Basel 11a

(MWSC 1162; OCL 584.1; FoF 2084)

0.90 UTI

0.76

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 133

Stellar density (N₅₀/rad) 40.0 [N/pc²]

C3 classification AB

C_N 0.76 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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Basel 11a is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is very well-studied in the literature.

Relatively close Low extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P82, along with HSC_1797.

Cavallo et al. (2024)
Gold sample.

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

Data

🔍 Search references for Basel 11a 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–	109.301	-13.99	0.718	-1.596	0.964	25.779
Li et al.	2025	109.296	-13.988	0.709	-1.581	0.929	–
Almeida et al.	2025	109.303	-13.981	–	–	–	–
Hunt & Reffert	2024	109.293	-13.983	0.715	-1.605	0.976	31.379
Cavallo et al.	2024	109.314	-13.987	0.716	–	–	–
Hunt & Reffert	2023	109.293	-13.983	0.715	-1.605	0.976	31.379
Almeida et al.	2023	109.315	-13.986	–	–	–	–
Just et al.	2023	109.272	-13.98	–	–	–	–
Dias et al.	2021	109.303	-13.981	0.71	-1.584	0.935	–
Cantat-Gaudin et al.	2020	109.296	-13.988	0.709	-1.581	0.929	–
Cantat-Gaudin & Anders	2020	109.296	-13.988	0.709	-1.581	0.929	–
Liu & Pang	2019	109.299	-13.973	0.703	-1.613	0.919	–
Soubiran et al.	2018	109.296	-13.988	–	–	–	80.49
Bica et al.	2019	109.315	-13.962	–	–	–	–
Cantat-Gaudin et al.	2018	109.296	-13.988	0.709	-1.581	0.929	–
Loktin & Popova	2017	89.55	21.964	–	0.659	-1.08	–
Kharchenko et al.	2016	109.272	-13.98	–	–	–	–
Dias et al.	2014	109.275	-13.967	–	-0.94	0.33	–
Kharchenko et al.	2013	109.278	-13.982	–	-1.09	-0.68	–
Bukowiecki et al.	2011	109.304	-13.962	–	–	–	–
Piskunov et al.	2008	109.269	-13.963	–	–	–	–
van den Bergh	2006	109.275	-13.967	–	–	–	–
Kharchenko et al.	2005	109.27	-13.97	–	-2.49	1.0	–
Kharchenko et al.	2003	109.27	-13.97	–	-2.55	1.58	–
Dias et al.	2002	109.275	-13.967	–	-0.94	0.33	–

💡 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–	1.36	0.56	0.84	88	-0.041	242	0.52	–
Li et al.	2025	1.27	0.55	–	80	-0.164	–	–	–
Almeida et al.	2025	1.36	0.65	–	80	–	305	–	–
Hunt & Reffert	2024	–	–	–	–	–	425⁽¹⁾	–	–
Cavallo et al.	2024	1.34	0.49	–	95	0.130	–	–	–
Hunt & Reffert	2023	1.31	0.27	0.84	135	–	–	–	–
Almeida et al.	2023	1.32	0.58	–	109	-0.126	242⁽¹⁾	0.52	–
Just et al.	2023	–	–	–	26	–	148	–	–
Tarricq et al.	2022	1.32	–	–	100	–	–	–	–
Dias et al.	2021	1.36	0.65	–	80	-0.041	–	–	–
Cantat-Gaudin et al.	2020	1.36	0.33	–	95	–	–	–	–
Cantat-Gaudin & Anders	2020	1.35	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	40	0.250	–	–	–
Soubiran et al.	2018	1.35	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.35	–	–	–	–	–	–	–
Loktin & Popova	2017	2.15	1.09	–	550	–	–	–	–
Kharchenko et al.	2016	1.54	0.64	–	26	–	–	–	–
Kharchenko et al.	2013	1.54	0.64	–	26	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	208	–	–
Bukowiecki et al.	2011	1.46⁽¹⁾	0.34	–	158	–	–	–	–
Piskunov et al.	2008	1.50	0.56	–	26	–	–	–	–
van den Bergh	2006	1.52	0.00	–	200	–	–	–	–
Kharchenko et al.	2005	1.50	0.56	–	26	–	–	–	–
Kharchenko et al.	2003	1.92	0.90	–	–	–	–	–	–
Dias et al.	2002	1.52	0.00	–	200	–	–	–	–

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

Visualization

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