Ruprecht 40

(MWSC 1265)

0.16 UTI

0.0

C_N

0.05

C_dens

0.25

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 17

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.25 Low quality
C_lit 0.25 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 40 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~3.49 kpc) differs significantly from the median photometric distance (~1.84 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 Low extinction Low mass Intermediate age

Data

🔍 Search references for Ruprecht 40 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–	113.36	-20.465	0.287	-1.785	2.542	72.829
Just et al.	2023	113.36	-20.508	–	–	–	–
Kharchenko et al.	2016	113.36	-20.508	–	–	–	–
Kharchenko et al.	2013	113.365	-20.51	–	-2.87	1.66	–
Bukowiecki et al.	2011	113.371	-20.498	–	–	–	–

💡 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–	1.84	0.78	–	184	–	24	–	–
Just et al.	2023	–	–	–	184	–	24	–	–
Kharchenko et al.	2016	1.84	0.78	–	184	–	–	–	–
Kharchenko et al.	2013	1.84	0.78	–	184	–	–	–	–

Visualization

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