NGC 6664

(Collinder 385; MWSC 2962; OCL 68; Alessi 153)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 522
Core radius and density 2.1 [pc], 8.0 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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
ℹī¸
NGC 6664 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate 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 very well-studied in the literature.

Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.

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: 0.90 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.90 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.213, e_all=0.0624.

Bica et al. (2019)
List of clusters and alike reported by B. Alessi.

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: one or a few submm emission within the cluster area.

Ahumada & Lapasset (2007)
The Stromgren photometry (1982AJ.....87.1197S) cites stars 53 and 61 as blue stragglers.

Data
🔍 Search references for NGC 6664 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– 279.121 -8.184 0.464 -0.075 -2.591 16.065
Li et al. 2025 279.125 -8.194 0.468 -0.089 -2.561 –
Almeida et al. 2025 279.125 -8.188 – – – –
Hunt & Reffert 2024 279.118 -8.206 0.455 -0.099 -2.593 17.343
Cavallo et al. 2024 279.119 -8.185 0.456 – – –
Hunt & Reffert 2023 279.118 -8.206 0.455 -0.099 -2.593 17.343
Just et al. 2023 279.125 -8.212 – – – –
Jaehnig et al. 2021 279.131 -8.199 0.509 -0.091 -2.552 –
Rain et al. 2021 279.125 -8.194 0.468 -0.089 -2.561 –
Dias et al. 2021 279.125 -8.188 0.473 -0.094 -2.55 2.007
Cantat-Gaudin et al. 2020 279.125 -8.194 0.468 -0.089 -2.561 –
Cantat-Gaudin & Anders 2020 279.125 -8.194 0.468 -0.089 -2.561 –
Dias et al. 2019 279.125 -8.194 0.468 -0.089 -2.561 -4.44
Soubiran et al. 2018 279.125 -8.194 – – – -4.44
Bica et al. 2019 279.14 -8.216 – – – –
Cantat-Gaudin et al. 2018 279.125 -8.194 0.468 -0.089 -2.561 –
Dias et al. 2018 – – – -0.49 -3.86 –
Dib et al. 2018 279.132 -8.21 – – – –
Loktin & Popova 2017 279.15 -7.814 – -2.729 -3.562 17.8
Sampedro et al. 2017 279.154 -7.813 – 0.63 3.6 –
Joshi et al. 2016 279.132 -8.21 – – – –
Kharchenko et al. 2016 279.125 -8.212 – – – –
Dias et al. 2014 279.154 -7.813 – 0.54 4.18 –
Kharchenko et al. 2013 279.132 -8.21 – -2.52 -2.0 17.8
Morales et al. 2013 279.154 -7.813 – – – –
Gozha et al. 2012 279.154 -7.813 – – – –
Bukowiecki et al. 2011 279.188 -7.843 – – – –
Kharchenko et al. 2007 279.15 -7.81 – 0.1 – –
Ahumada & Lapasset 2007 279.15 -7.817 – – – –
van den Bergh 2006 279.175 -8.217 – – – –
Kharchenko et al. 2003 279.18 -8.22 – 0.47 -1.02 –
Chen et al. 2003 279.209 -8.173 – -0.31 -2.31 17.8
Dias et al. 2002 279.154 -7.813 – -0.31 -2.31 18.58
Dambis 1999 279.154 -7.813 – – – –
Lynga 1987 279.186 -8.217 – – – 23.0
Sulentic et al. 1973 279.19 -8.228 – – – –

💡 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– 1.71 2.27 2.42 44 -0.299 1545 – 0
Li et al. 2025 1.55 1.73 – 652 0.150 – – –
Almeida et al. 2025 1.94 2.44 – 13 – 1545 – –
Hunt & Reffert 2024 1.96 2.54 2.42 69 – 3177(1) – –
Cavallo et al. 2024 1.76 2.95 – 50 -0.460 – – –
Hunt & Reffert 2023 1.96 2.54 2.42 69 – – – –
Just et al. 2023 – – – 79 – 147 – –
Jaehnig et al. 2021 1.95(1) – – – – – – –
Rain et al. 2021 2.01 2.21 – 14 – – – 0
Dias et al. 2021 1.94 2.44 – 13 -0.138 – – –
Cantat-Gaudin et al. 2020 2.11 1.94 – 224 – – – –
Kounkel et al. 2020 2.11 2.71 – 91 – – – –
Cantat-Gaudin & Anders 2020 2.01 – – – – – – –
Dias et al. 2019 1.90 2.21 – 24 -0.881 – – –
Soubiran et al. 2018 2.01 – – – – – – –
Cantat-Gaudin et al. 2018 2.01 – – – – – – –
Dib et al. 2018 1.71 – – 79 – – – –
Loktin & Popova 2017 1.18 2.23 – 16 – – – –
Joshi et al. 2016 1.71 2.33 – 79 – – – –
Kharchenko et al. 2016 1.71 2.33 – 79 – – – –
Kharchenko et al. 2013 1.71 2.33 – 79 – – – –
Morales et al. 2013 1.16 – – 14 – – – –
Gozha et al. 2012 1.16 – – 15 – – – –
Ahumada & Lapasset 2007 – 2.24 – 14 – – – 0
van den Bergh 2006 1.16 2.24 – 14 – – – –
Kharchenko et al. 2003 1.16 1.89 – – – – – –
Chen et al. 2003 1.16 – – 10 – – – –
Dias et al. 2002 1.16 2.24 – 15 – – – –
Dambis 1999 1.26 2.30 – 79 – – – –
Lynga 1987 1.37 1.92 – 37 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0042 4.8 279.15 -8.13 0.5 -0.1 -2.6 -8.18 0.0

💡 Note: The % column shows the percentage of members that NGC 6664 shares with each listed object.

Visualization
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NGC 6664 UCC
NGC 6664 HUNT23
NGC 6664 CANTAT20
Galactocentric position diagram