NGC 6938

(MWSC 3372)

0.10 UTI

0.0

C_N

0.01

C_dens

0.12

C_C3

0.19

C_lit

1.0

C_dup

N_m (P>50%) 12

Core radius and density 6.2 [pc], 0.06 [pc^-2]

C3 classification DC

C_N 0.0 Sparse
C_dens 0.01 Very loose
C_C3 0.12 Very low quality
C_lit 0.19 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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NGC 6938 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, well below the mid-plane, affected by low extinction. It is catalogued as an old cluster (see Parameters). It is rarely studied in the literature, with no articles listed in the last 7 years.

(*): The parallax distance estimate (~3.68 kpc) differs significantly from the median photometric distance (~1.68 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 Old

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

Bica et al. (2019)
Original NGC and IC catalogues at Vizier: NGC 2000.0, Sky Publishing, ed. Sinnott 1988 (1997yCat.7118....0S).

Data

🔍 Search references for NGC 6938 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–	308.696	22.175	0.272	-2.793	-4.651	–
Bica et al.	2019	308.672	22.216	–	–	–	–
Loktin & Popova	2017	308.67	22.214	–	-0.655	-0.408	–
Sampedro et al.	2017	308.675	22.215	–	0.59	-3.05	–
Tadross	2014	308.675	22.215	–	–	–	–
Dias et al.	2014	308.675	22.215	–	0.63	-3.64	–
Bukowiecki et al.	2011	308.65	22.246	–	–	–	–
Dias et al.	2002	308.675	22.215	–	0.55	-3.55	–

💡 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–	1.68	0.41	–	1294	–	95	–	–
Loktin & Popova	2017	2.27	0.17	–	1622	–	–	–	–
Tadross	2014	1.25	0.41	–	1300	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	95	–	–
Bukowiecki et al.	2011	2.11⁽¹⁾	1.77	–	224	–	–	–	–
Dias et al.	2002	1.25	0.41	–	1288	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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