NGC 2818

(FoF 623)

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0.98 UTI
0.88
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 449
Core radius and density 2.3 [pc], 5.2 [pc-2]
C3 classification AA
  • CN 0.88 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 2818 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1729, e_all=0.1768.

Data
πŸ” Search references for NGC 2818 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 139.044 -36.624 0.302 -4.421 4.543 20.624
Li et al. 2025 139.044 -36.624 0.275 -4.439 4.528 –
Hu & Soubiran 2025 139.048 -36.623 – – – –
Wei et al. 2025 139.044 -36.615 0.301 -4.409 4.539 –
Almeida et al. 2025 139.045 -36.621 – – – –
Hunt & Reffert 2024 139.042 -36.621 0.3 -4.421 4.546 13.359
Cavallo et al. 2024 139.048 -36.623 0.3 – – –
Hunt & Reffert 2023 139.042 -36.621 0.3 -4.421 4.546 13.359
Almeida et al. 2023 139.041 -36.617 – – – –
Cordoni et al. 2023 139.045 -36.621 0.277 -4.43 4.53 –
Jadhav & Subramaniam 2021 139.044 -36.624 – – – –
Jaehnig et al. 2021 139.042 -36.617 0.313 -4.424 4.532 –
Rain et al. 2021 139.044 -36.624 0.275 -4.439 4.528 –
Dias et al. 2021 139.045 -36.621 0.277 -4.43 4.53 21.849
Cantat-Gaudin et al. 2020 139.044 -36.624 0.275 -4.439 4.528 –
SΓ‘nchez et al. 2020 139.004 -36.625 – -4.5 4.627 –
Cantat-Gaudin & Anders 2020 139.044 -36.624 0.275 -4.439 4.528 –
Liu & Pang 2019 139.055 -36.617 0.285 -4.429 4.485 –
Bossini et al. 2019 139.044 -36.624 – – – –
Soubiran et al. 2018 139.044 -36.624 – – – 21.48
Cantat-Gaudin et al. 2018 139.044 -36.624 0.275 -4.439 4.528 –
Dias et al. 2018 – – – -3.76 3.44 –
Loktin & Popova 2017 139.005 -36.624 – -4.0 5.27 20.7
Sampedro et al. 2017 139.004 -36.625 – -3.88 5.21 –
Dias et al. 2014 139.004 -36.625 – -4.0 5.27 –
Gozha et al. 2012 139.004 -36.625 – – – –
Bukowiecki et al. 2011 139.042 -36.63 – – – –
Kharchenko et al. 2007 139.0 -36.62 – 0.08 – –
Ahumada & Lapasset 2007 139.0 -36.633 – – – –
van den Bergh 2006 139.007 -36.627 – – – –
Chen et al. 2003 139.001 -36.628 – – – –
Dias et al. 2002 139.004 -36.625 – -4.0 5.27 20.69
Lynga 1987 139.01 -36.621 – – – –
van den Bergh & Hagen 1975 138.5 -36.4 – – – –
Sulentic et al. 1973 139.002 -36.605 – – – –

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– 3.05 0.52 0.56 916 -0.170 1344 0.51 2
Li et al. 2025 2.84 0.63 – 1347 -0.343 – – –
Hu & Soubiran 2025 – – – – -0.200(5) – – –
Wei et al. 2025 4.06 0.70 – 1070 0.000 2468 0.51 –
Almeida et al. 2025 2.76 0.52 – 1167 – 1344 – –
Hunt & Reffert 2024 3.05 0.19 0.56 1078 – 2187(1) – –
Cavallo et al. 2024 2.77 0.52 – 1175 -0.010 – – –
Hunt & Reffert 2023 3.05 0.19 0.56 1079 – – – –
Almeida et al. 2023 2.91 0.54 – 1256 -0.097 1100(1) 0.58 –
Cordoni et al. 2023 2.76 0.52 – 1167 -0.099 1272 0.39 3(1)
Jadhav & Subramaniam 2021 3.09 0.43 – 832 – 2036 – 1(1)
Jaehnig et al. 2021 3.23(1) – – – – – – –
Rain et al. 2021 3.29 0.38 – 417 – – – 5
Dias et al. 2021 2.76 0.52 – 1167 -0.099 – – –
Cantat-Gaudin et al. 2020 3.09 0.43 – 832 – – – –
Kounkel et al. 2020 3.44 0.60 – 912 – – – –
Cantat-Gaudin & Anders 2020 3.29 – – – – – – –
Liu & Pang 2019 – – – 1410 -0.500 – – –
Bossini et al. 2019 3.15 0.60 – 916 -0.170 – – –
Soubiran et al. 2018 3.29 – – – – – – –
Cantat-Gaudin et al. 2018 3.29 – – – – – – –
Loktin & Popova 2017 1.85 0.38 – 423 – – – –
Bukowiecki et al. 2012 – – – – – 1209 – –
Gozha et al. 2012 1.85 – – 423 -0.170 – – –
Bukowiecki et al. 2011 3.01(1) 0.66 – 631 – – – –
Paunzen et al. 2010 – – – – -0.300 – – –
Ahumada & Lapasset 2007 – 0.38 – 427 – – – 2
van den Bergh 2006 1.85 0.38 – 427 – – – –
Chen et al. 2003 1.85 0.38 – 420 -0.170(1) – – –
Dias et al. 2002 1.85 0.38 – 423 -0.170 – – –
Lynga 1987 3.20 0.66 – 1000 – – – –

(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 2818A 94.7 139.04 -36.62 0.3 -4.42 4.54 20.62 0.06

πŸ’‘ Note: The % column shows the percentage of members that NGC 2818 shares with each listed object.

Visualization
ℹ️
NGC 2818 UCC
NGC 2818 HUNT23
NGC 2818 CANTAT20
Galactocentric position diagram