Ruprecht 84

(MWSC 1717; OCL 814; ESO 091 19; FSR 1544; FoF 666)

0.91 UTI

0.78

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 172

Radius (P>50% members) 4.6 [arcmin]

C_N 0.78 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

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

Overview

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Ruprecht 84 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, below 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 metallicity parameter (see Parameters). It is very 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 84 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	–	147.285	-65.271	0.517	-6.941	4.024	-3.092
Li et al.	2025	147.281	-65.259	0.491	-6.963	3.997	–
Hu & Soubiran	2025	147.239	-65.272	–	–	–	–
Wei et al.	2025	147.306	-65.254	0.525	-6.936	4.005	–
Almeida et al.	2025	147.281	-65.261	–	–	–	–
Hunt & Reffert	2024	147.276	-65.261	0.505	-6.961	4.078	3.246
Cavallo et al.	2024	147.239	-65.272	0.51	–	–	–
Hunt & Reffert	2023	147.276	-65.261	0.505	-6.961	4.078	3.246
Almeida et al.	2023	147.288	-65.265	–	–	–	–
Just et al.	2023	147.281	-65.237	–	–	–	–
Dias et al.	2021	147.281	-65.261	0.49	-6.958	4.005	–
Cantat-Gaudin et al.	2020	147.281	-65.259	0.491	-6.963	3.997	–
Sánchez et al.	2020	147.283	-65.25	–	-7.024	3.806	–
Cantat-Gaudin & Anders	2020	147.281	-65.259	0.491	-6.963	3.997	–
Liu & Pang	2019	147.309	-65.283	0.493	-6.941	3.993	–
Bossini et al.	2019	147.281	-65.259	–	–	–	–
Soubiran et al.	2018	147.281	-65.259	–	–	–	-8.63
Bica et al.	2019	147.296	-65.244	–	–	–	–
Cantat-Gaudin et al.	2018	147.281	-65.259	0.491	-6.963	3.997	–
Kharchenko et al.	2016	147.281	-65.237	–	–	–	–
Dias et al.	2014	147.283	-65.25	–	-6.48	2.32	–
Kharchenko et al.	2013	147.285	-65.24	–	-10.29	-0.81	–
Piskunov et al.	2008	147.281	-65.252	–	–	–	–
Kharchenko et al.	2005	147.28	-65.25	–	-8.76	0.88	–
Kharchenko et al.	2003	147.25	-65.28	–	-9.78	-0.6	–
Dias et al.	2002	147.283	-65.25	–	-6.48	2.32	–

💡 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
Li et al.	2025	1.80	0.48	–	366	0.166	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.180*	–	–	–
Wei et al.	2025	2.42	0.62	–	576	0.500	480	0.32	–
Almeida et al.	2025	1.83	0.72	–	207	–	264	–	–
Hunt & Reffert	2024	–	–	–	–	–	577*	–	–
Cavallo et al.	2024	1.78	0.46	–	661	0.180	–	–	–
Hunt & Reffert	2023	1.83	0.44	1.07	494	–	–	–	–
Almeida et al.	2023	1.79	0.74	–	207	-0.007	347*	0.45	–
Just et al.	2023	–	–	–	363	–	356	–	–
Dias et al.	2021	1.83	0.72	–	207	0.151	–	–	–
Cantat-Gaudin et al.	2020	1.73	0.45	–	347	–	–	–	–
Cantat-Gaudin & Anders	2020	1.92	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	513	0.000	–	–	–
Bossini et al.	2019	1.84	0.53	–	302	0.000	–	–	–
Soubiran et al.	2018	1.92	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.92	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.55	0.52	–	363	–	–	–	–
Kharchenko et al.	2013	1.55	0.52	–	363	–	–	–	–
Piskunov et al.	2008	1.80	0.31	–	363	–	–	–	–
Kharchenko et al.	2005	1.80	0.31	–	363	–	–	–	–
Kharchenko et al.	2003	2.50	0.16	–	–	–	–	–	–
Dias et al.	2002	1.80	0.31	–	363	–	–	–	–

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

Visualization

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