Collinder 138

(NGC 2368; MWSC 1186; OCL 571)

0.13 UTI

0.0

C_N

0.04

C_dens

0.12

C_C3

0.25

C_lit

1.0

C_dup

N₅₀ (P>50% members) 17

Stellar density (N₅₀/rad) 0.2 [N/pc²]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.12 Very 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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Collinder 138 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 massive, intermediate-age cluster (see Parameters). It is poorly studied in the literature.

⚠️ 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.

Distant Moderate extinction Massive Intermediate age

Dias et al. (2002)
No cluster (Piatti, A. E.; Clariá, J. J.; Ahumada, A. V. 2011, NewA 16, 161)

Data

🔍 Search references for Collinder 138 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–	110.264	-10.339	0.256	-1.435	1.285	68.186
Just et al.	2023	110.266	-10.333	–	–	–	–
Bica et al.	2019	110.271	-10.366	–	–	–	–
Kharchenko et al.	2016	110.266	-10.333	–	–	–	–
Kharchenko et al.	2013	110.272	-10.335	–	0.6	4.36	–

💡 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–	4.89	1.48	–	944	–	1774	–	–
Just et al.	2023	–	–	–	944	–	1774	–	–
Kharchenko et al.	2016	4.89	1.48	–	944	–	–	–	–
Kharchenko et al.	2013	4.89	1.48	–	944	–	–	–	–

Visualization

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