Ruprecht 166

(OCL 899; ESO 096 11; MWSC 2119)

0.47 UTI

0.26

C_N

0.65

C_dens

0.75

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 26

Stellar density (N₅₀/rad) 3.2 [N/pc²]

C3 classification BA

C_N 0.26 Poorly populated
C_dens 0.65 Moderately dense
C_C3 0.75 High quality
C_lit 0.35 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 166 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a large^* distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, metal-poor, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~8.12 kpc) differs significantly from the median photometric distance (~5.11 kpc).

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

Very distant High extinction Massive Metal-poor Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Ruprecht 166 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–	201.416	-63.459	0.123	-6.938	-1.134	-38.099
Hunt & Reffert	2024	201.399	-63.459	0.119	-6.948	-1.136	-33.78
Cavallo et al.	2024	201.431	-63.451	0.118	–	–	–
Hunt & Reffert	2023	201.399	-63.459	0.119	-6.948	-1.136	-33.78
Bica et al.	2019	201.403	-63.449	–	–	–	–
Dias et al.	2014	201.413	-63.467	–	-4.01	-2.24	–
Dias et al.	2002	201.412	-63.467	–	-3.93	-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]	B_frac	BSS
UCC	99999–	5.11	3.045	2.41	171	-0.840	1606	–	–
Hunt & Reffert	2024	–	–	–	–	–	1606⁽¹⁾	–	–
Cavallo et al.	2024	2.55	2.99	–	331	-0.840	–	–	–
Hunt & Reffert	2023	7.67	3.10	2.41	11	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1351	88.5	201.42	-63.45	0.12	-6.95	-1.14	-38.1	0.02

💡 Note: The % column shows the percentage of members that Ruprecht 166 shares with each listed object.

Visualization

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