NGC 2184

(MWSC 784)

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0.95 UTI
0.76
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 119
Radius (P>50% members) 12.4 [arcmin]
  • CN 0.76 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 2184 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a 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 large percentage of members with 2 later reported entries. See table with shared members information.

Close Low extinction Near-solar metallicity Intermediate age

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 a moving group.

Data
🔍 Search references for NGC 2184 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 91.721 -2.043 1.733 -0.663 -0.24 40.139
Li et al. 2025 91.69 -2.0 1.709 -0.648 -0.288 –
Almeida et al. 2025 91.728 -1.928 – – – –
Alfonso et al. 2024 92.008 -2.39 1.626 -0.61 -0.513 –
Zhang et al. 2024 92.852 -3.372 – – – –
Cavallo et al. 2024 92.642 -3.373 1.535 – – –
Hunt & Reffert 2023 92.852 -3.372 1.535 -1.624 -1.907 25.717
Almeida et al. 2023 91.783 -1.923 – – – –
Just et al. 2023 92.821 -3.419 – – – –
He et al. 2022 91.701 -2.036 1.735 -0.664 -0.236 –
Tarricq et al. 2022 91.668 -2.038 1.721 -0.645 -0.251 –
Dias et al. 2021 91.728 -1.928 1.707 -0.626 -0.318 42.043
Cantat-Gaudin et al. 2020 91.69 -2.0 1.709 -0.648 -0.288 –
Cantat-Gaudin & Anders 2020 91.69 -2.0 1.709 -0.648 -0.288 –
Bossini et al. 2019 91.69 -2.0 – – – –
Soubiran et al. 2018 91.69 -2.0 – – – 42.03
Bica et al. 2019 92.833 -3.533 – – – –
Cantat-Gaudin et al. 2018 91.69 -2.0 1.709 -0.648 -0.288 –
Loktin & Popova 2017 92.745 -3.482 – -2.7 -1.31 –
Kharchenko et al. 2016 92.821 -3.419 – – – –
Dias et al. 2014 92.75 -3.483 – -2.93 0.42 –
Kharchenko et al. 2013 92.827 -3.42 – -2.7 -1.31 –
Piskunov et al. 2008 92.797 -3.441 – – – –
Kharchenko et al. 2005 92.8 -3.44 – -3.59 -1.93 –

💡 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] Bfr BSS
Li et al. 2025 0.56 0.52 – 853 -0.051 – – –
Almeida et al. 2025 0.58 0.69 – 766 – 204 – –
Alfonso et al. 2024 0.59 0.48 – 846 -0.078 – – –
Zhang et al. 2024 – – – – -0.087* – – –
Cavallo et al. 2024 0.69 0.54 – 43 -0.440 – – –
Hunt & Reffert 2023 0.62 0.21 0.28 135 – – – –
Almeida et al. 2023 0.56 0.66 – 933 -0.121 196* 0.53 –
Just et al. 2023 – – – 398 – 7 – –
He et al. 2022 – 0.65 – 891 – – – –
Tarricq et al. 2022 0.58 – – 661 – – – –
Dias et al. 2021 0.58 0.69 – 766 -0.077 – – –
Cantat-Gaudin et al. 2020 0.59 0.48 – 646 – – – –
Cantat-Gaudin & Anders 2020 0.58 – – – – – – –
Bossini et al. 2019 0.53 0.32 – 873 0.000 – – –
Soubiran et al. 2018 0.58 – – – – – – –
Cantat-Gaudin et al. 2018 0.58 – – – – – – –
Loktin & Popova 2017 0.66 0.25 – 234 – – – –
Kharchenko et al. 2016 0.62 0.32 – 398 – – – –
Kharchenko et al. 2013 0.62 0.32 – 398 – – – –
Piskunov et al. 2008 0.64 0.25 – 234 – – – –
Kharchenko et al. 2005 0.64 0.25 – 234 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Theia 1408 99.2 91.7 -2.04 1.74 -0.66 -0.24 40.07 0.05
CWWDL 14289 42.0 91.68 -2.01 1.74 -0.66 -0.24 40.11 0.0

💡 Note: The % column shows the percentage of members that NGC 2184 shares with each listed object.

Visualization
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NGC 2184 UCC
NGC 2184 HUNT23
NGC 2184 CANTAT20
Galactocentric position diagram