Ruprecht 122

(VDBH 202; van den Bergh-Hagen 202; BH 202; vdBergh-Hagen 202; ESO 332 09; MWSC 2486)

0.84 UTI

0.89

C_N

1.0

C_dens

1.0

C_C3

0.65

C_lit

1.0

C_dup

N_m (P>50%) 476

Core radius and density 1.4 [pc], 16 [pc^-2]

C3 classification AA

C_N 0.89 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.65 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 122 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above 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 and mass parameters (see Parameters). It is moderately 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

Palma et al. (2025)
Classified as optical pair P272, along with BH_211.

Almeida et al. (2025)
Mass determination: intermediate 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=0.0575, e_all=0.1225.

Data

🔍 Search references for Ruprecht 122 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–	253.787	-40.949	0.565	-1.871	-3.796	-49.302
Li et al.	2025	253.779	-40.947	0.551	-1.869	-3.802	–
Hu & Soubiran	2025	253.783	-40.947	–	–	–	–
Almeida et al.	2025	253.777	-40.943	–	–	–	–
Hunt & Reffert	2024	253.787	-40.957	0.569	-1.875	-3.795	-49.618
Cavallo et al.	2024	253.783	-40.947	0.57	–	–	–
Hunt & Reffert	2023	253.787	-40.957	0.569	-1.875	-3.795	-49.618
Jadhav & Subramaniam	2021	253.779	-40.947	–	–	–	–
Dias et al.	2021	253.777	-40.943	0.555	-1.87	-3.788	-49.77
Cantat-Gaudin et al.	2020	253.779	-40.947	0.551	-1.869	-3.802	–
Cantat-Gaudin & Anders	2020	253.779	-40.947	0.551	-1.869	-3.802	–
Soubiran et al.	2018	253.779	-40.947	–	–	–	-50.06
Bica et al.	2019	253.788	-40.951	–	–	–	–
Cantat-Gaudin et al.	2018	253.779	-40.947	0.551	-1.869	-3.802	–
Dib et al.	2018	253.795	-40.94	–	–	–	–
Sampedro et al.	2017	253.783	-40.95	–	-3.18	-2.57	–
Dias et al.	2014	253.783	-40.95	–	-2.55	-2.89	–
Bukowiecki et al.	2011	253.762	-40.953	–	–	–	–
Dias et al.	2002	253.783	-40.95	–	-2.55	-2.89	–
Lynga	1987	253.826	-40.948	–	–	–	–
van den Bergh & Hagen	1975	252.95	-40.867	–	–	–	–

💡 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–	1.63	1.89	1.29	380	0.069	714	–	0
Li et al.	2025	1.88	1.95	–	472	0.341	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.270⁽⁵⁾	–	–	–
Almeida et al.	2025	1.50	1.89	–	579	–	629	–	–
Hunt & Reffert	2024	1.63	1.82	1.29	377	–	3284⁽¹⁾	–	–
Cavallo et al.	2024	1.45	2.00	–	617	0.020	–	–	–
Hunt & Reffert	2023	1.63	1.82	1.29	377	–	–	–	–
Jadhav & Subramaniam	2021	1.75	1.84	–	380	–	694	–	0⁽¹⁾
Dias et al.	2021	1.50	1.89	–	579	0.118	–	–	–
Cantat-Gaudin et al.	2020	1.75	1.84	–	380	–	–	–	–
Kounkel et al.	2020	1.80	2.10	–	550	–	–	–	–
Cantat-Gaudin & Anders	2020	1.72	–	–	–	–	–	–	–
Soubiran et al.	2018	1.72	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.72	–	–	–	–	–	–	–
Dib et al.	2018	1.13	–	–	40	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	734	–	–
Bukowiecki et al.	2011	1.62⁽¹⁾	2.65	–	112	–	–	–	–
Dias et al.	2002	1.61	2.74	–	112	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
VDBH 203	5.3	253.83	-40.93	0.58	-1.91	-3.75	-50.18	0.0

💡 Note: The % column shows the percentage of members that Ruprecht 122 shares with each listed object.

Visualization

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