Ruprecht 39

(MWSC 1368; OCL 645; ESO 560 18)

0.14 UTI

0.0

C_N

0.08

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 18

Radius (P>50% members) 5.5 [arcmin]

C_N 0.0 Sparse
C_dens 0.08 Very loose
C_C3 0.12 Very low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

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

Overview

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Ruprecht 39 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by moderate extinction. It is catalogued as a low-mass, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.29 kpc) differs significantly from the median photometric distance (~2.20 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 Low mass Intermediate age

Data

🔍 Search references for Ruprecht 39 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	–	118.101	-22.448	0.233	-2.784	3.459	92.304
Just et al.	2023	118.075	-22.445	–	–	–	–
Bica et al.	2019	118.081	-22.445	–	–	–	–
Kharchenko et al.	2016	118.075	-22.445	–	–	–	–
Kharchenko et al.	2013	118.08	-22.447	–	-1.03	1.21	–

💡 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	–	–	–	251	–	20	–	–
Kharchenko et al.	2016	2.20	1.29	–	251	–	–	–	–
Kharchenko et al.	2013	2.20	1.29	–	251	–	–	–	–

Visualization

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