Ruprecht 23

(FSR 1286; MWSC 1248; OCL 632; ESO 492 17; FoF 90)

0.82 UTI

0.8

C_N

1.0

C_dens

0.75

C_C3

0.77

C_lit

1.0

C_dup

N_m (P>50%) 240

Core radius and density 1.5 [pc], 6.6 [pc^-2]

C3 classification AB

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.77 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 23 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is well-studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.4226, e_all=0.1099.

Data

🔍 Search references for Ruprecht 23 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–	112.663	-23.375	0.342	-2.065	1.61	59.894
Li et al.	2025	112.665	-23.383	0.341	-2.078	1.56	–
Almeida et al.	2025	112.669	-23.387	–	–	–	–
Hunt & Reffert	2024	112.658	-23.38	0.344	-2.058	1.624	55.244
Cavallo et al.	2024	112.654	-23.368	0.346	–	–	–
Hunt & Reffert	2023	112.658	-23.38	0.344	-2.058	1.624	55.244
Just et al.	2023	112.644	-23.381	–	–	–	–
Jadhav & Subramaniam	2021	112.665	-23.383	–	–	–	–
Dias et al.	2021	112.669	-23.387	0.34	-2.081	1.553	54.405
Cantat-Gaudin et al.	2020	112.665	-23.383	0.341	-2.078	1.56	–
Cantat-Gaudin & Anders	2020	112.665	-23.383	0.341	-2.078	1.56	–
Liu & Pang	2019	112.65	-23.378	0.349	-2.032	1.549	–
Soubiran et al.	2018	112.665	-23.383	–	–	–	56.31
Bica et al.	2019	112.671	-23.375	–	–	–	–
Cantat-Gaudin et al.	2018	112.665	-23.383	0.341	-2.078	1.56	–
Dias et al.	2018	–	–	–	-2.43	2.06	–
Loktin & Popova	2017	112.65	-23.395	–	-2.537	2.82	–
Sampedro et al.	2017	112.662	-23.393	–	-2.21	1.98	–
Kharchenko et al.	2016	112.644	-23.381	–	–	–	–
Dias et al.	2014	112.662	-23.393	–	-2.75	2.68	–
Kharchenko et al.	2013	112.65	-23.383	–	-1.89	3.53	–
Bukowiecki et al.	2011	112.662	-23.385	–	–	–	–
Froebrich et al.	2007	112.667	-23.394	–	–	–	–
Dias et al.	2002	112.662	-23.393	–	-2.75	2.68	–
Lynga	1987	112.601	-23.342	–	–	–	–

💡 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–	2.7	1.725	1.48	603	-0.090	877	–	0
Li et al.	2025	2.50	2.00	–	407	-0.090	–	–	–
Almeida et al.	2025	1.89	1.18	–	902	–	538	–	–
Hunt & Reffert	2024	2.61	1.75	1.48	479	–	892⁽¹⁾	–	–
Cavallo et al.	2024	2.54	2.10	–	479	-0.090	–	–	–
Hunt & Reffert	2023	2.61	1.75	1.48	479	–	–	–	–
Just et al.	2023	–	–	–	603	–	499	–	–
Jadhav & Subramaniam	2021	2.73	1.49	–	407	–	877	–	0⁽¹⁾
Dias et al.	2021	1.89	1.18	–	902	0.245	–	–	–
Cantat-Gaudin et al.	2020	2.73	1.49	–	407	–	–	–	–
Kounkel et al.	2020	2.85	2.08	–	513	–	–	–	–
Cantat-Gaudin & Anders	2020	2.70	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	851	-1.000	–	–	–
Soubiran et al.	2018	2.70	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.70	–	–	–	–	–	–	–
Loktin & Popova	2017	2.85	1.31	–	1622	–	–	–	–
Kharchenko et al.	2016	3.02	1.97	–	603	–	–	–	–
Kharchenko et al.	2013	3.02	1.97	–	603	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1557	–	–
Bukowiecki et al.	2011	2.15⁽¹⁾	1.36	–	891	–	–	–	–
Dias et al.	2002	3.06	1.70	–	603	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1592	1.2	112.67	-23.15	0.32	-1.76	1.72	–	0.17

💡 Note: The % column shows the percentage of members that Ruprecht 23 shares with each listed object.

Visualization

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