Berkeley 33

(MWSC 1033)

0.91 UTI

0.82

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 294

Stellar density (N₅₀/rad) 17.4 [N/pc²]

C3 classification AB

C_N 0.82 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 33 is a rich, very dense object of high C3 quality. Its parallax locates it at a large distance, below 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 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 Moderate extinction Massive Near-solar metallicity Intermediate age Contains BSS

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for Berkeley 33 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–	104.459	-13.227	0.17	-0.703	1.602	78.57
Li et al.	2025	104.456	-13.227	0.144	-0.73	1.551	–
Almeida et al.	2025	104.454	-13.226	–	–	–	–
Hunt & Reffert	2024	104.462	-13.226	0.176	-0.688	1.594	84.489
Cavallo et al.	2024	104.461	-13.231	0.176	–	–	–
Hunt & Reffert	2023	104.462	-13.226	0.176	-0.688	1.594	84.489
Just et al.	2023	104.454	-13.219	–	–	–	–
Jaehnig et al.	2021	104.459	-13.226	0.165	-0.731	1.577	–
Rain et al.	2021	104.456	-13.227	0.144	-0.73	1.551	–
Dias et al.	2021	104.454	-13.226	0.147	-0.741	1.575	78.836
Spina et al.	2021	104.457	-13.228	0.136	-0.73	1.582	–
Cantat-Gaudin et al.	2020	104.456	-13.227	0.144	-0.73	1.551	–
Donor et al.	2020	104.46	-13.22	–	-0.69	1.56	77.5
Cantat-Gaudin & Anders	2020	104.456	-13.227	0.144	-0.73	1.551	–
Soubiran et al.	2018	104.456	-13.227	–	–	–	78.82
Cantat-Gaudin et al.	2018	104.456	-13.227	0.144	-0.73	1.551	–
Loktin & Popova	2017	104.46	-13.216	–	-0.392	0.271	76.6
Kharchenko et al.	2016	104.454	-13.219	–	–	–	–
Dias et al.	2014	104.425	-13.217	–	-1.35	4.29	–
Kharchenko et al.	2013	104.46	-13.22	–	0.23	1.82	76.6
Gozha et al.	2012	104.425	-13.217	–	–	–	–
Bukowiecki et al.	2011	104.467	-13.228	–	–	–	–
van den Bergh	2006	104.425	-13.217	–	–	–	–
Dias et al.	2002	104.425	-13.217	–	-1.36	4.36	76.6

💡 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–	5.17	1.75	1.4	726	-0.260	1592	–	1.0
Li et al.	2025	4.82	1.81	–	745	-0.327	–	–	–
Almeida et al.	2025	4.38	2.06	–	305	–	1156	–	–
Hunt & Reffert	2024	–	–	–	–	–	2028⁽¹⁾	–	–
Cavallo et al.	2024	4.23	2.03	–	295	-0.160	–	–	–
Hunt & Reffert	2023	4.93	1.49	1.40	481	–	–	–	–
Just et al.	2023	–	–	–	1096	–	497	–	–
Jaehnig et al.	2021	5.81⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	5.79	1.12	–	794	–	–	–	1
Dias et al.	2021	4.38	2.06	–	305	-0.195	–	–	–
Spina et al.	2021	5.17	–	–	234	-0.227⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	5.86	1.75	–	234	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.300	–	–	–
Cantat-Gaudin & Anders	2020	5.79	–	–	–	–	–	–	–
Soubiran et al.	2018	5.79	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.79	–	–	–	–	–	–	–
Loktin & Popova	2017	10.96	1.92	–	195	–	–	–	–
Kharchenko et al.	2016	4.79	0.97	–	1096	–	–	–	–
Kharchenko et al.	2013	4.79	0.97	–	1096	-0.260	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	7140	–	–
Gozha et al.	2012	6.00	–	–	794	-0.260	–	–	–
Bukowiecki et al.	2011	4.00⁽¹⁾	1.21	–	794	–	–	–	–
van den Bergh	2006	4.63	2.17	–	708	–	–	–	–
Dias et al.	2002	6.00	1.12	–	794	-0.260	–	–	–

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

Visualization

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