ESO 092 18

(MWSC 1781)

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0.64 UTI
0.83
CN
0.42
Cdens
0.75
CC3
0.61
Clit
1.0
Cdup
Nm (P>50%) 310
Core radius and density 3.9 [pc], 2.1 [pc-2]
C3 classification AB
  • CN 0.83 Rich
  • Cdens 0.42 Loose
  • CC3 0.75 High quality
  • Clit 0.61 Moderately 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 092 18 is a rich, loose object of high C3 quality. Its parallax locates it at a very large* distance, well below the mid-plane, affected by low extinction. It is catalogued as a very massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is moderately studied in the literature.

(*): The parallax distance estimate (~18.73 kpc) differs significantly from the median photometric distance (~10.61 kpc).

Note: This object contains blue stragglers according to at least one source.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.05 (50th percentile).

Perren et al. (2022)
Kubiak 1991 estimated ~10 kpc and 8 Gyr; Carraro 1995 gives 8.1 kpc and 5 Gyr. The CMD shows a robust 2-magnitude main sequence with the TO at G=18.5, a well-defined RGB and RC, and BSS candidates in the range 15

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1819, e_all=0.1297.

Data
🔍 Search references for ESO 092 18 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– 153.735 -64.614 0.053 -3.549 2.74 55.454
Hu & Soubiran 2025 153.732 -64.609 – – – –
Hunt & Reffert 2024 153.735 -64.613 0.054 -3.513 2.737 52.165
Cavallo et al. 2024 153.732 -64.609 0.063 – – –
Hunt & Reffert 2023 153.735 -64.613 0.054 -3.513 2.737 52.165
Just et al. 2023 153.692 -64.586 – – – –
Perren et al. 2022 153.73 -64.611 – – – –
Jadhav & Subramaniam 2021 153.73 -64.611 – – – –
Cantat-Gaudin et al. 2020 153.73 -64.611 0.032 -3.551 2.761 –
Cantat-Gaudin & Anders 2020 153.73 -64.611 0.032 -3.551 2.761 –
Bica et al. 2019 153.733 -64.603 – – – –
Cantat-Gaudin et al. 2018 153.73 -64.611 0.032 -3.551 2.761 –
Dias et al. 2018 – – – -5.61 3.72 –
Loktin & Popova 2017 153.735 -64.612 – -7.758 -2.085 –
Sampedro et al. 2017 153.742 -64.612 – -5.66 3.24 –
Kharchenko et al. 2016 153.692 -64.586 – – – –
Dias et al. 2014 153.742 -64.612 – -5.41 3.93 –
Kharchenko et al. 2013 153.697 -64.59 – -6.21 2.95 –
Bukowiecki et al. 2011 153.729 -64.602 – – – –
van den Bergh 2006 153.725 -64.617 – – – –
Dias et al. 2002 153.742 -64.612 – -5.41 3.93 –

💡 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– 10.61 0.98 1.54 1413 -0.320 5692 0.6 3
Hu & Soubiran 2025 – – – – -0.350(5) – – –
Hunt & Reffert 2024 13.08 1.51 1.54 565 – 1055(1) – –
Cavallo et al. 2024 7.80 0.65 – 9550 -0.320 – – –
Hunt & Reffert 2023 13.08 1.51 1.54 565 – – – –
Just et al. 2023 – – – 1413 – 5188 – –
Perren et al. 2022 11.22 0.76 – 4786 -0.300 52000 0.60 –
Jadhav & Subramaniam 2021 9.91 0.47 – 2884 – 6195 – 3(1)
Cantat-Gaudin et al. 2020 9.91 0.47 – 2884 – – – –
Kounkel et al. 2020 8.35 0.91 – 2042 – – – –
Cantat-Gaudin & Anders 2020 16.35 – – – – – – –
Cantat-Gaudin et al. 2018 16.35 – – – – – – –
Loktin & Popova 2017 9.29 1.56 – 1074 – – – –
Kharchenko et al. 2016 9.55 0.98 – 1413 – – – –
Kharchenko et al. 2013 9.55 0.98 – 1413 – – – –
Bukowiecki et al. 2011 13.29(1) 0.13 – 1259 – – – –
van den Bergh 2006 10.61 1.58 – 1047 – – – –
Dias et al. 2002 10.61 1.58 – 1057 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
HSC 2365 9.4 153.73 -64.61 0.07 -3.53 2.74 57.31 0.0

💡 Note: The % column shows the percentage of members that ESO 092 18 shares with each listed object.

Visualization
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ESO 092 18 UCC
ESO 092 18 HUNT23
ESO 092 18 CANTAT20
Galactocentric position diagram