Ruprecht 17

(MWSC 1202)

0.24 UTI

0.26

C_N

0.03

C_dens

0.25

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 4.2 [pc], 0.2 [pc^-2]

C3 classification CC

C_N 0.26 Poorly populated
C_dens 0.03 Very loose
C_C3 0.25 Low quality
C_lit 0.32 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 17 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a low-mass, metal-rich, intermediate-age cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Low extinction Low mass Metal-rich Intermediate age

Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P32, along with HSC_1905.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.90 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.90 (50th percentile).

Data

🔍 Search references for Ruprecht 17 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–	110.992	-23.247	0.867	-4.062	3.78	41.908
Cavallo et al.	2024	110.947	-23.232	0.849	–	–	–
Hunt & Reffert	2023	110.827	-23.24	0.846	-4.147	3.788	32.506
Just et al.	2023	110.901	-23.183	–	–	–	–
Dib et al.	2018	110.907	-23.185	–	–	–	–
Loktin & Popova	2017	110.895	-23.187	–	-3.096	3.561	–
Sampedro et al.	2017	110.9	-23.183	–	-3.23	2.88	–
Joshi et al.	2016	110.907	-23.185	–	–	–	–
Kharchenko et al.	2016	110.901	-23.183	–	–	–	–
Dias et al.	2014	110.9	-23.183	–	-2.93	5.08	–
Kharchenko et al.	2013	110.907	-23.185	–	-3.99	3.73	–
Dias et al.	2002	110.9	-23.183	–	-2.93	5.08	–
Lynga	1987	110.908	-23.215	–	–	–	–

💡 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–	1.26	0.92	0.95	211	0.550	41	–	–
Cavallo et al.	2024	1.12	0.00	–	288	0.550	–	–	–
Hunt & Reffert	2023	1.14	0.14	0.95	110	–	–	–	–
Just et al.	2023	–	–	–	211	–	41	–	–
Dib et al.	2018	1.26	–	–	211	–	–	–	–
Loktin & Popova	2017	1.68	0.59	–	1096	–	–	–	–
Joshi et al.	2016	1.26	0.92	–	211	–	–	–	–
Kharchenko et al.	2016	1.26	0.92	–	211	–	–	–	–
Kharchenko et al.	2013	1.26	0.92	–	211	–	–	–	–
Dias et al.	2002	1.26	0.92	–	211	–	–	–	–

Visualization

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