Haffner 15

(VDBH 8; MWSC 1328; OCL 696; vdBergh-Hagen 8; ESO 368 12; FSR 1340)

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0.91 UTI
0.86
CN
1.0
Cdens
1.0
CC3
0.84
Clit
1.0
Cdup
N50 (P>50% members) 392
Stellar density (N50/rad) 42.9 [N/pc2]
C3 classification AA
  • CN 0.86 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.84 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Haffner 15 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the distance, age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a moderate percentage of members with 3 later reported entries. See table with shared members information.

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 260 along with ESO_368-14.

Palma et al. (2025)
Part of multiple system G73, along with HSC_1999 and ESO_368-14.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.62 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.62 (50th percentile).

Data
🔍 Search references for Haffner 15 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– 116.376 -32.842 0.26 -2.172 3.317 76.836
Li et al. 2025 116.38 -32.846 0.238 -2.154 3.289 –
Almeida et al. 2025 116.381 -32.847 – – – –
Hunt & Reffert 2024 116.379 -32.84 0.258 -2.171 3.322 52.093
Celli et al. 2024 116.38 -32.846 – – – –
Cavallo et al. 2024 116.375 -32.846 0.262 – – –
Hunt & Reffert 2023 116.379 -32.84 0.258 -2.171 3.322 52.093
Just et al. 2023 116.377 -32.846 – – – –
Dias et al. 2021 116.381 -32.847 0.236 -2.151 3.276 –
Cantat-Gaudin et al. 2020 116.38 -32.846 0.238 -2.154 3.289 –
Cantat-Gaudin & Anders 2020 116.38 -32.846 0.238 -2.154 3.289 –
Dias et al. 2019 116.379 -32.846 0.238 -2.154 3.289 52.95
Bica et al. 2019 116.384 -32.836 – – – –
Cantat-Gaudin et al. 2018 116.38 -32.846 0.238 -2.154 3.289 –
Dias et al. 2018 – – – -3.1 2.91 –
Loktin & Popova 2017 116.385 -32.848 – 0.801 1.159 –
Sampedro et al. 2017 116.383 -32.85 2.91 5.06 – –
Kharchenko et al. 2016 116.377 -32.846 – – – –
Dias et al. 2014 116.383 -32.85 – 2.08 3.9 –
Kharchenko et al. 2013 116.382 -32.848 – -0.17 1.5 –
Bukowiecki et al. 2011 116.379 -32.826 – – – –
van den Bergh 2006 116.375 -32.842 – – – –
Dias et al. 2002 116.383 -32.85 – 2.08 3.9 –
Dambis 1999 116.375 -32.842 – – – –
Lynga 1987 116.328 -32.794 – – – –
van den Bergh & Hagen 1975 115.85 -32.667 – – – –

💡 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– 3.05 3.31 2.39 19 -0.022 1169 – –
Liu et al. 2025 15.00 1.22 – 11 – – – –
Li et al. 2025 1.58 2.12 – 1614 -0.225 – – –
Almeida et al. 2025 3.05 3.12 – 7 – 1000 – –
Hunt & Reffert 2024 – – – – – 3377(1) – –
Celli et al. 2024 – – – 26 – 1233 – –
Cavallo et al. 2024 4.57 3.34 – 19 0.730 – – –
Hunt & Reffert 2023 3.26 3.54 2.39 12 – – – –
Just et al. 2023 – – – 19 – 223 – –
Dias et al. 2021 3.05 3.12 – 7 -0.355 – – –
Cantat-Gaudin et al. 2020 3.82 3.13 – 26 – – – –
Kounkel et al. 2020 3.30 2.94 – 132 – – – –
Cantat-Gaudin & Anders 2020 3.74 – – – – – – –
Dias et al. 2019 4.69 2.56 – 14 0.180 – – –
Cantat-Gaudin et al. 2018 3.74 – – – – – – –
Loktin & Popova 2017 2.19 3.44 – 19 – – – –
Kharchenko et al. 2016 2.24 3.45 – 19 – – – –
Kharchenko et al. 2013 2.24 3.45 – 19 – – – –
Bukowiecki et al. 2012 – – – – – 1169 – –
Bukowiecki et al. 2011 2.46(1) 3.00 – 22 – – – –
van den Bergh 2006 2.08 3.60 – 15 – – – –
Dias et al. 2002 3.50 3.31 – 20 – – – –
Dambis 1999 2.84 3.51 – 63 – – – –
Lynga 1987 2.50 3.53 – 6 – – – –

(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 0434 28.8 116.38 -32.84 0.27 -2.17 3.33 65.46 0.0
OC 0435 8.4 116.38 -32.84 0.28 -2.16 3.31 -32.74 0.0
OC 0437 3.1 116.56 -32.86 0.29 -2.12 3.43 82.33 0.04

💡 Note: The % column shows the percentage of members that Haffner 15 shares with each listed object.

Visualization
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Haffner 15 UCC
Haffner 15 HUNT23
Haffner 15 CANTAT20
Galactocentric position diagram