Ruprecht 27

(FSR 1305; MWSC 1286; OCL 654; ESO 493 02; FoF 89)

0.95 UTI

0.77

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 141

Stellar density (N₅₀/rad) 17.0 [N/pc²]

C3 classification AA

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very 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 27 is a rich, very dense object of very high 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, but with a large variance across recent sources for the metallicity and mass parameters (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. Gold sample.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Ruprecht 27 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–	114.423	-26.522	0.485	-1.214	0.455	37.105
Li et al.	2025	114.423	-26.516	0.469	-1.23	0.428	–
Wei et al.	2025	114.434	-26.508	0.502	-1.214	0.473	–
Almeida et al.	2025	114.434	-26.516	–	–	–	–
Hunt & Reffert	2024	114.417	-26.513	0.482	-1.217	0.455	47.733
Cavallo et al.	2024	114.423	-26.51	0.483	–	–	–
Hunt & Reffert	2023	114.417	-26.513	0.482	-1.217	0.455	47.733
Just et al.	2023	114.418	-26.505	–	–	–	–
Dias et al.	2021	114.434	-26.516	0.472	-1.243	0.422	–
Cantat-Gaudin et al.	2020	114.423	-26.516	0.469	-1.23	0.428	–
Sánchez et al.	2020	114.421	-26.529	–	-1.198	0.414	–
Cantat-Gaudin & Anders	2020	114.423	-26.516	0.469	-1.23	0.428	–
Liu & Pang	2019	114.438	-26.509	0.476	-1.22	0.484	–
Soubiran et al.	2018	114.423	-26.516	–	–	–	37.21
Bica et al.	2019	114.395	-26.495	–	–	–	–
Cantat-Gaudin et al.	2018	114.423	-26.516	0.469	-1.23	0.428	–
Loktin & Popova	2017	114.42	-26.541	–	-2.741	1.552	10.9
Kharchenko et al.	2016	114.418	-26.505	–	–	–	–
Dias et al.	2014	114.421	-26.529	–	-1.7	1.73	–
Kharchenko et al.	2013	114.423	-26.507	–	-2.64	2.38	10.9
Gozha et al.	2012	114.421	-26.529	–	–	–	–
Piskunov et al.	2008	114.367	-26.532	–	–	–	–
Kharchenko et al.	2007	114.39	-26.5	–	0.18	–	10.9
Froebrich et al.	2007	114.421	-26.494	–	–	–	–
Kharchenko et al.	2005	114.37	-26.53	–	-3.65	2.65	–
Kharchenko et al.	2003	114.43	-26.58	–	-3.44	1.92	–
Dias et al.	2002	114.421	-26.529	–	-1.7	1.73	10.9

💡 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–	1.755	0.815	0.53	566	-0.007	411	0.47	–
Li et al.	2025	1.77	0.97	–	671	-0.049	–	–	–
Wei et al.	2025	2.26	1.18	–	776	-0.250	928	0.47	–
Almeida et al.	2025	1.74	1.12	–	571	–	411	–	–
Hunt & Reffert	2024	–	–	–	–	–	766⁽¹⁾	–	–
Cavallo et al.	2024	2.08	1.02	–	490	0.450	–	–	–
Hunt & Reffert	2023	1.89	0.90	0.53	397	–	–	–	–
Just et al.	2023	–	–	–	257	–	36	–	–
Dias et al.	2021	1.74	1.12	–	571	-0.007	–	–	–
Cantat-Gaudin et al.	2020	2.06	0.91	–	562	–	–	–	–
Cantat-Gaudin & Anders	2020	2.01	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	576	0.250	–	–	–
Soubiran et al.	2018	2.01	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.01	–	–	–	–	–	–	–
Loktin & Popova	2017	2.83	0.73	–	617	–	–	–	–
Kharchenko et al.	2016	0.58	0.46	–	257	–	–	–	–
Kharchenko et al.	2013	0.58	0.46	–	257	–	–	–	–
Gozha et al.	2012	1.25	–	–	891	–	25	–	–
Piskunov et al.	2008	0.56	0.46	–	257	–	–	–	–
Kharchenko et al.	2005	0.56	0.46	–	257	–	–	–	–
Kharchenko et al.	2003	1.25	0.62	–	–	–	–	–	–
Dias et al.	2002	1.49	0.09	–	891	–	–	–	–

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

Visualization

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