NGC 6997

(FoF 2227)

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0.89 UTI
1.0
CN
1.0
Cdens
0.75
CC3
0.84
Clit
1.0
Cdup
N50 (P>50% members) 601
Stellar density (N50/rad) 72.3 [N/pc2]
C3 classification AB
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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
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NGC 6997 is a very rich, very dense object of high C3 quality. Its parallax locates it at a close distance, near 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 metallicity parameter (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Richer et al. (2021)
The expected number of WDs is 42.6, 0 WD candidates found, and 0 WD candidates found in the wide search.

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

Data
🔍 Search references for NGC 6997 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– 314.159 44.631 1.13 -4.293 -6.927 -20.009
Li et al. 2025 314.128 44.64 1.127 -4.275 -6.882 –
Almeida et al. 2025 314.142 44.632 – – – –
Alfonso et al. 2024 314.161 44.624 1.101 -4.294 -6.924 –
Almeida et al. 2023 314.142 44.633 – – – –
He et al. 2022 314.154 44.619 1.131 -4.293 -6.925 –
Tarricq et al. 2022 314.137 44.608 1.134 -4.293 -6.918 –
Richer et al. 2021 314.134 44.625 1.131 -4.317 -6.848 –
Dias et al. 2021 314.142 44.632 1.128 -4.28 -6.849 -19.037
Cantat-Gaudin et al. 2020 314.128 44.64 1.127 -4.275 -6.882 –
Cantat-Gaudin & Anders 2020 314.128 44.64 1.127 -4.275 -6.882 –
Liu & Pang 2019 314.182 44.636 1.127 -4.302 -6.886 –
Bossini et al. 2019 314.128 44.64 – – – –
Soubiran et al. 2018 314.128 44.64 – – – -19.61
Cantat-Gaudin et al. 2018 314.128 44.64 1.127 -4.275 -6.882 –
Loktin & Popova 2017 314.13 44.65 – -1.982 -1.569 –
Dias et al. 2014 314.125 44.65 – -3.89 -6.45 –
Dias et al. 2002 314.125 44.65 – -3.89 -6.45 –

💡 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– 0.87 1.98 – 552 0.147 468 0.6 –
Li et al. 2025 0.76 1.98 – 519 -0.153 – – –
Almeida et al. 2025 0.86 1.99 – 542 – 400 – –
Alfonso et al. 2024 0.90 1.43 – 516 0.171 – – –
Almeida et al. 2023 0.86 2.04 – 428 0.124 535(1) 0.60 –
He et al. 2022 – 2.20 – 447 – – – –
Tarricq et al. 2022 0.88 – – 646 – – – –
Richer et al. 2021 – 1.93 – 646 – – – –
Dias et al. 2021 0.86 1.99 – 542 0.172 – – –
Cantat-Gaudin et al. 2020 0.90 1.43 – 646 – – – –
Cantat-Gaudin & Anders 2020 0.87 – – – – – – –
Liu & Pang 2019 – – – 576 0.500 – – –
Bossini et al. 2019 1.09 1.64 – 552 0.000 – – –
Soubiran et al. 2018 0.87 – – – – – – –
Cantat-Gaudin et al. 2018 0.87 – – – – – – –
Loktin & Popova 2017 1.53 1.50 – 708 – – – –
Dias et al. 2002 0.74 2.13 – 794 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
NGC 6996 87.2 314.15 44.62 1.13 -4.3 -6.93 -20.11 0.79

💡 Note: The % column shows the percentage of members that NGC 6997 shares with each listed object.

Visualization
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NGC 6997 UCC
NGC 6997 CANTAT20
Galactocentric position diagram