Haffner 18

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0.74 UTI
0.76
CN
0.71
Cdens
1.0
CC3
0.61
Clit
1.0
Cdup
Nm (P>50%) 138
Core radius and density 1.7 [pc], 3.6 [pc-2]
C3 classification AA
  • CN 0.76 Rich
  • Cdens 0.71 Moderately dense
  • CC3 1.0 Very 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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Haffner 18 is a rich, moderately dense object of very high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a very young cluster (see Parameters). It is moderately studied in the literature.

Note: This object shares a moderate percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.74 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.74 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3247, e_all=0.3485.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg43' along with Haffner 19.

Data
🔍 Search references for Haffner 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– 118.179 -26.379 0.2 -2.533 2.625 103.523
Hunt & Reffert 2024 118.165 -26.383 0.191 -2.52 2.707 –
Celli et al. 2024 118.168 -26.387 – – – –
Hunt & Reffert 2023 118.165 -26.383 0.191 -2.52 2.707 –
Jaehnig et al. 2021 118.183 -26.377 0.192 -2.552 2.586 –
Rain et al. 2021 118.168 -26.387 0.185 -2.548 2.67 –
Cantat-Gaudin et al. 2020 118.168 -26.387 0.185 -2.548 2.67 –
Cantat-Gaudin & Anders 2020 118.168 -26.387 0.185 -2.548 2.67 –
Soubiran et al. 2018 118.168 -26.387 – – – 92.28
Cantat-Gaudin et al. 2018 118.168 -26.387 0.185 -2.548 2.67 –
Dias et al. 2018 – – – -2.18 2.96 –
Loktin & Popova 2017 118.17 -26.382 – -3.472 0.961 60.0
Sampedro et al. 2017 118.162 -26.383 – -4.78 2.66 –
Dias et al. 2014 118.162 -26.383 – -3.98 2.73 –
Bukowiecki et al. 2011 118.167 -26.389 – – – –
Ahumada & Lapasset 2007 118.175 -26.383 – – – –
van den Bergh 2006 118.125 -26.367 – – – –
Dias et al. 2002 118.162 -26.383 – -3.98 2.73 –
Dambis 1999 118.125 -26.367 – – – –
Lynga 1987 118.132 -26.351 – – – –

💡 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– 5.08 1.92 1.62 8 – 702 – 0
Hunt & Reffert 2024 6.82 2.42 1.62 4 – 298(1) – –
Celli et al. 2024 – – – 14 – 702 – –
Hunt & Reffert 2023 6.82 2.42 1.62 4 – – – –
Jaehnig et al. 2021 5.08(1) – – – – – – –
Rain et al. 2021 4.67 1.92 – 8 – – – 0
Cantat-Gaudin et al. 2020 5.08 1.52 – 14 – – – –
Kounkel et al. 2020 4.24 1.89 – 32 – – – –
Cantat-Gaudin & Anders 2020 4.67 – – – – – – –
Soubiran et al. 2018 4.67 – – – – – – –
Cantat-Gaudin et al. 2018 4.67 – – – – – – –
Loktin & Popova 2017 5.51 1.82 – 11 – – – –
Bukowiecki et al. 2012 – – – – – 1448 – –
Bukowiecki et al. 2011 6.23(1) 2.11 – 13 – – – –
Ahumada & Lapasset 2007 – 1.92 – 8 – – – 0
van den Bergh 2006 6.03 1.92 – 8 – – – –
Dias et al. 2002 6.03 1.93 – 8 – – – –
Dambis 1999 4.57 1.30 – 16 – – – –
Lynga 1987 6.90 – – 1 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
NGC 2467-East 65.2 118.18 -26.38 0.2 -2.53 2.69 – 0.02
Haffner 19 50.0 118.19 -26.28 0.2 -2.53 2.52 111.14 0.81

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

Visualization
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Haffner 18 UCC
Haffner 18 HUNT23
Haffner 18 CANTAT20
Galactocentric position diagram