ESO 166 04

(MWSC 1633)

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0.88 UTI
0.64
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 79
Radius (P>50% members) 4.6 [arcmin]
  • CN 0.64 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
ESO 166 04 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.
Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for ESO 166 04 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 137.617 -53.885 0.884 -5.922 5.744 17.73
Li et al. 2025 137.602 -53.884 0.866 -5.983 5.675 –
Almeida et al. 2025 137.602 -53.887 – – – –
Hunt & Reffert 2024 137.621 -53.886 0.888 -5.9 5.736 15.564
Cavallo et al. 2024 137.597 -53.87 0.886 – – –
Hunt & Reffert 2023 137.621 -53.886 0.888 -5.9 5.736 15.564
Almeida et al. 2023 137.607 -53.889 – – – –
Just et al. 2023 137.62 -53.887 – – – –
He et al. 2022 137.607 -53.874 0.884 -5.918 5.739 –
Tarricq et al. 2022 137.584 -53.898 0.881 -5.922 5.744 –
Dias et al. 2021 137.602 -53.887 0.868 -5.977 5.648 –
Cantat-Gaudin et al. 2020 137.602 -53.884 0.866 -5.983 5.675 –
Cantat-Gaudin & Anders 2020 137.602 -53.884 0.866 -5.983 5.675 –
Bossini et al. 2019 137.602 -53.884 – – – –
Soubiran et al. 2018 137.602 -53.884 – – – 16.76
Bica et al. 2019 137.619 -53.88 – – – –
Cantat-Gaudin et al. 2018 137.602 -53.884 0.866 -5.983 5.675 –
Kharchenko et al. 2016 137.62 -53.887 – – – –
Dias et al. 2014 137.625 -53.887 – -4.33 3.06 –
Kharchenko et al. 2013 137.625 -53.89 – -6.74 8.23 –
Piskunov et al. 2008 137.63 -53.888 – – – –
Kharchenko et al. 2005 137.62 -53.89 – -7.14 7.91 –

💡 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] Bfr BSS
Li et al. 2025 0.96 0.58 – 253 -0.267 – – –
Almeida et al. 2025 1.09 0.70 – 201 – 99 – –
Hunt & Reffert 2024 – – – – – 200* – –
Cavallo et al. 2024 1.11 0.68 – 182 0.070 – – –
Hunt & Reffert 2023 1.08 0.35 0.52 236 – – – –
Almeida et al. 2023 1.07 0.69 – 188 -0.120 107* 0.69 –
Just et al. 2023 – – – 182 – 20 – –
He et al. 2022 – 0.65 – 112 – – – –
Tarricq et al. 2022 1.06 – – 209 – – – –
Dias et al. 2021 1.09 0.70 – 201 0.045 – – –
Cantat-Gaudin et al. 2020 1.09 0.32 – 200 – – – –
Cantat-Gaudin & Anders 2020 1.12 – – – – – – –
Bossini et al. 2019 1.12 0.51 – 160 0.000 – – –
Soubiran et al. 2018 1.12 – – – – – – –
Cantat-Gaudin et al. 2018 1.12 – – – – – – –
Kharchenko et al. 2016 0.98 0.46 – 182 – – – –
Kharchenko et al. 2013 0.98 0.46 – 182 – – – –
Piskunov et al. 2008 0.89 0.46 – 282 – – – –
Kharchenko et al. 2005 0.89 0.46 – 282 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization
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ESO 166 04 UCC
ESO 166 04 HUNT23
ESO 166 04 CANTAT20
Galactocentric position diagram