NGC 1664

(Melotte 27; Collinder 56; MWSC 430; OCL 411; FoF 1365)

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0.95 UTI
1.0
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 634
Stellar density (N50/rad) 48.2 [N/pc2]
C3 classification AB
  • CN 1.0 Very 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
ℹī¸
NGC 1664 is a very rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the 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: 1.00 (50th percentile).

Ahumada & Lapasset (2007)
Only the photoelectric data of (1961PUSNO..17..343H) were examined. The apparent cluster diameter was taken from (1970PDDO....4....1H). Star 1=HD 30650 has a membership probability of 91% according to (1973AJ.....78...53K), and a spectrum B3V according to (1965ApJS...12..215H). Star 4 (ref. 181) = 578 (WEBDA) also appears as a blue straggler, but it is not a cluster member according to (1973AJ.....78...53K).

Data
🔍 Search references for NGC 1664 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 72.755 43.666 0.738 1.607 -5.788 2.289
Otto et al. 2026 72.766 43.675 – 1.7 -5.74 6.9
Li et al. 2025 72.763 43.676 0.734 1.703 -5.738 –
Hu & Soubiran 2025 72.755 43.677 – – – –
Wei et al. 2025 72.752 43.673 0.736 1.597 -5.808 –
Almeida et al. 2025 72.754 43.674 – – – –
Zhang et al. 2024 72.766 43.675 – – – –
Hunt & Reffert 2024 72.766 43.675 0.736 1.608 -5.803 4.112
Cavallo et al. 2024 72.755 43.677 0.734 – – –
Hunt & Reffert 2023 72.766 43.675 0.736 1.608 -5.803 4.112
Almeida et al. 2023 72.743 43.673 – – – –
Cordoni et al. 2023 72.754 43.674 0.733 1.727 -5.72 –
Just et al. 2023 72.798 43.66 – – – –
Tarricq et al. 2022 72.769 43.685 0.749 1.615 -5.799 –
Jadhav & Subramaniam 2021 72.763 43.676 – – – –
Jaehnig et al. 2021 72.755 43.676 0.76 1.695 -5.715 –
Rain et al. 2021 72.763 43.676 0.734 1.703 -5.738 –
Dias et al. 2021 72.754 43.674 0.733 1.727 -5.72 6.308
Spina et al. 2021 72.759 43.677 0.732 1.725 -5.721 –
Cantat-Gaudin et al. 2020 72.763 43.676 0.734 1.703 -5.738 –
Donor et al. 2020 72.808 43.66 – 1.84 -5.76 7.0
Zhong et al. 2020 72.763 43.676 – 1.703 -5.738 1.442
Cantat-Gaudin & Anders 2020 72.763 43.676 0.734 1.703 -5.738 –
Liu & Pang 2019 72.765 43.674 0.737 1.733 -5.701 –
Bossini et al. 2019 72.763 43.676 – – – –
Soubiran et al. 2018 72.763 43.676 – – – 6.38
Bica et al. 2019 72.775 43.684 – – – –
Cantat-Gaudin et al. 2018 72.763 43.676 0.734 1.703 -5.738 –
Loktin & Popova 2017 72.78 43.676 – -4.594 -3.24 36.1
Kharchenko et al. 2016 72.798 43.66 – – – –
Dias et al. 2014 72.775 43.675 – -1.83 -4.15 –
Kharchenko et al. 2013 72.808 43.66 – -4.23 -4.2 36.1
Gozha et al. 2012 72.775 43.675 – – – –
Kharchenko et al. 2012 72.808 43.66 – -4.4 -4.6 36.1
Bukowiecki et al. 2011 72.767 43.644 – – – –
Piskunov et al. 2008 72.782 43.662 – – – –
Kharchenko et al. 2007 72.78 43.67 – 0.33 – 36.1
Piskunov et al. 2007 72.782 43.662 – – – –
Ahumada & Lapasset 2007 72.775 43.667 – – – –
van den Bergh 2006 72.8 43.667 – – – –
Kharchenko et al. 2005 72.79 43.66 – -2.54 -6.21 36.1
Kharchenko et al. 2003 72.78 43.7 – -2.44 -5.86 –
Chen et al. 2003 72.738 43.623 – 1.96 -5.1 7.8
Dias et al. 2002 72.775 43.675 – 1.96 -5.1 7.5
Lynga 1987 72.767 43.692 – – – 29.0
Sulentic et al. 1973 72.747 43.708 – – – –

💡 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– 1.25 0.79 0.52 513 -0.030 912 0.41 0
Otto et al. 2026 – – – 513 -0.040(15) – – –
Li et al. 2025 1.26 0.82 – 604 -0.037 – – –
Hu & Soubiran 2025 – – – – -0.110(5) – – –
Wei et al. 2025 1.95 0.80 – 501 0.500 1133 0.33 –
Almeida et al. 2025 1.22 0.87 – 643 – 968 – –
Zhang et al. 2024 – – – – -0.092(1) – – –
Hunt & Reffert 2024 – – – – – 1822(1) – –
Cavallo et al. 2024 1.37 0.72 – 661 0.370 – – –
Hunt & Reffert 2023 1.27 0.72 0.52 340 – – – –
Almeida et al. 2023 1.28 0.92 – 555 -0.005 778(1) 0.43 –
Cordoni et al. 2023 1.22 0.87 – 643 -0.009 1191 0.41 0(1)
Just et al. 2023 – – – 562 – 207 – –
Spina et al. 2022 – – – – -0.030 – – –
Tarricq et al. 2022 1.30 – – 525 – – – –
Jadhav & Subramaniam 2021 1.34 0.69 – 513 – 1464 – 0(1)
Jaehnig et al. 2021 1.31(1) – – – – – – –
Rain et al. 2021 1.31 0.79 – 288 – – – 0
Dias et al. 2021 1.22 0.87 – 643 -0.009 – – –
Spina et al. 2021 1.38 – – 513 -0.031(20) – – –
Cantat-Gaudin et al. 2020 1.34 0.69 – 513 – – – –
Kounkel et al. 2020 1.22 0.76 – 447 – – – –
Donor et al. 2020 – – – – -0.030 – – –
Zhong et al. 2020 1.31(1) 0.72 – 8673 -0.156 – – –
Cantat-Gaudin & Anders 2020 1.31 – – – – – – –
Liu & Pang 2019 – – – 372 0.250 – – –
Bossini et al. 2019 1.33 0.71 – 471 0.000 – – –
Soubiran et al. 2018 1.31 – – – – – – –
Cantat-Gaudin et al. 2018 1.31 – – – – – – –
Loktin & Popova 2017 1.24 0.81 – 289 – – – –
Kharchenko et al. 2016 1.20 0.79 – 562 – – – –
Kharchenko et al. 2013 1.20 0.79 – 562 – – – –
Bukowiecki et al. 2012 – – – – – 455 – –
Gozha et al. 2012 1.20 – – 292 – 912 – –
Kharchenko et al. 2012 1.20 0.79 – 550 – – – –
Bukowiecki et al. 2011 1.47(1) 1.14 – 282 – – – –
Piskunov et al. 2008 1.20 0.79 – 525 – 640(1) – –
Piskunov et al. 2007 1.20 0.79 – 525 – 192 – –
Ahumada & Lapasset 2007 – 0.79 – 282 – – – 1
van den Bergh 2006 1.20 0.79 – 288 – – – –
Kharchenko et al. 2005 1.20 0.79 – 525 – – – –
Kharchenko et al. 2003 1.20 0.79 – – – – – –
Chen et al. 2003 1.20 – – 290 – – – –
Dias et al. 2002 1.20 0.80 – 292 – – – –
Lynga 1987 1.20 0.76 – 302 – – – –

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

Visualization
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NGC 1664 UCC
NGC 1664 HUNT23
NGC 1664 CANTAT20
Galactocentric position diagram