ESO 312 04

(MWSC 1491)

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0.65 UTI
0.58
CN
0.93
Cdens
0.75
CC3
0.48
Clit
1.0
Cdup
Nm (P>50%) 67
Core radius and density 1.4 [pc], 4.7 [pc-2]
C3 classification AB
  • CN 0.58 Moderately populated
  • Cdens 0.93 Very dense
  • CC3 0.75 High quality
  • Clit 0.48 Poorly studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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ESO 312 04 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a large distance, below 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 metallicity parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.13 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.13 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1572, e_all=0.0707.

Data
🔍 Search references for ESO 312 04 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– 126.722 -41.252 0.164 -2.909 3.862 86.924
Almeida et al. 2025 126.722 -41.247 – – – –
Hunt & Reffert 2024 126.721 -41.251 0.169 -2.927 3.825 –
Cavallo et al. 2024 126.753 -41.256 0.171 – – –
Hunt & Reffert 2023 126.721 -41.251 0.169 -2.927 3.825 –
Dias et al. 2021 126.722 -41.247 0.136 -2.911 3.907 –
Cantat-Gaudin et al. 2020 126.722 -41.251 0.15 -2.915 3.917 –
Cantat-Gaudin & Anders 2020 126.722 -41.251 0.15 -2.915 3.917 –
Bica et al. 2019 126.73 -41.247 – – – –
Cantat-Gaudin et al. 2018 126.722 -41.251 0.15 -2.915 3.917 –
Dib et al. 2018 126.693 -41.238 – – – –
Sampedro et al. 2017 126.713 -41.244 – -2.89 0.99 –
Dias et al. 2014 126.713 -41.244 – -2.41 1.04 –
Bukowiecki et al. 2011 126.713 -41.255 – – – –
Glushkova et al. 2010 126.713 -41.244 – – – –
Dias et al. 2002 126.713 -41.244 – -6.31 7.61 –

💡 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– 4.88 2.27 1.98 104 0.178 420 – –
Almeida et al. 2025 5.02 2.27 – 104 – 255 – –
Hunt & Reffert 2024 4.87 2.36 1.98 90 – 711(1) – –
Cavallo et al. 2024 4.88 2.37 – 105 0.480 – – –
Hunt & Reffert 2023 4.87 2.35 1.98 90 – – – –
Dias et al. 2021 5.02 2.27 – 104 -0.123 – – –
Cantat-Gaudin et al. 2020 5.86 2.06 – 45 – – – –
Kounkel et al. 2020 5.75 2.76 – 81 – – – –
Cantat-Gaudin & Anders 2020 5.60 – – – – – – –
Cantat-Gaudin et al. 2018 5.60 – – – – – – –
Dib et al. 2018 1.96 – – 200 – – – –
Bukowiecki et al. 2012 – – – – – 420 – –
Bukowiecki et al. 2011 2.14(1) 1.70 – 71 – – – –
Glushkova et al. 2010 2.41 1.55 – 562 – – – –
Dias et al. 2002 2.41 1.55 – 562 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0461 34.3 126.72 -41.25 0.19 -2.91 3.85 – 0.02

💡 Note: The % column shows the percentage of members that ESO 312 04 shares with each listed object.

Visualization
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ESO 312 04 UCC
ESO 312 04 HUNT23
ESO 312 04 CANTAT20
Galactocentric position diagram