NGC 6561

(MWSC 2834)

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0.95 UTI
0.75
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 100
Stellar density (N50/rad) 49.2 [N/pc2]
C3 classification AA
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
NGC 6561 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 76 along with CWNU_477, and as primordial binary cluster 292 along with NGC_6554, and of multiple system 26 along with NGC_6554 and CWNU_477.

Palma et al. (2025)
Part of multiple system G66, along with NGC_6554 and CWNU_477.

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

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg38' along with Gulliver 15.

Cavallo et al. (2024)
Gold sample.

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

Data
πŸ” Search references for NGC 6561 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 272.65 -16.733 0.673 -0.009 -0.78 -11.67
Liu et al. 2025 272.65 -16.73 0.67 0.0 -0.79 -35.44
Li et al. 2025 272.659 -16.74 0.655 -0.002 -0.754 –
Almeida et al. 2025 272.681 -16.741 – – – –
Hunt & Reffert 2024 272.645 -16.731 0.671 -0.003 -0.794 -35.442
Celli et al. 2024 272.659 -16.74 – – – –
Cavallo et al. 2024 272.651 -16.733 0.672 – – –
Hunt & Reffert 2023 272.645 -16.731 0.671 -0.003 -0.794 -35.442
Just et al. 2023 272.605 -16.731 – – – –
Dias et al. 2021 272.681 -16.741 0.659 -0.006 -0.748 –
Cantat-Gaudin et al. 2020 272.659 -16.74 0.655 -0.002 -0.754 –
SΓ‘nchez et al. 2020 272.625 -16.725 – -1.159 -1.731 –
Cantat-Gaudin & Anders 2020 272.659 -16.74 0.655 -0.002 -0.754 –
Soubiran et al. 2018 272.659 -16.74 – – – 1.62
Cantat-Gaudin et al. 2018 272.659 -16.74 0.655 -0.002 -0.754 –
Kharchenko et al. 2016 272.605 -16.731 – – – –
Dias et al. 2014 272.625 -16.725 – -0.04 -2.11 –
Kharchenko et al. 2013 272.613 -16.73 – 0.4 -1.5 -17.9
Morales et al. 2013 272.625 -16.725 – – – –
Gozha et al. 2012 272.625 -16.725 – – – –
Piskunov et al. 2008 272.617 -16.736 – – – –
Kharchenko et al. 2007 272.62 -16.73 – 0.18 – -17.93
Kharchenko et al. 2005 272.62 -16.73 – 0.02 0.02 -17.93

πŸ’‘ 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– 1.47 1.38 1.25 14 -0.257 412 – –
Liu et al. 2025 2.39 0.50 – 21 – – – –
Li et al. 2025 1.16 1.38 – 15 -0.257 – – –
Almeida et al. 2025 1.46 1.39 – 17 – 266 – –
Hunt & Reffert 2024 – – – – – 412(1) – –
Celli et al. 2024 – – – 19 – 298 – –
Cavallo et al. 2024 1.18 1.55 – 18 -0.420 – – –
Hunt & Reffert 2023 1.39 1.21 1.25 14 – – – –
Just et al. 2023 – – – 4 – 454 – –
Dias et al. 2021 1.46 1.39 – 17 0.328 – – –
Cantat-Gaudin et al. 2020 1.48 0.95 – 19 – – – –
Cantat-Gaudin & Anders 2020 1.46 – – – – – – –
Soubiran et al. 2018 1.46 – – – – – – –
Cantat-Gaudin et al. 2018 1.46 – – – – – – –
Kharchenko et al. 2016 2.49 2.13 – 4 – – – –
Kharchenko et al. 2013 2.49 2.13 – 4 – – – –
Morales et al. 2013 3.40 – – 8 – – – –
Gozha et al. 2012 3.40 – – 8 – 16596 – –
Piskunov et al. 2008 3.40 1.24 – 8 – – – –
Kharchenko et al. 2005 3.40 1.24 – 8 – – – –

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

Visualization
ℹ️
NGC 6561 UCC
NGC 6561 HUNT23
NGC 6561 CANTAT20
Galactocentric position diagram