NGC 6756

(Collinder 398; MWSC 3052; OCL 99; FSR 0113)

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0.91 UTI
0.87
CN
1.0
Cdens
1.0
CC3
0.83
Clit
1.0
Cdup
N50 (P>50% members) 424
Stellar density (N50/rad) 145.8 [N/pc2]
C3 classification AA
  • CN 0.87 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.83 Well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
NGC 6756 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, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg25' along with Czernik 39 and NGC 6755.

Data
πŸ” Search references for NGC 6756 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 287.181 4.71 0.307 -1.55 -3.662 48.759
Otto et al. 2026 287.181 4.711 – -1.58 -3.63 47.1
Li et al. 2025 287.181 4.711 0.281 -1.584 -3.631 –
Almeida et al. 2025 287.184 4.711 – – – –
Hunt & Reffert 2024 287.181 4.711 0.312 -1.546 -3.665 55.282
Cavallo et al. 2024 287.182 4.709 0.308 – – –
Hunt & Reffert 2023 287.181 4.711 0.312 -1.546 -3.665 55.282
Just et al. 2023 287.18 4.715 – – – –
Dias et al. 2021 287.184 4.711 0.283 -1.586 -3.628 –
Cantat-Gaudin et al. 2020 287.181 4.711 0.281 -1.584 -3.631 –
SΓ‘nchez et al. 2020 287.175 4.705 – -1.712 -3.695 –
Cantat-Gaudin & Anders 2020 287.181 4.711 0.281 -1.584 -3.631 –
Bica et al. 2019 287.166 4.712 – – – –
Cantat-Gaudin et al. 2018 287.181 4.711 0.281 -1.584 -3.631 –
Loktin & Popova 2017 287.19 4.717 – -5.33 -3.399 –
Kharchenko et al. 2016 287.18 4.715 – – – –
Dias et al. 2014 287.175 4.705 – -1.03 -3.43 –
Kharchenko et al. 2013 287.187 4.717 – -4.68 -4.35 –
Bukowiecki et al. 2011 287.183 4.715 – – – –
van den Bergh 2006 287.175 4.683 – – – –
Dias et al. 2002 287.175 4.705 – -1.03 -3.43 –
Lynga 1987 287.17 4.676 – – – –
Sulentic et al. 1973 287.16 4.657 – – – –

πŸ’‘ 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– 2.81 3.345 2.04 70 0.100 1978 – –
Otto et al. 2026 – – – 48 -0.060(15) – – –
Li et al. 2025 1.22 1.87 – 2667 0.049 – – –
Almeida et al. 2025 2.81 3.15 – 27 – 2380 – –
Hunt & Reffert 2024 – – – – – 4519(1) – –
Cavallo et al. 2024 3.09 3.41 – 162 0.610 – – –
Hunt & Reffert 2023 2.89 3.55 2.04 47 – – – –
Just et al. 2023 – – – 251 – 219 – –
Dias et al. 2021 2.81 3.15 – 27 0.324 – – –
Cantat-Gaudin et al. 2020 3.16 3.17 – 48 – – – –
Kounkel et al. 2020 2.97 3.28 – 288 – – – –
Cantat-Gaudin & Anders 2020 3.22 – – – – – – –
Cantat-Gaudin et al. 2018 3.22 – – – – – – –
Loktin & Popova 2017 3.21 2.39 – 646 – – – –
Kharchenko et al. 2016 1.95 3.42 – 251 – – – –
Kharchenko et al. 2013 1.95 3.42 – 251 – – – –
Bukowiecki et al. 2012 – – – – – 1575 – –
Bukowiecki et al. 2011 1.86(1) 2.93 – 79 – – – –
van den Bergh 2006 1.51 3.72 – 62 – – – –
Dias et al. 2002 1.51 3.72 – 62 0.100 – – –
Lynga 1987 1.65 4.48 – 47 – – – –

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

Visualization
ℹ️
NGC 6756 UCC
NGC 6756 HUNT23
NGC 6756 CANTAT20
Galactocentric position diagram