Ruprecht 1

(MWSC 929; OCL 563; FoF 655)

0.91 UTI

0.77

C_N

0.79

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N_m (P>50%) 159

Core radius and density 1.8 [pc], 4.0 [pc^-2]

C3 classification AA

C_N 0.77 Rich
C_dens 0.79 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 1 is a rich, dense object of very 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 and mass parameters (see Parameters). It is very well-studied in the literature.

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

Relatively close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good 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=0.1156, e_all=0.1568.

Data

🔍 Search references for Ruprecht 1 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–	99.075	-14.166	0.641	-0.299	-0.902	11.208
Li et al.	2025	99.084	-14.157	0.631	-0.316	-0.9	–
Hu & Soubiran	2025	99.058	-14.169	–	–	–	–
Almeida et al.	2025	99.082	-14.151	–	–	–	–
Hunt & Reffert	2024	99.099	-14.167	0.641	-0.293	-0.901	9.39
Cavallo et al.	2024	99.058	-14.169	0.642	–	–	–
Hunt & Reffert	2023	99.099	-14.167	0.641	-0.293	-0.901	9.39
Almeida et al.	2023	99.078	-14.163	–	–	–	–
Just et al.	2023	99.129	-14.192	–	–	–	–
Tarricq et al.	2022	99.094	-14.178	0.651	-0.304	-0.908	–
Dias et al.	2021	99.082	-14.151	0.633	-0.322	-0.899	11.459
Cantat-Gaudin et al.	2020	99.084	-14.157	0.631	-0.316	-0.9	–
Sánchez et al.	2020	99.088	-14.147	–	-0.262	-1.023	–
Cantat-Gaudin & Anders	2020	99.084	-14.157	0.631	-0.316	-0.9	–
Liu & Pang	2019	99.056	-14.158	0.64	-0.305	-0.867	–
Bossini et al.	2019	99.084	-14.157	–	–	–	–
Soubiran et al.	2018	99.084	-14.157	–	–	–	12.52
Bica et al.	2019	99.104	-14.148	–	–	–	–
Cantat-Gaudin et al.	2018	99.084	-14.157	0.631	-0.316	-0.9	–
Dias et al.	2018	–	–	–	-0.94	0.2	–
Dib et al.	2018	99.135	-14.193	–	–	–	–
Loktin & Popova	2017	99.09	-14.146	–	0.064	0.884	–
Sampedro et al.	2017	99.088	-14.147	–	0.11	-1.12	–
Joshi et al.	2016	99.135	-14.193	–	–	–	–
Kharchenko et al.	2016	99.129	-14.192	–	–	–	–
Dias et al.	2014	99.087	-14.147	–	0.49	-0.66	–
Kharchenko et al.	2013	99.135	-14.193	–	0.48	0.44	–
Bukowiecki et al.	2011	99.083	-14.17	–	–	–	–
Piskunov et al.	2008	99.099	-14.183	–	–	–	–
Piskunov et al.	2007	99.099	-14.183	–	–	–	–
Kharchenko et al.	2005	99.1	-14.18	–	2.2	0.1	–
Kharchenko et al.	2003	99.07	-14.17	–	-0.75	-0.74	–
Dias et al.	2002	99.088	-14.147	–	0.49	-0.66	–
Lynga	1987	99.094	-14.174	–	–	–	–

💡 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–	1.45	0.47	0.54	575	-0.065	350	0.53	–
Li et al.	2025	1.45	0.61	–	535	-0.062	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.230⁽⁵⁾	–	–	–
Almeida et al.	2025	1.43	0.74	–	432	–	345	–	–
Hunt & Reffert	2024	1.45	0.26	0.54	487	–	739⁽¹⁾	–	–
Cavallo et al.	2024	1.50	0.28	–	813	0.390	–	–	–
Hunt & Reffert	2023	1.45	0.26	0.54	486	–	–	–	–
Almeida et al.	2023	1.46	0.74	–	484	-0.065	403⁽¹⁾	0.53	–
Just et al.	2023	–	–	–	617	–	30	–	–
Tarricq et al.	2022	1.48	–	–	309	–	–	–	–
Dias et al.	2021	1.43	0.74	–	432	-0.077	–	–	–
Cantat-Gaudin et al.	2020	1.53	0.61	–	288	–	–	–	–
Kounkel et al.	2020	1.48	0.70	–	417	–	–	–	–
Cantat-Gaudin & Anders	2020	1.51	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	576	0.500	–	–	–
Bossini et al.	2019	1.44	0.70	–	318	-0.250	–	–	–
Soubiran et al.	2018	1.51	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.51	–	–	–	–	–	–	–
Dib et al.	2018	1.20	–	–	617	–	–	–	–
Loktin & Popova	2017	2.41	0.28	–	631	–	–	–	–
Joshi et al.	2016	1.20	0.46	–	617	–	355	–	–
Kharchenko et al.	2016	1.20	0.46	–	617	–	–	–	–
Perren et al.	2015	2.00⁽¹⁾	0.00⁽¹⁾	–	1000⁽¹⁾	0.100⁽¹⁾	–	–	–
Kharchenko et al.	2013	1.20	0.46	–	617	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	822	–	–
Bukowiecki et al.	2011	1.64⁽¹⁾	0.41	–	631	–	–	–	–
Piskunov et al.	2008	1.10	0.47	–	575	–	133⁽¹⁾	–	–
Piskunov et al.	2007	1.10	0.47	–	575	–	29	–	–
Kharchenko et al.	2005	1.10	0.47	–	575	–	–	–	–
Kharchenko et al.	2003	1.00	0.63	–	–	–	–	–	–
Dias et al.	2002	1.48	0.54	–	479	-0.250	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FSR 1179	64.2	99.1	-14.17	0.65	-0.29	-0.9	10.98	0.0

💡 Note: The % column shows the percentage of members that Ruprecht 1 shares with each listed object.

Visualization

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