Berkeley 98

(FSR 0361; MWSC 3655; OCL 234; FoF 48)

0.93 UTI

0.81

C_N

0.85

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N_m (P>50%) 251

Core radius and density 2.4 [pc], 4.2 [pc^-2]

C3 classification AA

C_N 0.81 Rich
C_dens 0.85 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 98 is a rich, dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity 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.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Distant Low extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.96 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.96 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1567, e_all=0.2384.

Data

🔍 Search references for Berkeley 98 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–	340.665	52.408	0.25	-1.352	-3.255	-69.802
Otto et al.	2026	340.67	52.405	–	-1.35	-3.19	-64.9
Li et al.	2025	340.665	52.407	0.253	-1.353	-3.186	–
Guerco et al.	2025	341.0	52.6	0.25	-1.32	-3.23	-69.1
Hu & Soubiran	2025	340.661	52.408	–	–	–	–
Almeida et al.	2025	340.644	52.415	–	–	–	–
Hunt & Reffert	2024	340.67	52.405	0.251	-1.348	-3.258	-69.962
Cavallo et al.	2024	340.661	52.408	0.253	–	–	–
Hunt & Reffert	2023	340.67	52.405	0.251	-1.348	-3.258	-69.962
Just et al.	2023	340.647	52.364	–	–	–	–
Jadhav & Subramaniam	2021	340.665	52.407	–	–	–	–
Netopil et al.	2022	340.665	52.407	–	–	–	-69.2
Dias et al.	2021	340.644	52.415	0.255	-1.334	-3.214	-64.464
Spina et al.	2021	340.663	52.405	0.255	-1.347	-3.202	–
Cantat-Gaudin et al.	2020	340.665	52.407	0.253	-1.353	-3.186	–
Sánchez et al.	2020	340.658	52.388	–	-1.33	-3.176	–
Donor et al.	2020	340.654	52.368	–	-1.41	-3.23	-64.9
Cantat-Gaudin & Anders	2020	340.665	52.407	0.253	-1.353	-3.186	–
Liu & Pang	2019	340.67	52.407	0.278	-1.366	-3.142	–
Bica et al.	2019	340.664	52.41	–	–	–	–
Cantat-Gaudin et al.	2018	340.665	52.407	0.253	-1.353	-3.186	–
Dias et al.	2018	–	–	–	-2.99	-3.93	–
Loktin & Popova	2017	340.665	52.388	–	-5.278	0.432	–
Sampedro et al.	2017	340.658	52.388	–	-0.66	-1.49	–
Kharchenko et al.	2016	340.647	52.364	–	–	–	–
Dias et al.	2014	340.658	52.388	–	-0.47	-1.52	–
Kharchenko et al.	2013	340.654	52.368	–	-5.83	-0.37	–
Kharchenko et al.	2012	340.654	52.368	–	-5.83	-0.37	–
Bukowiecki et al.	2011	340.671	52.422	–	–	–	–
Froebrich et al.	2007	340.679	52.411	–	–	–	–
Dias et al.	2002	340.658	52.388	–	-0.47	-1.52	–
Lynga	1987	340.796	52.408	–	–	–	–

💡 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–	3.54	0.7	0.65	2455	-0.014	1560	–	5
Otto et al.	2026	–	–	–	2455	-0.030⁽¹⁵⁾	–	–	–
Li et al.	2025	3.49	0.70	–	2925	0.010	–	–	–
Guerco et al.	2025	–	–	–	2450	-0.030	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Almeida et al.	2025	3.45	0.74	–	3342	–	749	–	–
Hunt & Reffert	2024	3.76	0.78	0.65	1220	–	1084⁽¹⁾	–	–
Cavallo et al.	2024	2.59	1.47	–	2692	-0.910	–	–	–
Hunt & Reffert	2023	3.76	0.78	0.65	1219	–	–	–	–
Just et al.	2023	–	–	–	2089	–	3119	–	–
Spina et al.	2022	–	–	–	–	0.000	–	–	–
Jadhav & Subramaniam	2021	3.52	0.61	–	2455	–	2037	–	5⁽¹⁾
Netopil et al.	2022	3.52⁽¹⁾	–	–	2455	0.000⁽¹⁾	–	–	–
Dias et al.	2021	3.45	0.74	–	3342	-0.059	–	–	–
Spina et al.	2021	3.78	–	–	2455	-0.014⁽²⁰⁾	–	–	–
Cantat-Gaudin et al.	2020	3.52	0.61	–	2455	–	–	–	–
Kounkel et al.	2020	3.35	0.83	–	1905	–	–	–	–
Donor et al.	2020	–	–	–	–	0.000	–	–	–
Cantat-Gaudin & Anders	2020	3.54	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	2950	0.000	–	–	–
Cantat-Gaudin et al.	2018	3.54	–	–	–	–	–	–	–
Loktin & Popova	2017	3.71	0.89	–	1122	–	–	–	–
Kharchenko et al.	2016	4.20	0.63	–	2089	–	–	–	–
Kharchenko et al.	2013	4.20	0.63	–	2089	–	–	–	–
Kharchenko et al.	2012	4.20	0.63	–	2089	–	–	–	–
Bukowiecki et al.	2011	3.65⁽¹⁾	0.35	–	2239	–	–	–	–
Dias et al.	2002	3.74	0.41	–	2512	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0176	10.0	340.67	52.4	0.27	-1.34	-3.21	-69.97	0.0

💡 Note: The % column shows the percentage of members that Berkeley 98 shares with each listed object.

Visualization

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