SAI 4

(MWSC 37)

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0.65 UTI
0.7
CN
0.37
Cdens
0.75
CC3
0.71
Clit
1.0
Cdup
Nm (P>50%) 90
Core radius and density 2.1 [pc], 1.9 [pc-2]
C3 classification AB
  • CN 0.7 Moderately populated
  • Cdens 0.37 Loose
  • CC3 0.75 High quality
  • Clit 0.71 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
SAI 4 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2631, e_all=0.0666.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg56' along with Stock 20.

Data
πŸ” Search references for SAI 4 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 5.883 62.711 0.307 -3.091 -0.599 -47.351
Almeida et al. 2025 5.892 62.711 – – – –
Hunt & Reffert 2024 5.905 62.708 0.308 -3.098 -0.624 -47.443
Cavallo et al. 2024 5.946 62.743 0.308 – – –
Hunt & Reffert 2023 5.905 62.708 0.308 -3.098 -0.624 -47.443
Almeida et al. 2023 5.902 62.708 – – – –
Just et al. 2023 5.898 62.706 – – – –
Dias et al. 2021 5.892 62.711 0.318 -3.099 -0.516 –
Cantat-Gaudin et al. 2020 5.895 62.712 0.314 -3.095 -0.551 –
SΓ‘nchez et al. 2020 5.917 62.704 – -2.492 -0.608 –
Cantat-Gaudin & Anders 2020 5.895 62.712 0.314 -3.095 -0.551 –
Soubiran et al. 2018 5.895 62.712 – – – -69.27
Bica et al. 2019 5.908 62.7 – – – –
Cantat-Gaudin et al. 2018 5.895 62.712 0.314 -3.095 -0.551 –
Dib et al. 2018 5.907 62.71 – – – –
Loktin & Popova 2017 5.91 62.704 – -5.288 -4.478 -100.7
Sampedro et al. 2017 5.917 62.704 – -3.08 4.0 –
Joshi et al. 2016 5.907 62.71 – – – –
Kharchenko et al. 2016 5.898 62.706 – – – –
Dias et al. 2014 5.917 62.704 – -1.8 3.0 –
Kharchenko et al. 2013 5.907 62.71 – -4.53 -3.83 -100.7
Kharchenko et al. 2012 5.907 62.71 – -4.53 -3.83 -100.7
Glushkova et al. 2010 5.917 62.704 – – – –
Dias et al. 2002 5.917 62.704 – -1.8 3.0 -100.7

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– 2.5 1.52 1.68 501 -0.115 340 0.65 –
Almeida et al. 2025 2.50 1.77 – 43 – 313 – –
Hunt & Reffert 2024 2.85 1.63 1.68 150 – 479(1) – –
Cavallo et al. 2024 2.58 1.73 – 200 -0.120 – – –
Hunt & Reffert 2023 2.85 1.63 1.68 150 – – – –
Almeida et al. 2023 2.55 1.83 – 34 -0.115 368(1) 0.65 –
Just et al. 2023 – – – 631 – 5 – –
Dias et al. 2021 2.50 1.77 – 43 -0.071 – – –
Cantat-Gaudin et al. 2020 3.22 1.52 – 105 – – – –
Kounkel et al. 2020 2.96 1.87 – 145 – – – –
Cantat-Gaudin & Anders 2020 2.91 – – – – – – –
Soubiran et al. 2018 2.91 – – – – – – –
Cantat-Gaudin et al. 2018 2.91 – – – – – – –
Dib et al. 2018 1.60 – – 631 – – – –
Loktin & Popova 2017 2.01 0.95 – 617 – – – –
Joshi et al. 2016 1.60 1.26 – 631 – – – –
Kharchenko et al. 2016 1.60 1.26 – 631 – – – –
Kharchenko et al. 2013 1.60 1.26 – 631 – – – –
Kharchenko et al. 2012 1.60 1.26 – 631 – – – –
Glushkova et al. 2010 1.60 0.85 – 501 – – – –
Dias et al. 2002 1.60 0.85 – 501 – – – –

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

Visualization
ℹ️
SAI 4 UCC
SAI 4 HUNT23
SAI 4 CANTAT20
Galactocentric position diagram