NGC 6561
(MWSC 2834)
0.85
UTI
0.75
CN
1.0
Cdens
1.0
CC3
0.74
Clit
1.0
Cdup
Nm (P>50%)
100
Core radius and density
0.8 [pc], 18 [pc-2]
- CN 0.75 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.74 Moderately studied
- Cdup 1.0 Unique
π₯ Members
π Colab
π¬ Bayestar19
MOCA
π CDS
π Simbad
π CDS (Ξ±, Ξ΄)
π Simbad (Ξ±, Ξ΄)
MOCA
π CDS
π Simbad
π CDS (Ξ±, Ξ΄)
π Simbad (Ξ±, Ξ΄)
Overview
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 moderately studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999β | 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 | β |
| Almeida et al. | 2025 | 272.681 | -16.741 | β | β | β | β |
| Hunt & Reffert | 2024 | 272.645 | -16.731 | 0.671 | -0.003 | -0.794 | -35.442 |
| Celli et al. | 2024 | 272.659 | -16.74 | β | β | β | β |
| Cavallo et al. | 2024 | 272.651 | -16.733 | 0.672 | β | β | β |
| Hunt & Reffert | 2023 | 272.645 | -16.731 | 0.671 | -0.003 | -0.794 | -35.442 |
| Just et al. | 2023 | 272.605 | -16.731 | β | β | β | β |
| Dias et al. | 2021 | 272.681 | -16.741 | 0.659 | -0.006 | -0.748 | β |
| Cantat-Gaudin et al. | 2020 | 272.659 | -16.74 | 0.655 | -0.002 | -0.754 | β |
| SΓ‘nchez et al. | 2020 | 272.625 | -16.725 | β | -1.159 | -1.731 | β |
| Cantat-Gaudin & Anders | 2020 | 272.659 | -16.74 | 0.655 | -0.002 | -0.754 | β |
| Soubiran et al. | 2018 | 272.659 | -16.74 | β | β | β | 1.62 |
| Cantat-Gaudin et al. | 2018 | 272.659 | -16.74 | 0.655 | -0.002 | -0.754 | β |
| Dias et al. | 2018 | β | β | β | -0.66 | -2.06 | β |
| Sampedro et al. | 2017 | 272.625 | -16.725 | β | -0.04 | -2.77 | β |
| Kharchenko et al. | 2016 | 272.605 | -16.731 | β | β | β | β |
| Dias et al. | 2014 | 272.625 | -16.725 | β | -0.04 | -2.11 | β |
| Kharchenko et al. | 2013 | 272.613 | -16.73 | β | 0.4 | -1.5 | -17.9 |
| Morales et al. | 2013 | 272.625 | -16.725 | β | β | β | β |
| Gozha et al. | 2012 | 272.625 | -16.725 | β | β | β | β |
| Piskunov et al. | 2008 | 272.617 | -16.736 | β | β | β | β |
| Kharchenko et al. | 2007 | 272.62 | -16.73 | β | 0.18 | β | -17.93 |
| Kharchenko et al. | 2005 | 272.62 | -16.73 | β | 0.02 | 0.02 | -17.93 |
π‘ 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 | 99999β | 1.47 | 1.38 | 1.25 | 14 | -0.257 | 412 | β | β |
| Liu et al. | 2025 | 2.39 | 0.50 | β | 21 | β | β | β | β |
| Li et al. | 2025 | 1.16 | 1.38 | β | 15 | -0.257 | β | β | β |
| Almeida et al. | 2025 | 1.46 | 1.39 | β | 17 | β | 266 | β | β |
| Hunt & Reffert | 2024 | 1.39 | 1.21 | 1.25 | 14 | β | 412(1) | β | β |
| Celli et al. | 2024 | β | β | β | 19 | β | 298 | β | β |
| Cavallo et al. | 2024 | 1.18 | 1.55 | β | 18 | -0.420 | β | β | β |
| Hunt & Reffert | 2023 | 1.39 | 1.21 | 1.25 | 14 | β | β | β | β |
| Just et al. | 2023 | β | β | β | 4 | β | 454 | β | β |
| Dias et al. | 2021 | 1.46 | 1.39 | β | 17 | 0.328 | β | β | β |
| Cantat-Gaudin et al. | 2020 | 1.48 | 0.95 | β | 19 | β | β | β | β |
| Kounkel et al. | 2020 | 1.62 | 1.94 | β | 10 | β | β | β | β |
| Cantat-Gaudin & Anders | 2020 | 1.46 | β | β | β | β | β | β | β |
| Soubiran et al. | 2018 | 1.46 | β | β | β | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 1.46 | β | β | β | β | β | β | β |
| Kharchenko et al. | 2016 | 2.49 | 2.17 | β | 4 | β | β | β | β |
| Kharchenko et al. | 2013 | 2.49 | 2.17 | β | 4 | β | β | β | β |
| Morales et al. | 2013 | 3.40 | β | β | 8 | β | β | β | β |
| Gozha et al. | 2012 | 3.40 | β | β | 8 | β | 16596 | β | β |
| Piskunov et al. | 2008 | 3.40 | 1.26 | β | 8 | β | β | β | β |
| Kharchenko et al. | 2005 | 3.40 | 1.26 | β | 8 | β | β | β | β |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
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.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.
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=0.1254, e_all=0.0323.
Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg38' along with Gulliver 15.
Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.