Basel 1

(MWSC 2996; Apriamaswili 1; OCL 77)

0.82 UTI

0.71

C_N

0.87

C_dens

1.0

C_C3

0.77

C_lit

1.0

C_dup

N_m (P>50%) 92

Core radius and density 1.7 [pc], 4.3 [pc^-2]

C3 classification AA

C_N 0.71 Moderately populated
C_dens 0.87 Dense
C_C3 1.0 Very 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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Basel 1 is a moderately populated, dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is well-studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

Palma et al. (2025)
Classified as optical pair P268, along with HSC_269.

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 class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.133, e_all=0.1903.

Data

🔍 Search references for Basel 1 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–	282.03	-5.875	0.525	-0.074	-4.52	22.16
Li et al.	2025	282.036	-5.876	0.525	-0.079	-4.509	–
Almeida et al.	2025	282.04	-5.885	–	–	–	–
Hunt & Reffert	2024	282.027	-5.87	0.523	-0.045	-4.494	22.172
Cavallo et al.	2024	282.034	-5.883	0.524	–	–	–
Hunt & Reffert	2023	282.027	-5.87	0.523	-0.045	-4.494	22.172
Just et al.	2023	282.031	-5.866	–	–	–	–
Dias et al.	2021	282.04	-5.885	0.53	-0.082	-4.521	24.096
Cantat-Gaudin et al.	2020	282.036	-5.876	0.525	-0.079	-4.509	–
Cantat-Gaudin & Anders	2020	282.036	-5.876	0.525	-0.079	-4.509	–
Soubiran et al.	2018	282.036	-5.876	–	–	–	22.69
Bica et al.	2019	282.033	-5.847	–	–	–	–
Cantat-Gaudin et al.	2018	282.036	-5.876	0.525	-0.079	-4.509	–
Dias et al.	2018	–	–	–	-0.67	-2.32	–
Dib et al.	2018	282.037	-5.865	–	–	–	–
Loktin & Popova	2017	282.03	-5.865	–	0.959	-8.817	–
Sampedro et al.	2017	282.05	-5.85	–	-0.76	-2.63	–
Joshi et al.	2016	282.037	-5.865	–	–	–	–
Kharchenko et al.	2016	282.031	-5.866	–	–	–	–
Dias et al.	2014	282.05	-5.85	–	-1.07	-3.24	–
Kharchenko et al.	2013	282.037	-5.865	–	0.36	-5.53	–
Bukowiecki et al.	2011	282.038	-5.862	–	–	–	–
van den Bergh	2006	282.05	-5.85	–	–	–	–
Dias et al.	2002	282.05	-5.85	–	-1.07	-3.24	–
Lynga	1987	282.037	-5.838	–	–	–	–

💡 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–	1.75	1.59	1.155	136	0.102	404	–	–
Li et al.	2025	1.58	1.46	–	222	0.139	–	–	–
Almeida et al.	2025	1.52	1.59	–	178	–	261	–	–
Hunt & Reffert	2024	1.75	1.57	1.15	210	–	547⁽¹⁾	–	–
Cavallo et al.	2024	1.71	2.21	–	89	-0.090	–	–	–
Hunt & Reffert	2023	1.75	1.57	1.16	210	–	–	–	–
Just et al.	2023	–	–	–	136	–	144	–	–
Dias et al.	2021	1.52	1.59	–	178	0.102	–	–	–
Cantat-Gaudin et al.	2020	1.85	1.24	–	229	–	–	–	–
Kounkel et al.	2020	1.91	1.91	–	186	–	–	–	–
Cantat-Gaudin & Anders	2020	1.80	–	–	–	–	–	–	–
Soubiran et al.	2018	1.80	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.80	–	–	–	–	–	–	–
Dib et al.	2018	1.60	–	–	136	–	–	–	–
Loktin & Popova	2017	2.19	1.54	–	77	–	–	–	–
Joshi et al.	2016	1.60	1.71	–	136	–	–	–	–
Kharchenko et al.	2016	1.60	1.71	–	136	–	–	–	–
Kharchenko et al.	2013	1.60	1.71	–	136	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1587	–	–
Bukowiecki et al.	2011	2.12⁽¹⁾	1.70	–	141	–	–	–	–
van den Bergh	2006	2.18	1.51	–	78	–	–	–	–
Dias et al.	2002	2.18	1.52	–	78	–	–	–	–
Lynga	1987	1.46	2.18	–	58	–	–	–	–

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

Visualization

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