Dias 4

(MWSC 2154)

0.20 UTI

0.0

C_N

0.04

C_dens

0.62

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 3.3 [pc], 0.2 [pc^-2]

C3 classification AC

C_N 0.0 Sparse
C_dens 0.04 Very loose
C_C3 0.62 Intermediate quality
C_lit 0.16 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Dias 4 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate^* distance, near the mid-plane, affected by moderate 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 (~4.33 kpc) differs significantly from the median photometric distance (~2.15 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 Old

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010).

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.

Data

🔍 Search references for Dias 4 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–	205.841	-63.024	0.231	-8.002	-1.992	-26.503
Bica et al.	2019	205.855	-63.009	–	–	–	–
Dias et al.	2018	–	–	–	-5.73	-2.18	–
Sampedro et al.	2017	205.854	-63.013	–	-3.74	-4.52	–
Tadross	2014	205.917	-63.025	–	–	–	–
Dias et al.	2014	205.854	-63.013	–	-4.26	-5.28	–
Morales et al.	2013	205.854	-63.013	–	–	–	–
Dias et al.	2002	205.854	-63.013	–	-4.26	-5.25	–

💡 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]	B_frac	BSS
UCC	99999–	2.15	1.89	–	1260	–	–	–	–
Tadross	2014	2.15	1.89	–	1260	–	–	–	–
Morales et al.	2013	2.15	–	–	1260	–	–	–	–
Dias et al.	2002	2.15	1.89	–	1259	–	–	–	–

Visualization

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