Pismis 27

(MWSC 780)

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0.71 UTI
0.75
CN
0.94
Cdens
0.75
CC3
0.71
Clit
0.92
Cdup
Nm (P>50%) 112
Core radius and density 1.5 [pc], 4.7 [pc-2]
C3 classification AB
  • CN 0.75 Rich
  • Cdens 0.94 Very dense
  • CC3 0.75 High quality
  • Clit 0.71 Moderately studied
  • Cdup 0.92 Very likely unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Pismis 27 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

Note: This is very likely a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.

Palma et al. (2025)
Part of multiple system G118, along with HSC_1504, NGC_2175, UBC_1303 and FSR_0902.

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

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.81 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.81 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1042, e_all=0.1613.

Data
🔍 Search references for Pismis 27 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 92.726 20.618 0.508 -0.187 -2.048 32.501
Almeida et al. 2025 92.72 20.622 – – – –
Zhang et al. 2024 92.726 20.62 – – – –
Hunt & Reffert 2024 92.726 20.62 0.512 -0.237 -2.097 -7.869
Celli et al. 2024 92.719 20.617 – – – –
Cavallo et al. 2024 92.765 20.618 0.512 – – –
Hunt & Reffert 2023 92.726 20.62 0.512 -0.237 -2.097 -7.869
Almeida et al. 2023 92.717 20.62 – – – –
Just et al. 2023 92.721 20.616 – – – –
Dias et al. 2021 92.72 20.622 0.485 -0.14 -1.988 –
Cantat-Gaudin et al. 2020 92.719 20.617 0.504 -0.14 -1.994 –
Zhong et al. 2020 92.719 20.617 – -0.14 -1.994 -3.505
Cantat-Gaudin & Anders 2020 92.719 20.617 0.504 -0.14 -1.994 –
Cantat-Gaudin et al. 2018 92.719 20.617 0.504 -0.14 -1.994 –
Dib et al. 2018 92.73 20.615 – – – –
Loktin & Popova 2017 92.73 20.607 – 0.044 -1.939 –
Sampedro et al. 2017 92.725 20.607 – 2.9 -4.45 –
Joshi et al. 2016 92.73 20.615 – – – –
Kharchenko et al. 2016 92.721 20.616 – – – –
Kharchenko et al. 2013 92.73 20.615 – 0.98 -4.03 –
Bukowiecki et al. 2011 92.729 20.614 – – – –
Glushkova et al. 2010 92.724 20.607 – – – –
Dias et al. 2002 92.725 20.607 – -5.7 24.77 –

💡 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– 1.74 1.91 2.015 42 -0.098 198 0.75 –
Almeida et al. 2025 1.74 1.83 – 9 – 272 – –
Zhang et al. 2024 – – – – 0.182(1) – – –
Hunt & Reffert 2024 1.83 1.68 2.01 11 – 191(1) – –
Celli et al. 2024 – – – 5 – 212 – –
Cavallo et al. 2024 1.68 1.87 – 35 -0.100 – – –
Hunt & Reffert 2023 1.83 1.68 2.02 11 – – – –
Almeida et al. 2023 1.76 2.16 – 9 -0.098 205(1) 0.75 –
Just et al. 2023 – – – 178 – 45 – –
Dias et al. 2021 1.74 1.83 – 9 0.101 – – –
Cantat-Gaudin et al. 2020 1.89 1.50 – 5 – – – –
Kounkel et al. 2020 1.81 2.05 – 87 – – – –
Zhong et al. 2020 1.88(1) – – – -0.528 – – –
Cantat-Gaudin & Anders 2020 1.88 – – – – – – –
Cantat-Gaudin et al. 2018 1.88 – – – – – – –
Dib et al. 2018 1.66 – – 178 – – – –
Loktin & Popova 2017 2.49 1.77 – 85 – – – –
Joshi et al. 2016 1.66 1.91 – 178 – – – –
Kharchenko et al. 2016 1.66 1.91 – 178 – – – –
Kharchenko et al. 2013 1.66 1.91 – 178 – – – –
Bukowiecki et al. 2012 – – – – – 176 – –
Bukowiecki et al. 2011 1.74(1) 2.24 – 25 – – – –
Glushkova et al. 2010 1.00 2.15 – 50 – – – –
Dias et al. 2002 1.00 2.15 – 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
NGC 2175 8.0 92.4 20.6 0.5 0.29 -2.26 23.04 0.58
IRAS 06068+2030 3.6 92.45 20.51 0.52 0.17 -2.35 – 0.02
NGC 2174 1.8 92.44 20.52 0.54 0.14 -2.37 – 0.04

💡 Note: The % column shows the percentage of members that Pismis 27 shares with each listed object.

Visualization
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Pismis 27 UCC
Pismis 27 HUNT23
Pismis 27 CANTAT20
Galactocentric position diagram