Ruprecht 31

(MWSC 1317; OCL 711; ESO 368 09)

0.37 UTI

0.26

C_N

0.05

C_dens

0.75

C_C3

0.39

C_lit

1.0

C_dup

N_m (P>50%) 26

Core radius and density 3.5 [pc], 0.3 [pc^-2]

C3 classification BA

C_N 0.26 Poorly populated
C_dens 0.05 Very loose
C_C3 0.75 High quality
C_lit 0.39 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 31 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is poorly studied in the literature.

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

Close Low extinction Low mass Intermediate age

Data

🔍 Search references for Ruprecht 31 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–	115.71	-35.304	2.3	-8.254	4.267	17.399
Just et al.	2023	115.743	-35.591	–	–	–	–
He et al.	2022	115.367	-35.111	2.313	-8.168	4.314	–
Bica et al.	2019	115.741	-35.588	–	–	–	–
Angelo et al.	2019	115.75	-35.6	–	–	–	–
Loktin & Popova	2017	115.74	-35.597	–	-11.57	7.746	–
Sampedro et al.	2017	115.742	-35.597	–	–	–	–
Joshi et al.	2016	115.747	-35.593	–	–	–	–
Kharchenko et al.	2016	115.743	-35.591	–	–	–	–
Kharchenko et al.	2013	115.747	-35.593	–	-4.9	3.65	–
Piskunov et al.	2008	115.737	-35.602	–	–	–	–
Kharchenko et al.	2005	115.74	-35.6	–	-4.73	2.2	–
Kharchenko et al.	2003	115.75	-35.59	–	-3.28	1.43	–
Lynga	1987	115.686	-35.59	–	–	–	–

💡 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–	0.54	0.33	–	447	–	8	–	–
Just et al.	2023	–	–	–	447	–	1	–	–
He et al.	2022	–	0.60	–	35	–	–	–	–
Angelo et al.	2019	2.29	–	–	790	–	27	–	–
Loktin & Popova	2017	2.72	1.23	–	457	–	–	–	–
Joshi et al.	2016	0.54	0.33	–	447	–	8	–	–
Kharchenko et al.	2016	0.54	0.33	–	447	–	–	–	–
Kharchenko et al.	2013	0.54	0.33	–	447	–	–	–	–
Piskunov et al.	2008	0.48	0.28	–	363	–	–	–	–
Kharchenko et al.	2005	0.48	0.28	–	363	–	–	–	–
Kharchenko et al.	2003	0.56	0.63	–	–	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OCSN 84	92.3	115.03	-34.48	2.3	-8.25	4.28	16.39	0.2

💡 Note: The % column shows the percentage of members that Ruprecht 31 shares with each listed object.

Visualization

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