Ruprecht 155

(MWSC 1429)

0.22 UTI

0.0

C_N

0.01

C_dens

0.75

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 14

Core radius and density 7.4 [pc], 0.04 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.75 High quality
C_lit 0.16 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Ruprecht 155 is a sparse, very loose object of high C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is rarely studied in the literature.

(*): The parallax distance estimate (~3.95 kpc) differs significantly from the median photometric distance (~2.31 kpc).

Note: This object shares a small percentage of members with 2 later reported entries. See table with shared members information.

⚠️ 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

Cantat-Gaudin & Anders (2020)
Listed as a remnant in catalogues but never studied in detail; physical nature uncertain. More details in Appendix A of the article.

Data

🔍 Search references for Ruprecht 155 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–	121.273	-31.81	0.253	-2.442	2.807	–
Just et al.	2023	121.262	-31.814	–	–	–	–
Sampedro et al.	2017	121.271	-31.817	–	-1.7	-0.57	–
Kharchenko et al.	2016	121.262	-31.814	–	–	–	–
Dias et al.	2014	121.271	-31.817	–	-2.5	-0.63	–
Kharchenko et al.	2013	121.267	-31.817	–	0.61	0.71	–
Bukowiecki et al.	2011	121.263	-31.809	–	–	–	–
Lynga	1987	121.24	-31.797	–	–	–	–

💡 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–	2.31	1.77	–	372	–	71	–	–
Just et al.	2023	–	–	–	372	–	71	–	–
Kharchenko et al.	2016	2.31	1.77	–	372	–	–	–	–
Kharchenko et al.	2013	2.31	1.77	–	372	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
FoF 204	24.0	121.44	-31.6	0.24	-2.45	2.85	–	0.24
HSC 2006	20.0	121.46	-31.6	0.25	-2.46	2.83	–	0.07

💡 Note: The % column shows the percentage of members that Ruprecht 155 shares with each listed object.

Visualization

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