NGC 6704

(Collinder 390; MWSC 3007; OCL 82)

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0.93 UTI
0.8
CN
1.0
Cdens
1.0
CC3
0.93
Clit
1.0
Cdup
Nm (P>50%) 232
Core radius and density 1.0 [pc], 19 [pc-2]
C3 classification AA
  • CN 0.8 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.93 Very 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 6704 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 moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0572, e_all=0.0254.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=8.237, Av=2.260, [Fe/H]=0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). The distance d=1775.0 (dmode+01) of Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93) was use to fit the isochrone.

Data
πŸ” Search references for NGC 6704 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 282.687 -5.198 0.424 -0.704 -3.176 26.116
Li et al. 2025 282.687 -5.203 0.434 -0.73 -3.139 –
Yang et al. 2025 282.688 -5.199 – – – –
Almeida et al. 2025 282.686 -5.2 – – – –
Hunt & Reffert 2024 282.688 -5.199 0.415 -0.706 -3.202 28.505
Cavallo et al. 2024 282.689 -5.194 0.415 – – –
Hunt & Reffert 2023 282.688 -5.199 0.415 -0.706 -3.202 28.505
Just et al. 2023 282.679 -5.212 – – – –
Dias et al. 2022 282.689 -5.2 0.419 -0.693 -3.203 –
Jaehnig et al. 2021 282.688 -5.206 0.462 -0.725 -3.146 –
Rain et al. 2021 282.687 -5.203 0.434 -0.73 -3.139 –
Dias et al. 2021 282.686 -5.2 0.439 -0.728 -3.14 –
Cantat-Gaudin et al. 2020 282.687 -5.203 0.434 -0.73 -3.139 –
SΓ‘nchez et al. 2020 282.688 -5.205 – -0.714 -3.009 –
Cantat-Gaudin & Anders 2020 282.687 -5.203 0.434 -0.73 -3.139 –
Bossini et al. 2019 282.687 -5.203 – – – –
Soubiran et al. 2018 282.687 -5.203 – – – 25.49
Bica et al. 2019 282.681 -5.2 – – – –
Cantat-Gaudin et al. 2018 282.687 -5.203 0.434 -0.73 -3.139 –
Dias et al. 2018 – – – 0.02 -2.15 –
Loktin & Popova 2017 282.675 -5.21 – 0.197 -6.858 –
Sampedro et al. 2017 282.688 -5.205 – -1.73 -2.61 –
Kharchenko et al. 2016 282.679 -5.212 – – – –
Dias et al. 2014 282.688 -5.205 – -1.69 -2.04 –
Kharchenko et al. 2013 282.687 -5.21 – -0.98 -2.67 –
Ahumada & Lapasset 2007 282.7 -5.2 – – – –
van den Bergh 2006 282.725 -5.2 – – – –
Dias et al. 2002 282.688 -5.205 – -1.69 -2.04 –
Lynga 1987 282.703 -5.201 – – – –
Sulentic et al. 1973 282.708 -5.203 – – – –

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– 2.16 2.45 1.46 119 0.157 730 – 0
Li et al. 2025 1.62 2.29 – 356 0.152 – – –
Yang et al. 2025 – – – 170 0.130(3) – – –
Almeida et al. 2025 1.76 2.45 – 121 – 730 – –
Hunt & Reffert 2024 2.16 2.68 1.46 169 – 2225(1) – –
Cavallo et al. 2024 2.39 2.83 – 117 0.660 – – –
Hunt & Reffert 2023 2.16 2.68 1.46 169 – – – –
Just et al. 2023 – – – 100 – 261 – –
Dias et al. 2022 2.01(1) 2.63(1) – 113(1) 0.162(1) – – –
Jaehnig et al. 2021 2.14(1) – – – – – – –
Rain et al. 2021 2.16 2.27 – 170 – – – 0
Dias et al. 2021 1.76 2.45 – 121 0.273 – – –
Cantat-Gaudin et al. 2020 2.04 2.23 – 200 – – – –
Kounkel et al. 2020 2.32 2.88 – 191 – – – –
Cantat-Gaudin & Anders 2020 2.16 – – – – – – –
Bossini et al. 2019 2.27 2.26 – 173 0.000 – – –
Soubiran et al. 2018 2.16 – – – – – – –
Cantat-Gaudin et al. 2018 2.16 – – – – – – –
Loktin & Popova 2017 2.96 2.26 – 74 – – – –
Kharchenko et al. 2016 2.18 3.02 – 100 – – – –
Kharchenko et al. 2013 2.18 3.02 – 100 – – – –
Ahumada & Lapasset 2007 – 2.27 – 72 – – – 0
van den Bergh 2006 2.97 2.27 – 72 – – – –
Dias et al. 2002 2.97 2.26 – 73 – – – –
Lynga 1987 1.81 3.22 – 20 – – – –

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

Visualization
ℹ️
NGC 6704 UCC
NGC 6704 HUNT23
NGC 6704 CANTAT20
Galactocentric position diagram