Ruprecht 20

(MWSC 1224)

0.17 UTI

0.0

C_N

0.02

C_dens

0.12

C_C3

0.35

C_lit

1.0

C_dup

N_m (P>50%) 18

Core radius and density 6.1 [pc], 0.08 [pc^-2]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.12 Very low quality
C_lit 0.35 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 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 low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.77 kpc) differs significantly from the median photometric distance (~1.87 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 Low extinction Near-solar metallicity Intermediate age

Data

🔍 Search references for Ruprecht 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–	111.666	-28.806	0.266	-1.512	2.721	134.539
Just et al.	2023	111.637	-28.797	–	–	–	–
Dias et al.	2018	–	–	–	-2.27	2.78	–
Dib et al.	2018	111.642	-28.8	–	–	–	–
Loktin & Popova	2017	111.675	-28.817	–	-2.329	1.424	29.9
Sampedro et al.	2017	111.679	-28.817	–	-0.5	1.12	–
Kharchenko et al.	2016	111.637	-28.797	–	–	–	–
Dias et al.	2014	111.679	-28.817	–	-0.67	1.0	–
Kharchenko et al.	2013	111.642	-28.8	–	-1.83	1.88	29.9
Gozha et al.	2012	111.679	-28.817	–	–	–	–
van den Bergh	2006	111.671	-28.83	–	–	–	–
Dias et al.	2002	111.679	-28.817	–	-0.67	1.0	–
Lynga	1987	111.672	-28.886	–	–	–	–

💡 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–	1.87	0.39	–	794	-0.290	97	–	–
Just et al.	2023	–	–	–	2512	–	97	–	–
Dib et al.	2018	1.87	–	–	2512	–	–	–	–
Loktin & Popova	2017	3.40	1.09	–	794	–	–	–	–
Kharchenko et al.	2016	1.87	0.39	–	2512	–	–	–	–
Kharchenko et al.	2013	1.87	0.39	–	2512	–	–	–	–
Gozha et al.	2012	1.21	–	–	316	-0.290	–	–	–
Paunzen et al.	2010	–	–	–	–	-0.290	–	–	–
van den Bergh	2006	1.21	0.32	–	316	–	–	–	–
Dias et al.	2002	1.21	0.32	–	316	-0.290	–	–	–
Lynga	1987	–	–	–	316	–	–	–	–

Visualization

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