Basel 20

(MWSC 1680)

0.19 UTI

0.0

C_N

0.03

C_dens

0.12

C_C3

0.4

C_lit

1.0

C_dup

N₅₀ (P>50% members) 15

Stellar density (N₅₀/rad) 0.2 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.03 Very loose
C_C3 0.12 Very low quality
C_lit 0.4 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Basel 20 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as a young cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.49 kpc) differs significantly from the median photometric distance (~1.99 kpc).

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Moderate extinction Young

Data

🔍 Search references for Basel 20 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–	142.803	-56.461	0.223	-4.326	3.512	22.276
Just et al.	2023	142.743	-56.427	–	–	–	–
Loktin & Popova	2017	142.785	-56.417	–	-7.013	6.188	–
Kharchenko et al.	2016	142.743	-56.427	–	–	–	–
Dias et al.	2014	142.783	-56.417	–	-2.94	2.95	–
Kharchenko et al.	2013	142.747	-56.43	–	-4.08	7.33	–
van den Bergh	2006	143.15	-56.317	–	–	–	–
Dias et al.	2002	142.783	-56.417	–	-2.94	2.95	–

💡 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–	1.99	1.31	–	30	–	99	–	–
Just et al.	2023	–	–	–	32	–	99	–	–
Loktin & Popova	2017	1.99	1.31	–	27	–	–	–	–
Kharchenko et al.	2016	1.38	1.94	–	32	–	–	–	–
Kharchenko et al.	2013	1.38	1.94	–	32	–	–	–	–
van den Bergh	2006	2.02	1.27	–	26	–	–	–	–
Dias et al.	2002	2.02	1.26	–	26	–	–	–	–

Visualization

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