Ruprecht 173

(MWSC 3397; OCL 165)

0.18 UTI

0.0

C_N

0.13

C_dens

0.12

C_C3

0.31

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 15

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

C_N 0.0 Sparse
C_dens 0.13 Very loose
C_C3 0.12 Very low quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

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

Overview

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Ruprecht 173 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, below the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.53 kpc) differs significantly from the median photometric distance (~1.79 kpc).

⚠️ 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 Moderate extinction Intermediate age

Data

🔍 Search references for Ruprecht 173 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	–	310.475	35.579	0.283	-4.573	-5.344	-28.285
Just et al.	2023	310.45	35.582	–	–	–	–
Bica et al.	2019	310.532	35.536	–	–	–	–
Kharchenko et al.	2016	310.45	35.582	–	–	–	–
Dias et al.	2014	310.45	35.55	–	-3.52	-5.19	-7.1
Kharchenko et al.	2013	310.455	35.585	–	-1.47	-2.43	–

💡 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
Just et al.	2023	–	–	–	631	–	800	–	–
Kharchenko et al.	2016	1.79	2.26	–	631	–	–	–	–
Kharchenko et al.	2013	1.79	2.26	–	631	–	–	–	–

Visualization

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