ESO 520 20

(MWSC 2668)

0.15 UTI

0.0

C_N

0.0

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DB

Number of members (P>50%) 18

Radius (P>50% members) 9.4 [arcmin]

C_N 0.0 Sparse
C_dens 0.0 Very loose
C_C3 0.25 Low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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ESO 520 20 is a sparse, very loose object of low C3 quality. Its parallax locates it at a very large^* distance, well above the mid-plane, affected by very high extinction. It is catalogued as a low-mass, old cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~17.18 kpc) differs significantly from the median photometric distance (~2.04 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 Very high extinction Low mass Old

Dias et al. (2002)
Not found (Archinal, B. A. & Hynes, S. J. 2003)

Data

🔍 Search references for ESO 520 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	–	265.901	-24.711	0.058	-2.897	-2.999	-16.663
Just et al.	2023	265.891	-24.719	–	–	–	–
Bica et al.	2019	265.896	-24.719	–	–	–	–
Kharchenko et al.	2016	265.891	-24.719	–	–	–	–
Kharchenko et al.	2013	265.9	-24.718	–	-4.22	-8.76	–

💡 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]	Bfr	BSS
Just et al.	2023	–	–	–	1413	–	23	–	–
Kharchenko et al.	2016	2.04	7.23	–	1413	–	–	–	–
Kharchenko et al.	2013	2.04	7.23	–	1413	–	–	–	–

Visualization

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