Ruprecht 33

(MWSC 1332)

0.82 UTI

0.76

C_N

0.88

C_dens

0.75

C_C3

0.86

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 126

Radius (P>50% members) 7.7 [arcmin]

C_N 0.76 Rich
C_dens 0.88 Dense
C_C3 0.75 High quality
C_lit 0.86 Well-studied
C_dup 1.0 Unique

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

Overview

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Ruprecht 33 is a rich, dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Ruprecht 33 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	–	116.439	-21.916	0.419	-1.39	0.065	48.266
Hu & Soubiran	2025	116.442	-21.91	–	–	–	–
Almeida et al.	2025	116.461	-21.91	–	–	–	–
Hunt & Reffert	2024	116.445	-21.917	0.415	-1.384	0.065	51.219
Cavallo et al.	2024	116.442	-21.91	0.418	–	–	–
He et al.	2023	116.36	-21.999	0.289	-2.19	2.961	–
Hunt & Reffert	2023	116.445	-21.917	0.415	-1.384	0.065	51.219
Just et al.	2023	116.477	-21.918	–	–	–	–
Dias et al.	2021	116.461	-21.91	0.411	-1.388	0.067	–
Cantat-Gaudin et al.	2020	116.445	-21.915	0.417	-1.384	0.058	–
Cantat-Gaudin & Anders	2020	116.445	-21.915	0.417	-1.384	0.058	–
Soubiran et al.	2018	116.445	-21.915	–	–	–	48.1
Cantat-Gaudin et al.	2018	116.445	-21.915	0.417	-1.384	0.058	–
Loktin & Popova	2017	116.475	-21.92	–	-5.714	1.823	–
Kharchenko et al.	2016	116.477	-21.918	–	–	–	–
Dias et al.	2014	116.492	-21.95	–	-3.67	-1.15	–
Kharchenko et al.	2013	116.482	-21.92	–	-4.34	2.35	–

💡 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
Hu & Soubiran	2025	–	–	–	–	-0.150*	–	–	–
Almeida et al.	2025	1.96	1.13	–	286	–	276	–	–
Hunt & Reffert	2024	–	–	–	–	–	558*	–	–
Cavallo et al.	2024	2.06	0.87	–	537	0.230	–	–	–
He et al.	2023	3.09	1.35	–	25	–	–	–	–
Hunt & Reffert	2023	2.18	0.94	0.90	308	–	–	–	–
Just et al.	2023	–	–	–	646	–	42	–	–
Dias et al.	2021	1.96	1.13	–	286	-0.078	–	–	–
Cantat-Gaudin et al.	2020	2.37	0.82	–	269	–	–	–	–
Cantat-Gaudin & Anders	2020	2.24	–	–	–	–	–	–	–
Soubiran et al.	2018	2.24	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.24	–	–	–	–	–	–	–
Loktin & Popova	2017	2.99	0.86	–	170	–	–	–	–
Kharchenko et al.	2016	1.56	0.36	–	646	–	–	–	–
Kharchenko et al.	2013	1.56	0.36	–	646	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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