Pismis 18
(MWSC 2142)
0.97
UTI
0.87
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Stellar density (N50/rad)
67.6 [N/pc2]
- CN 0.87 Rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 1.0 Very well-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
Pismis 18 is a 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, intermediate-age 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999β | 204.23 | -62.091 | 0.347 | -5.695 | -2.27 | -28.578 |
| Li et al. | 2025 | 204.227 | -62.091 | 0.332 | -5.658 | -2.286 | β |
| Hu & Soubiran | 2025 | 204.213 | -62.095 | β | β | β | β |
| Almeida et al. | 2025 | 204.232 | -62.096 | β | β | β | β |
| Hunt & Reffert | 2024 | 204.227 | -62.091 | 0.347 | -5.692 | -2.269 | -27.593 |
| Cavallo et al. | 2024 | 204.213 | -62.095 | 0.347 | β | β | β |
| Hunt & Reffert | 2023 | 204.227 | -62.091 | 0.347 | -5.692 | -2.269 | -27.593 |
| Just et al. | 2023 | 204.222 | -62.062 | β | β | β | β |
| Jaehnig et al. | 2021 | 204.227 | -62.091 | 0.356 | -5.66 | -2.272 | β |
| Rain et al. | 2021 | 204.227 | -62.091 | 0.332 | -5.658 | -2.286 | β |
| Dias et al. | 2021 | 204.232 | -62.096 | 0.328 | -5.672 | -2.296 | -28.04 |
| Cantat-Gaudin et al. | 2020 | 204.227 | -62.091 | 0.332 | -5.658 | -2.286 | β |
| SΓ‘nchez et al. | 2020 | 204.229 | -62.093 | β | -5.66 | -2.336 | β |
| Cantat-Gaudin & Anders | 2020 | 204.227 | -62.091 | 0.332 | -5.658 | -2.286 | β |
| Soubiran et al. | 2018 | 204.227 | -62.091 | β | β | β | -28.45 |
| Cantat-Gaudin et al. | 2018 | 204.227 | -62.091 | 0.332 | -5.658 | -2.286 | β |
| Kharchenko et al. | 2016 | 204.222 | -62.062 | β | β | β | β |
| Dias et al. | 2014 | 204.229 | -62.093 | β | -2.43 | -5.11 | β |
| Kharchenko et al. | 2013 | 204.232 | -62.065 | β | -8.25 | -1.7 | β |
| Morales et al. | 2013 | 204.229 | -62.093 | β | β | β | β |
| Bukowiecki et al. | 2011 | 204.246 | -62.062 | β | β | β | β |
| van den Bergh | 2006 | 204.225 | -62.092 | β | β | β | β |
| Dias et al. | 2002 | 204.229 | -62.093 | β | -2.43 | -5.11 | -27.9 |
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 | 2.33 | 1.715 | 1.22 | 918 | 0.043 | 2576 | β | 0.0 |
| Li et al. | 2025 | 2.33 | 1.96 | β | 754 | 0.226 | β | β | β |
| Hu & Soubiran | 2025 | β | β | β | β | -0.250(5) | β | β | β |
| Almeida et al. | 2025 | 2.19 | 2.17 | β | 679 | β | 1609 | β | β |
| Hunt & Reffert | 2024 | β | β | β | β | β | 3543(1) | β | β |
| Cavallo et al. | 2024 | 2.09 | 2.03 | β | 1000 | 0.120 | β | β | β |
| Hunt & Reffert | 2023 | 2.67 | 2.40 | 1.22 | 323 | β | β | β | β |
| Just et al. | 2023 | β | β | β | 944 | β | 655 | β | β |
| Jaehnig et al. | 2021 | 2.78(1) | β | β | β | β | β | β | β |
| Rain et al. | 2021 | 2.77 | 1.55 | β | 1202 | β | β | β | 0 |
| Dias et al. | 2021 | 2.19 | 2.17 | β | 679 | -0.033 | β | β | β |
| Cantat-Gaudin et al. | 2020 | 2.86 | 1.81 | β | 575 | β | β | β | β |
| Cantat-Gaudin & Anders | 2020 | 2.77 | β | β | β | β | β | β | β |
| Soubiran et al. | 2018 | 2.77 | β | β | β | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 2.77 | β | β | β | β | β | β | β |
| Kharchenko et al. | 2016 | 2.31 | 1.62 | β | 944 | β | β | β | β |
| Kharchenko et al. | 2013 | 2.31 | 1.62 | β | 944 | β | β | β | β |
| Morales et al. | 2013 | 2.24 | β | β | 891 | β | β | β | β |
| Bukowiecki et al. | 2012 | β | β | β | β | β | 4272 | β | β |
| Bukowiecki et al. | 2011 | 2.77(1) | 1.61 | β | 891 | β | β | β | β |
| van den Bergh | 2006 | 2.24 | 1.55 | β | 1202 | β | β | β | β |
| Dias et al. | 2002 | 2.24 | 1.55 | β | 1202 | β | β | β | β |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.
Cavallo et al. (2024)
Gold sample.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Gold sample.