Ruprecht 20

(MWSC 1224)

0.24 UTI

0.0

C_N

0.07

C_dens

0.12

C_C3

0.5

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 18

Radius (P>50% members) 6.7 [arcmin]

C_N 0.0 Sparse
C_dens 0.07 Very loose
C_C3 0.12 Very low quality
C_lit 0.5 Moderately studied
C_dup 1.0 Unique

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

Overview

ℹ️

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 moderately studied in the literature.

(*): The parallax distance estimate (~3.77 kpc) differs significantly from the median photometric distance (~1.54 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

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	111.666	-28.806	0.266	-1.512	2.721	134.539
Just et al.	2023	111.637	-28.797	–	–	–	–
Loktin & Popova	2017	111.675	-28.817	–	-2.329	1.424	29.9
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	–

💡 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	–	–	–	2512	–	97	–	–
Loktin & Popova	2017	3.40	1.07	–	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	–	–	–
van den Bergh	2006	1.21	0.31	–	316	–	–	–	–
Dias et al.	2002	1.21	0.31	–	316	-0.290	–	–	–

Visualization

ℹ️