NGC 6997

(FoF 2227)

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0.90 UTI
1.0
CN
1.0
Cdens
0.75
CC3
0.86
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 601
Radius (P>50% members) 11.2 [arcmin]
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.86 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 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.

Close Moderate extinction Near-solar metallicity Intermediate age

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 – 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 –
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] Bfr BSS
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* 0.60 –
He et al. 2022 – 2.20 – 447 – – – –
Tarricq et al. 2022 0.88 – – 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 – – – –

(*): Indicates that this parameter is assigned more than one value 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 0.77

💡 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