NGC 6649

(Melotte 206; MWSC 2949; OCL 66; FoF 293)

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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%) 1189
Core radius and density 1.4 [pc], 41 [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 6649 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 high extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the distance, 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.

Liu et al. (2025)
Classified as primordial binary cluster 164 along with HSC_226.

Palma et al. (2025)
Classified as genetic pair P226, along with HSC_226.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

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

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0429, e_all=0.0467.

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.

Data
🔍 Search references for NGC 6649 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 278.358 -10.4 0.474 0.032 -0.116 7.443
Li et al. 2025 278.359 -10.399 0.467 -0.007 -0.055 –
Almeida et al. 2025 278.359 -10.398 – – – –
Hunt & Reffert 2024 278.359 -10.402 0.473 0.037 -0.115 26.441
Cavallo et al. 2024 278.36 -10.399 0.471 – – –
Hunt & Reffert 2023 278.359 -10.402 0.473 0.037 -0.115 26.441
Just et al. 2023 278.332 -10.401 – – – –
Jaehnig et al. 2021 278.361 -10.399 0.506 -0.009 -0.039 –
Rain et al. 2021 278.359 -10.399 0.467 -0.007 -0.055 –
Richer et al. 2021 278.356 -10.4 0.469 -0.007 -0.052 –
Dias et al. 2021 278.359 -10.398 0.467 -0.011 -0.044 -8.854
Spina et al. 2021 278.359 -10.4 0.469 -0.015 -0.038 –
Cantat-Gaudin et al. 2020 278.359 -10.399 0.467 -0.007 -0.055 –
Cantat-Gaudin & Anders 2020 278.359 -10.399 0.467 -0.007 -0.055 –
Liu & Pang 2019 278.354 -10.402 0.472 -0.003 -0.084 –
Soubiran et al. 2018 278.359 -10.399 – – – -8.87
Bica et al. 2019 278.36 -10.396 – – – –
Cantat-Gaudin et al. 2018 278.359 -10.399 0.467 -0.007 -0.055 –
Dias et al. 2018 – – – -4.14 -1.45 –
Dib et al. 2018 278.34 -10.4 – – – –
Loktin & Popova 2017 278.37 -10.404 – -1.43 -2.479 -8.8
Sampedro et al. 2017 278.363 -10.403 – -0.3 1.05 –
Joshi et al. 2016 278.34 -10.4 – – – –
Kharchenko et al. 2016 278.332 -10.401 – – – –
Dias et al. 2014 278.362 -10.403 – -0.46 0.07 –
Kharchenko et al. 2013 278.34 -10.4 – -1.1 -2.86 -8.8
Morales et al. 2013 278.363 -10.403 – – – –
Gozha et al. 2012 278.362 -10.403 – – – –
Kharchenko et al. 2007 278.37 -10.4 – 0.04 – –
Ahumada & Lapasset 2007 278.35 -10.4 – – – –
van den Bergh 2006 278.375 -10.4 – – – –
Dias et al. 2002 278.363 -10.403 – 0.93 -3.84 -8.59
Dambis 1999 278.362 -10.403 – – – –
Lynga 1987 278.36 -10.396 – – – –
Sulentic et al. 1973 278.371 -10.397 – – – –

💡 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– 1.92 3.845 1.92 50 0.051 4349 – 0
Liu et al. 2025 8.39 1.47 – 56 – – – –
Li et al. 2025 0.78 2.88 – 2660 0.053 – – –
Almeida et al. 2025 1.92 3.68 – 41 – 4349 – –
Hunt & Reffert 2024 1.95 4.59 1.92 28 – 10140(1) – –
Cavallo et al. 2024 2.07 4.55 – 43 0.560 – – –
Hunt & Reffert 2023 1.96 4.58 1.92 28 – – – –
Just et al. 2023 – – – 126 – 76 – –
Jaehnig et al. 2021 1.98(1) – – – – – – –
Rain et al. 2021 2.02 3.79 – 36 – – – 0
Richer et al. 2021 – 2.21 – – – – – –
Dias et al. 2021 1.92 3.68 – 41 0.440 – – –
Spina et al. 2021 2.15 – – 71 – – – –
Cantat-Gaudin et al. 2020 2.13 3.90 – 71 – – – –
Kounkel et al. 2020 2.17 4.08 – 115 – – – –
Cantat-Gaudin & Anders 2020 2.02 – – – – – – –
Liu & Pang 2019 – – – 120 -1.250 – – –
Soubiran et al. 2018 2.02 – – – – – – –
Cantat-Gaudin et al. 2018 2.02 – – – – – – –
Dib et al. 2018 1.56 – – 126 – – – –
Loktin & Popova 2017 1.34 4.22 – 32 – – – –
Joshi et al. 2016 1.56 4.20 – 126 – – – –
Kharchenko et al. 2016 1.56 4.20 – 126 – – – –
Kharchenko et al. 2013 1.56 4.20 – 126 – – – –
Morales et al. 2013 1.37 – – 37 – – – –
Gozha et al. 2012 1.37 – – 37 0.050 – – –
Paunzen et al. 2010 – – – – 0.050 – – –
Ahumada & Lapasset 2007 – 3.79 – 37 – – – 1
van den Bergh 2006 1.37 3.79 – 37 – – – –
Dias et al. 2002 1.37 3.79 – 37 – – – –
Dambis 1999 1.67 4.11 – 79 – – – –
Lynga 1987 1.63 3.66 – 50 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWNU 2835 0.5 278.36 -10.32 0.43 0.24 -0.7 26.05 0.05

💡 Note: The % column shows the percentage of members that NGC 6649 shares with each listed object.

Visualization
ℹī¸
NGC 6649 UCC
NGC 6649 HUNT23
NGC 6649 CANTAT20
Galactocentric position diagram