Dias 2

(MWSC 756)

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0.63 UTI
0.71
CN
0.32
Cdens
0.62
CC3
0.74
Clit
1.0
Cdup
Nm (P>50%) 92
Core radius and density 2.2 [pc], 1.6 [pc-2]
C3 classification AC
  • CN 0.71 Moderately populated
  • Cdens 0.32 Loose
  • CC3 0.62 Intermediate quality
  • Clit 0.74 Moderately studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Dias 2 is a moderately populated, loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is moderately studied in the literature.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1664, e_all=0.0692.

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

Data
πŸ” Search references for Dias 2 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 92.282 4.571 0.212 -0.799 1.267 46.085
Li et al. 2025 92.291 4.573 0.21 -0.772 1.24 –
Hu & Soubiran 2025 92.284 4.573 – – – –
Almeida et al. 2025 92.294 4.585 – – – –
Hunt & Reffert 2024 92.289 4.571 0.224 -0.804 1.284 46.064
Cavallo et al. 2024 92.284 4.573 0.224 – – –
Hunt & Reffert 2023 92.289 4.571 0.224 -0.804 1.284 46.064
Just et al. 2023 92.273 4.586 – – – –
Jadhav & Subramaniam 2021 92.291 4.573 – – – –
Dias et al. 2021 92.294 4.585 0.226 -0.75 1.223 –
Cantat-Gaudin et al. 2020 92.291 4.573 0.21 -0.772 1.24 –
SΓ‘nchez et al. 2020 92.296 4.593 – -0.793 1.184 –
Zhong et al. 2020 92.291 4.573 – -0.772 1.24 45.889
Cantat-Gaudin & Anders 2020 92.291 4.573 0.21 -0.772 1.24 –
Bica et al. 2019 92.294 4.588 – – – –
Cantat-Gaudin et al. 2018 92.291 4.573 0.21 -0.772 1.24 –
Dias et al. 2018 – – – -0.08 -0.34 –
Loktin & Popova 2017 92.295 4.594 – -0.411 -0.263 –
Sampedro et al. 2017 92.296 4.593 – -0.81 -4.38 –
Kharchenko et al. 2016 92.273 4.586 – – – –
Tadross 2014 92.287 4.59 – – – –
Dias et al. 2014 92.296 4.593 – -0.68 -4.25 –
Kharchenko et al. 2013 92.28 4.585 – -0.87 0.7 –
Bukowiecki et al. 2011 92.287 4.572 – – – –
Dias et al. 2002 92.296 4.593 – -0.68 -4.25 –

πŸ’‘ 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] Bfrac BSS
UCC 99999– 4.03 1.03 0.9 1362 -0.242 468 – 0
Li et al. 2025 5.23 1.04 – 942 0.052 – – –
Hu & Soubiran 2025 – – – – -0.310(5) – – –
Almeida et al. 2025 4.03 1.03 – 1279 – 391 – –
Hunt & Reffert 2024 4.35 0.34 0.90 1631 – 333(1) – –
Cavallo et al. 2024 3.63 1.72 – 575 -0.990 – – –
Hunt & Reffert 2023 4.35 0.34 0.90 1633 – – – –
Just et al. 2023 – – – 1862 – 1119 – –
Jadhav & Subramaniam 2021 4.02 0.47 – 1738 – 546 – 0(1)
Dias et al. 2021 4.03 1.03 – 1279 -0.242 – – –
Cantat-Gaudin et al. 2020 4.02 0.47 – 1738 – – – –
Kounkel et al. 2020 4.19 0.94 – 1445 – – – –
Zhong et al. 2020 4.19(1) – – – 0.000 – – –
Cantat-Gaudin & Anders 2020 4.19 – – – – – – –
Cantat-Gaudin et al. 2018 4.19 – – – – – – –
Loktin & Popova 2017 3.66 0.71 – 251 – – – –
Kharchenko et al. 2016 2.97 1.31 – 1862 – – – –
Tadross 2014 2.83 1.92 – 790 – – – –
Kharchenko et al. 2013 2.97 1.31 – 1862 – – – –
Bukowiecki et al. 2011 4.80(1) 0.69 – 1122 – – – –
Dias et al. 2002 2.83 1.92 – 794 – – – –

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

Visualization
ℹ️
Dias 2 UCC
Dias 2 HUNT23
Dias 2 CANTAT20
Galactocentric position diagram