NGC 7039

(Collinder 431; MWSC 3474; OCL 203)

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0.91 UTI
0.81
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 247
Stellar density (N50/rad) 70.5 [N/pc2]
C3 classification AB
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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
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NGC 7039 is a rich, very dense object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption and age parameters (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 294 along with OC_0140.

Palma et al. (2025)
Part of multiple system G220, along with OC_0140 and Theia_26.

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

Cavallo et al. (2024)
Gold sample.

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

Ahumada & Lapasset (2007)
According to (1987A&AS...67..545S) there would be two clusters: the first one at 700 pc, and the second one at 1500 pc.

Data
🔍 Search references for NGC 7039 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– 317.664 45.598 1.321 -0.26 -2.582 -7.62
Li et al. 2025 317.663 45.597 1.293 -0.32 -2.542 –
Wei et al. 2025 317.745 45.612 1.32 -0.225 -2.588 –
Almeida et al. 2025 317.662 45.595 – – – –
Alfonso et al. 2024 317.696 45.577 1.287 -0.239 -2.6 –
Swiggum et al. 2024 317.653 45.582 1.318 -0.24 -2.626 -9.628
Hunt & Reffert 2024 317.653 45.582 1.318 -0.24 -2.626 -7.442
Celli et al. 2024 317.663 45.597 – – – –
Cavallo et al. 2024 317.699 45.61 1.319 – – –
Hunt & Reffert 2023 317.653 45.582 1.318 -0.24 -2.626 -7.442
Almeida et al. 2023 317.655 45.586 – – – –
Just et al. 2023 317.757 45.73 – – – –
He et al. 2022 317.681 45.596 1.311 -0.254 -2.595 –
Rain et al. 2021 317.663 45.597 1.293 -0.32 -2.542 –
Richer et al. 2021 317.651 45.629 1.298 -0.342 -2.536 –
Dias et al. 2021 317.662 45.595 1.29 -0.249 -2.544 -8.512
Cantat-Gaudin et al. 2020 317.663 45.597 1.293 -0.32 -2.542 –
Cantat-Gaudin & Anders 2020 317.663 45.597 1.293 -0.32 -2.542 –
Soubiran et al. 2018 317.663 45.597 – – – -10.59
Bica et al. 2019 317.755 45.65 – – – –
Cantat-Gaudin et al. 2018 317.663 45.597 1.293 -0.32 -2.542 –
Loktin & Popova 2017 317.7 45.617 – -1.316 -0.227 -11.6
Kharchenko et al. 2016 317.757 45.73 – – – –
Dias et al. 2014 317.7 45.617 – -2.43 -2.21 –
Kharchenko et al. 2013 317.763 45.733 – -3.29 -0.48 -11.6
Gozha et al. 2012 317.7 45.617 – – – –
Bukowiecki et al. 2011 317.683 45.599 – – – –
Piskunov et al. 2008 317.695 45.621 – – – –
Kharchenko et al. 2007 317.7 45.62 – 0.28 – -11.6
Ahumada & Lapasset 2007 317.7 45.617 – – – –
van den Bergh 2006 317.7 45.617 – – – –
Kharchenko et al. 2005 317.7 45.62 – -1.68 -4.69 -11.0
Kharchenko et al. 2003 317.8 45.67 – -1.87 -5.14 –
Dias et al. 2002 317.7 45.617 – -0.48 -2.99 -12.2
Lynga 1987 317.805 45.659 – – – –
Sulentic et al. 1973 318.05 45.653 – – – –

💡 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– 0.78 0.41 1.09 44 -0.015 314 0.55 0
Liu et al. 2025 0.81 0.15 – 15 – – – –
Li et al. 2025 0.68 0.38 – 13 -0.052 – – –
Wei et al. 2025 0.80 1.02 – 6 0.000 815 0.70 –
Almeida et al. 2025 0.76 0.56 – 16 – 314 – –
Alfonso et al. 2024 0.76 0.28 – 18 0.091 – – –
Swiggum et al. 2024 0.74 – – 7 – 266 – –
Hunt & Reffert 2024 – – – – – 183(1) – –
Celli et al. 2024 – – – 22 – 215 – –
Cavallo et al. 2024 0.78 0.98 – 5 -0.070 – – –
Hunt & Reffert 2023 0.73 0.26 1.09 7 – – – –
Almeida et al. 2023 0.74 0.52 – 13 -0.031 218(1) 0.40 –
Just et al. 2023 – – – 452 – 793 – –
He et al. 2022 – 0.10 – 8 – – – –
Rain et al. 2021 0.76 0.41 – 66 – – – 0
Richer et al. 2021 – 0.82 – 12 – – – –
Dias et al. 2021 0.76 0.56 – 16 0.091 – – –
Cantat-Gaudin et al. 2020 0.76 0.28 – 22 – – – –
Kounkel et al. 2020 0.80 0.85 – 93 – – – –
Cantat-Gaudin & Anders 2020 0.76 – – – – – – –
Soubiran et al. 2018 0.76 – – – – – – –
Cantat-Gaudin et al. 2018 0.76 – – – – – – –
Loktin & Popova 2017 0.96 0.40 – 70 – – – –
Kharchenko et al. 2016 1.55 0.70 – 452 – – – –
Kharchenko et al. 2013 1.55 0.70 – 452 – – – –
Bukowiecki et al. 2012 – – – – – 420 – –
Gozha et al. 2012 0.95 – – 66 – 589 – –
Bukowiecki et al. 2011 0.82(1) 0.19 – 79 – – – –
Piskunov et al. 2008 0.95 0.41 – 676 – – – –
Ahumada & Lapasset 2007 – 0.41 – 66 – – – 0
van den Bergh 2006 0.95 0.41 – 66 – – – –
Kharchenko et al. 2005 0.95 0.41 – 676 – – – –
Kharchenko et al. 2003 0.95 0.41 – – – – – –
Dias et al. 2002 0.95 0.41 – 66 – – – –
Lynga 1987 0.70 0.38 – 126 – – – –

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

Visualization
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NGC 7039 UCC
NGC 7039 HUNT23
NGC 7039 CANTAT20
Galactocentric position diagram