

Data

🔍 Search references for Berkeley 101 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–	353.203	64.205	0.202	-1.86	-1.093	-70.417
Li et al.	2025	353.213	64.209	0.177	-1.899	-1.089	–
Hu & Soubiran	2025	353.21	64.203	–	–	–	–
Almeida et al.	2025	353.215	64.21	–	–	–	–
Hunt & Reffert	2024	353.207	64.206	0.199	-1.86	-1.09	-66.733
Cavallo et al.	2024	353.21	64.203	0.196	–	–	–
Hunt & Reffert	2023	353.207	64.206	0.199	-1.86	-1.09	-66.733
Just et al.	2023	353.181	64.202	–	–	–	–
Jadhav & Subramaniam	2021	353.213	64.209	–	–	–	–
Dias et al.	2021	353.215	64.21	0.165	-1.869	-1.075	–
Cantat-Gaudin et al.	2020	353.213	64.209	0.177	-1.899	-1.089	–
Cantat-Gaudin & Anders	2020	353.213	64.209	0.177	-1.899	-1.089	–
Bica et al.	2019	353.195	64.196	–	–	–	–
Cantat-Gaudin et al.	2018	353.213	64.209	0.177	-1.899	-1.089	–
Loktin & Popova	2017	353.19	64.208	–	-2.05	-0.11	–
Sampedro et al.	2017	353.196	64.208	–	-2.33	3.66	–
Kharchenko et al.	2016	353.181	64.202	–	–	–	–
Tadross	2014	353.196	64.208	–	–	–	–
Dias et al.	2014	353.196	64.208	–	-0.8	5.35	–
Kharchenko et al.	2013	353.188	64.205	–	-2.33	-0.44	–
Kharchenko et al.	2012	353.188	64.205	–	-2.05	-0.11	–
Bukowiecki et al.	2011	353.192	64.205	–	–	–	–
Froebrich et al.	2007	353.208	64.213	–	–	–	–
Dias et al.	2002	353.196	64.208	–	-2.05	-0.11	–
Lynga	1987	353.377	64.211	–	–	–	–

💡 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–	4.27	3.005	1.42	562	0.053	1393	–	1
Li et al.	2025	4.76	2.96	–	579	0.449	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.410⁽⁵⁾	–	–	–
Almeida et al.	2025	4.46	3.01	–	439	–	729	–	–
Hunt & Reffert	2024	4.48	3.33	1.42	217	–	1893⁽¹⁾	–	–
Cavallo et al.	2024	3.48	3.06	–	724	0.120	–	–	–
Hunt & Reffert	2023	4.48	3.33	1.42	217	–	–	–	–
Just et al.	2023	–	–	–	724	–	1393	–	–
Jadhav & Subramaniam	2021	4.27	2.84	–	380	–	766	–	1⁽¹⁾
Dias et al.	2021	4.46	3.01	–	439	-0.013	–	–	–
Cantat-Gaudin et al.	2020	4.27	2.84	–	380	–	–	–	–
Kounkel et al.	2020	4.55	3.18	–	427	–	–	–	–
Cantat-Gaudin & Anders	2020	4.85	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.85	–	–	–	–	–	–	–
Loktin & Popova	2017	2.84	2.68	–	575	–	–	–	–
Kharchenko et al.	2016	3.00	2.99	–	724	–	–	–	–
Tadross	2014	2.50	3.50	–	700	–	–	–	–
Kharchenko et al.	2013	3.00	2.99	–	724	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	2315	–	–
Kharchenko et al.	2012	3.00	2.99	–	724	–	–	–	–
Bukowiecki et al.	2011	2.72⁽¹⁾	3.00	–	562	–	–	–	–
Dias et al.	2002	2.69	3.09	–	562	–	–	–	–

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

Visualization

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