Collinder 275

(MWSC 2138; OCL 908; ESO 132 13)

0.18 UTI

0.0

C_N

0.0

C_dens

0.38

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 20

Core radius and density 7.3 [pc], 0.02 [pc^-2]

C3 classification CB

C_N 0.0 Sparse
C_dens 0.0 Very loose
C_C3 0.38 Low quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Collinder 275 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* 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 (~7.94 kpc) differs significantly from the median photometric distance (~1.95 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

Dias et al. (2022)
Likely not a real open cluster.

Data

🔍 Search references for Collinder 275 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–	203.695	-60.211	0.126	-7.827	-1.94	-47.892
Just et al.	2023	203.621	-60.21	–	–	–	–
Bica et al.	2019	203.84	-60.187	–	–	–	–
Dias et al.	2018	–	–	–	-6.34	-2.22	–
Dib et al.	2018	203.632	-60.213	–	–	–	–
Sampedro et al.	2017	203.662	-60.2	–	-2.25	-3.92	–
Kharchenko et al.	2016	203.621	-60.21	–	–	–	–
Dias et al.	2014	203.663	-60.2	–	-1.93	-3.84	–
Kharchenko et al.	2013	203.632	-60.213	–	-9.36	2.58	–
Dias et al.	2002	203.662	-60.2	–	-1.93	-3.84	–
Lynga	1987	203.658	-60.132	–	–	–	–

💡 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–	1.95	1.44	–	398	–	174	–	–
Just et al.	2023	–	–	–	398	–	174	–	–
Dib et al.	2018	1.95	–	–	398	–	–	–	–
Kharchenko et al.	2016	1.95	1.44	–	398	–	–	–	–
Kharchenko et al.	2013	1.95	1.44	–	398	–	–	–	–
Dias et al.	2002	1.95	1.44	–	398	–	–	–	–

Visualization

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