NGC 3766

(MWSC 1958; FoF 240)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 762
Core radius and density 1.6 [pc], 20 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 3766 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

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

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0775, e_all=0.0378.

Ahumada & Lapasset (2007)
Adopted cluster centre: star 20 (1965MNRAS.129..237S). In (1982A&A...109...37M) star 2 = HD 100856 (sp. B1.5III) is cited as a blue straggler.

Data
🔍 Search references for NGC 3766 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 174.059 -61.613 0.479 -6.734 0.983 -18.962
Li et al. 2025 174.061 -61.616 0.459 -6.731 0.961 –
Wei et al. 2025 174.075 -61.6 0.475 -6.716 0.985 –
Almeida et al. 2025 174.06 -61.614 – – – –
Hunt & Reffert 2024 174.071 -61.606 0.478 -6.733 0.985 -22.499
Celli et al. 2024 174.061 -61.616 – – – –
Cavallo et al. 2024 174.069 -61.613 0.479 – – –
Hunt & Reffert 2023 174.071 -61.606 0.478 -6.733 0.985 -22.499
Angelo et al. 2023 174.062 -61.617 – -6.72 0.99 –
Just et al. 2023 174.068 -61.611 – – – –
Jaehnig et al. 2021 174.06 -61.621 0.49 -6.734 0.958 –
Rain et al. 2021 174.061 -61.616 0.459 -6.731 0.961 –
Dias et al. 2021 174.06 -61.614 0.459 -6.736 0.964 -16.489
Cantat-Gaudin et al. 2020 174.061 -61.616 0.459 -6.731 0.961 –
Cantat-Gaudin & Anders 2020 174.061 -61.616 0.459 -6.731 0.961 –
Liu & Pang 2019 174.067 -61.598 0.461 -6.728 0.98 –
Dias et al. 2019 174.058 -61.608 0.46 -6.733 1.01 -16.489
Soubiran et al. 2018 174.061 -61.616 – – – -17.35
Cantat-Gaudin et al. 2018 174.061 -61.616 0.459 -6.731 0.961 –
Dias et al. 2018 – – – -6.67 0.53 –
Dib et al. 2018 174.075 -61.615 – – – –
Loktin & Popova 2017 174.06 -61.608 – -7.21 1.33 -14.8
Sampedro et al. 2017 174.058 -61.608 – -4.54 -4.24 –
Joshi et al. 2016 174.075 -61.615 – – – –
Kharchenko et al. 2016 174.068 -61.611 – – – –
Dias et al. 2014 174.058 -61.608 – -4.97 -3.44 –
Kharchenko et al. 2013 174.075 -61.615 – -6.0 -0.1 -14.8
Gozha et al. 2012 174.058 -61.608 – – – –
Piskunov et al. 2008 174.045 -61.606 – – – –
Piskunov et al. 2007 174.045 -61.606 – – – –
Ahumada & Lapasset 2007 174.05 -61.617 – – – –
van den Bergh 2006 174.055 -61.615 – – – –
Kharchenko et al. 2005 174.06 -61.61 – -6.72 1.35 -14.8
Kharchenko et al. 2003 174.01 -61.62 – -5.84 0.34 –
Chen et al. 2003 174.043 -61.574 – -7.21 1.33 -19.0
Dias et al. 2002 174.058 -61.608 – -7.21 1.33 -16.66
Dambis 1999 174.055 -61.615 – – – –
Lynga 1987 174.045 -61.606 – – – -19.0
van den Bergh & Hagen 1975 173.45 -61.333 – – – –
Sulentic et al. 1973 174.043 -61.605 – – – –

💡 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– 1.8 0.63 0.9 31 -0.051 1122 0.58 0
Li et al. 2025 1.80 0.72 – 30 -0.051 – – –
Wei et al. 2025 2.44 1.07 – 45 -0.250 5978 0.58 –
Almeida et al. 2025 1.86 0.80 – 31 – 2385 – –
Hunt & Reffert 2024 1.95 0.61 0.90 42 – 3522(1) – –
Celli et al. 2024 – – – 23 – 2428 – –
Cavallo et al. 2024 1.85 0.68 – 47 0.050 – – –
Hunt & Reffert 2023 1.95 0.61 0.90 42 – – – –
Angelo et al. 2023 1.66 0.82 – 35 0.100 6(1) – –
Just et al. 2023 – – – 89 – 526 – –
Jaehnig et al. 2021 2.04(1) – – – – – – –
Rain et al. 2021 2.05 0.63 – 21 – – – 0
Dias et al. 2021 1.86 0.80 – 31 0.051 – – –
Cantat-Gaudin et al. 2020 2.13 0.66 – 23 – – – –
Kounkel et al. 2020 1.87 0.72 – 44 – – – –
Cantat-Gaudin & Anders 2020 2.05 – – – – – – –
Liu & Pang 2019 – – – 30 0.000 – – –
Dias et al. 2019 1.80 0.73 – 25 -0.228 – – –
Soubiran et al. 2018 2.05 – – – – – – –
Cantat-Gaudin et al. 2018 2.05 – – – – – – –
Dib et al. 2018 1.69 – – 89 – – – –
Loktin & Popova 2017 1.75 0.55 – 14 – – – –
Joshi et al. 2016 1.69 0.66 – 89 – 1122 – –
Kharchenko et al. 2016 1.69 0.66 – 89 – – – –
Kharchenko et al. 2013 1.69 0.66 – 89 – – – –
Gozha et al. 2012 2.22 – – 21 -0.470 1122 – –
Paunzen et al. 2010 – – – – -0.470 – – –
Piskunov et al. 2008 1.75 0.57 – 33 – 535(1) – –
Piskunov et al. 2007 1.75 0.57 – 33 – 141 – –
Ahumada & Lapasset 2007 – 0.57 – 14 – – – 1
van den Bergh 2006 1.75 0.57 – 14 – – – –
Kharchenko et al. 2005 1.75 0.57 – 33 – – – –
Kharchenko et al. 2003 1.75 0.57 – – – – – –
Chen et al. 2003 1.75 – – 10 – – – –
Dias et al. 2002 2.22 0.63 – 21 – – – –
Dambis 1999 1.70 0.62 – 25 – – – –
Lynga 1987 1.70 0.54 – 22 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 13588 0.3 174.31 -61.21 0.48 -6.45 0.97 – 0.12

💡 Note: The % column shows the percentage of members that NGC 3766 shares with each listed object.

Visualization
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NGC 3766 UCC
NGC 3766 HUNT23
NGC 3766 CANTAT20
Galactocentric position diagram