Ruprecht 104

(MWSC 2028; OCL 879; ESO 131 04)

0.18 UTI

0.0

C_N

0.04

C_dens

0.12

C_C3

0.38

C_lit

1.0

C_dup

C3 classification DC

Number of members (P>50%) 20

Radius (P>50% members) 8.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.12 Very low quality
C_lit 0.38 Poorly studied
C_dup 1.0 Unique

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

Overview

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Ruprecht 104 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 an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.27 kpc) differs significantly from the median photometric distance (~2.70 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 104 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	–	186.174	-60.454	0.234	-7.615	1.32	-53.334
Just et al.	2023	186.245	-60.441	–	–	–	–
Bica et al.	2019	186.202	-60.432	–	–	–	–
Kharchenko et al.	2016	186.245	-60.441	–	–	–	–
Dias et al.	2014	186.221	-60.433	–	-2.31	-2.25	–
Kharchenko et al.	2013	186.255	-60.445	–	-10.99	-5.09	–
Dias et al.	2002	186.221	-60.433	–	-2.31	-2.25	–

💡 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	–	–	–	776	–	251	–	–
Kharchenko et al.	2016	2.70	2.33	–	776	–	–	–	–
Kharchenko et al.	2013	2.70	2.33	–	776	–	–	–	–
Dias et al.	2002	2.70	2.33	–	776	–	–	–	–

Visualization

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