Berkeley 66

(MWSC 255; OCL 373; FSR 0624)

0.75 UTI

0.76

C_N

0.5

C_dens

0.62

C_C3

0.93

C_lit

1.0

C_dup

N_m (P>50%) 123

Core radius and density 1.7 [pc], 2.5 [pc^-2]

C3 classification AC

C_N 0.76 Rich
C_dens 0.5 Moderately dense
C_C3 0.62 Intermediate quality
C_lit 0.93 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 66 is a rich, moderately dense object of intermediate C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by high 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 High extinction Massive Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.37 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.37 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0539, e_all=0.1411.

Ahumada & Lapasset (2007)
The blue straggler area is heavily contaminated by field stars. Only straggler candidates inside a radius of 2' around the centre of coordinates have been considered.

Data

🔍 Search references for Berkeley 66 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–	46.016	58.732	0.183	-0.138	0.051	-49.255
Otto et al.	2026	46.019	58.742	–	-0.12	-0.19	-49.9
Guerco et al.	2025	46.1	58.8	0.18	-0.17	0.07	-50.0
Hunt & Reffert	2024	46.019	58.742	0.196	-0.198	0.038	-41.845
Cavallo et al.	2024	46.039	58.706	0.194	–	–	–
Hunt & Reffert	2023	46.019	58.742	0.196	-0.198	0.038	-41.845
Just et al.	2023	46.003	58.738	–	–	–	–
Jadhav & Subramaniam	2021	46.03	58.731	–	–	–	–
Jaehnig et al.	2021	46.017	58.729	0.19	-0.306	0.034	–
Netopil et al.	2022	46.03	58.73	–	–	–	-50.15
Spina et al.	2021	46.015	58.734	0.147	-0.095	0.02	–
Cantat-Gaudin et al.	2020	46.03	58.731	0.158	-0.12	-0.191	–
Donor et al.	2020	46.016	58.74	–	0.01	-0.1	-50.0
Cantat-Gaudin & Anders	2020	46.03	58.731	0.158	-0.12	-0.191	–
Soubiran et al.	2018	46.03	58.731	–	–	–	-76.19
Bica et al.	2019	46.016	58.74	–	–	–	–
Cantat-Gaudin et al.	2018	46.03	58.731	0.158	-0.12	-0.191	–
Loktin & Popova	2017	46.02	58.768	–	3.582	-1.289	-50.6
Sampedro et al.	2017	46.075	58.767	–	-0.75	1.45	–
Kharchenko et al.	2016	46.003	58.738	–	–	–	–
Kharchenko et al.	2013	46.015	58.74	–	2.81	0.03	-50.6
Gozha et al.	2012	46.075	58.767	–	–	–	–
Kharchenko et al.	2012	46.015	58.74	–	2.81	0.03	-50.65
Bukowiecki et al.	2011	46.008	58.747	–	–	–	–
Kharchenko et al.	2007	46.08	58.77	–	0.03	–	–
Ahumada & Lapasset	2007	46.075	58.767	–	–	–	–
van den Bergh	2006	46.075	58.767	–	–	–	–
Dias et al.	2002	46.075	58.767	–	-0.63	2.6	-50.6
Lynga	1987	46.063	58.783	–	–	–	–

💡 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–	5.155	3.62	2.855	2954	-0.210	1894	–	36
Otto et al.	2026	–	–	–	3090	-0.210⁽¹⁵⁾	–	–	–
Guerco et al.	2025	–	–	–	3090	-0.200	–	–	–
Hunt & Reffert	2024	4.21	3.89	2.86	304	–	1894⁽¹⁾	–	–
Cavallo et al.	2024	5.86	3.60	–	479	-0.110	–	–	–
Hunt & Reffert	2023	4.21	3.89	2.85	303	–	–	–	–
Just et al.	2023	–	–	–	1413	–	1807	–	–
Spina et al.	2022	–	–	–	–	-0.190	–	–	–
Jadhav & Subramaniam	2021	4.76	3.60	–	3090	–	7429	–	3⁽¹⁾
Jaehnig et al.	2021	5.74⁽¹⁾	–	–	–	–	–	–	–
Netopil et al.	2022	4.57⁽¹⁾	–	–	3802	-0.190⁽¹⁾	–	–	–
Spina et al.	2021	5.04	–	–	3090	-0.216⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	4.76	3.60	–	3090	–	–	–	–
Kounkel et al.	2020	5.85	3.22	–	1072	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.190	–	–	–
Cantat-Gaudin & Anders	2020	5.35	–	–	–	–	–	–	–
Soubiran et al.	2018	5.35	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	5.35	–	–	–	–	–	–	–
Loktin & Popova	2017	1.91	3.93	–	1122	–	–	–	–
Kharchenko et al.	2016	7.00	3.62	–	1413	–	–	–	–
Kharchenko et al.	2013	7.00	3.62	–	1413	-0.480	–	–	–
Gozha et al.	2012	5.00	–	–	3981	-0.480	–	–	–
Kharchenko et al.	2012	7.00	3.62	–	1413	-0.480	–	–	–
Bukowiecki et al.	2011	5.11⁽¹⁾	3.12	–	2818	–	–	–	–
Ahumada & Lapasset	2007	–	3.94	–	5012	–	–	–	70
van den Bergh	2006	5.20	3.94	–	5012	–	–	–	–
Dias et al.	2002	5.00	4.04	–	3981	-0.480	–	–	–

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

Visualization

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