Ruprecht 57

(MWSC 1457; OCL 686; ESO 494 37)

0.21 UTI

0.0

C_N

0.06

C_dens

0.25

C_C3

0.38

C_lit

1.0

C_dup

C3 classification CC

Number of members (P>50%) 18

Radius (P>50% members) 6.5 [arcmin]

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.25 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 57 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate^* distance, above the mid-plane, affected by low extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

(*): The parallax distance estimate (~4.08 kpc) differs significantly from the median photometric distance (~1.76 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 Intermediate age

Data

🔍 Search references for Ruprecht 57 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	–	123.808	-26.932	0.245	-2.587	4.071	29.044
Just et al.	2023	123.789	-26.967	–	–	–	–
Bica et al.	2019	123.766	-26.975	–	–	–	–
Kharchenko et al.	2016	123.789	-26.967	–	–	–	–
Dias et al.	2014	123.771	-26.967	–	-0.86	4.19	–
Kharchenko et al.	2013	123.795	-26.97	–	-5.02	5.53	–
Dias et al.	2002	123.771	-26.967	–	-0.86	4.19	–

💡 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	–	–	–	944	–	132	–	–
Kharchenko et al.	2016	1.76	0.64	–	944	–	–	–	–
Kharchenko et al.	2013	1.76	0.64	–	944	–	–	–	–
Dias et al.	2002	1.76	0.64	–	944	–	–	–	–

Visualization

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