Dias 128

0.06 UTI

0.0

C_N

0.06

C_dens

0.25

C_C3

0.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 19

Stellar density (N₅₀/rad) 0.3 [N/pc²]

C3 classification CC

C_N 0.0 Sparse
C_dens 0.06 Very loose
C_C3 0.25 Low quality
C_lit 0.0 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 128 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large^* distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very old cluster (see Parameters). It was recently reported in the literature.

(*): The parallax distance estimate (~5.20 kpc) differs significantly from the median photometric distance (~3.94 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.

Distant Low extinction Near-solar metallicity Very old

Data

🔍 Search references for Dias 128 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–	359.463	56.664	0.192	-1.756	-1.007	-92.232
Dias et al.	2026	359.471	56.699	0.199	-1.747	-1.012	-84.467

💡 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–	3.94	0.8	–	6053	-0.047	–	–	–
Dias et al.	2026	3.94	0.80	–	6053	-0.047	–	–	–

Visualization

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