NGC 2243

(Melotte 46; Collinder 98; MWSC 880; OCL 644; ESO 426 16; FSR 1296; FoF 3)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 1336
Core radius and density 1.4 [pc], 29 [pc-2]
C3 classification AA
  • CN 1.0 Very 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 2243 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, well below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption, age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Rain et al. (2024)
This cluster hosts only a few BSSs. Those offset from the ZAMS are consistent with binary evolution, with some appearing as evolved binaries, though not yet classified as YSSs.

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1102, e_all=0.1768.

Rain et al. (2021)
Best fit with log(t)=9.5

Data
🔍 Search references for NGC 2243 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 97.393 -31.283 0.227 -1.263 5.5 60.162
Otto et al. 2026 97.396 -31.283 – -1.28 5.49 59.9
Li et al. 2025 97.395 -31.282 0.211 -1.279 5.488 –
Guerco et al. 2025 97.4 -31.3 0.22 -1.24 5.5 60.0
Hu & Soubiran 2025 97.39 -31.281 – – – –
Carrasco-Varela et al. 2025 97.539 -31.317 – – – –
Almeida et al. 2025 97.392 -31.283 – – – –
Hunt & Reffert 2024 97.396 -31.283 0.223 -1.267 5.494 59.993
Cavallo et al. 2024 97.39 -31.281 0.221 – – –
Rain et al. 2024 97.393 -31.284 0.222 -1.263 5.493 –
Hunt & Reffert 2023 97.396 -31.283 0.223 -1.267 5.494 59.993
Angelo et al. 2023 97.383 -31.285 – -1.26 5.5 –
Just et al. 2023 97.387 -31.284 – – – –
Jadhav & Subramaniam 2021 97.395 -31.282 – – – –
Jaehnig et al. 2021 97.396 -31.284 0.241 -1.287 5.498 –
Netopil et al. 2022 97.392 -31.283 – – – 60.02
Rain et al. 2021 97.395 -31.282 0.211 -1.279 5.488 –
Dias et al. 2021 97.392 -31.283 0.217 -1.282 5.489 59.611
Spina et al. 2021 97.394 -31.282 0.216 -1.285 5.494 –
Cantat-Gaudin et al. 2020 97.395 -31.282 0.211 -1.279 5.488 –
Donor et al. 2020 97.392 -31.285 – -1.28 5.5 59.8
Cantat-Gaudin & Anders 2020 97.395 -31.282 0.211 -1.279 5.488 –
Liu & Pang 2019 97.385 -31.279 0.257 -1.261 5.493 –
Soubiran et al. 2018 97.395 -31.282 – – – 59.63
Bica et al. 2019 97.397 -31.283 – – – –
Cantat-Gaudin et al. 2018 97.395 -31.282 0.211 -1.279 5.488 –
Dias et al. 2018 – – – -2.41 4.61 –
Loktin & Popova 2017 97.395 -31.282 – -0.49 4.02 55.0
Sampedro et al. 2017 97.392 -31.283 – -0.54 3.36 –
Kharchenko et al. 2016 97.387 -31.284 – – – –
Netopil et al. 2016 97.392 -31.283 – – – –
Dias et al. 2014 97.392 -31.283 – -0.48 4.02 –
Kharchenko et al. 2013 97.392 -31.285 – -2.81 4.09 55.0
Gozha et al. 2012 97.392 -31.283 – – – –
Bukowiecki et al. 2011 97.388 -31.278 – – – –
Kharchenko et al. 2007 97.39 -31.28 – 0.04 – –
Ahumada & Lapasset 2007 97.4 -31.283 – – – –
van den Bergh 2006 97.392 -31.283 – – – –
Chen et al. 2003 97.449 -31.287 – – – –
Dias et al. 2002 97.392 -31.283 – -0.49 4.02 59.84
Lynga 1987 97.449 -31.287 – – – –
Sulentic et al. 1973 97.437 -31.284 – – – –

💡 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– 4.17 0.16 0.35 3183 -0.460 4401 0.16 8
Otto et al. 2026 – – – 4365 -0.460(15) – – –
Li et al. 2025 4.03 0.24 – 3136 -0.386 – – –
Guerco et al. 2025 – – – 4370 -0.480 – – –
Hu & Soubiran 2025 – – – – -0.380(5) – – –
Carrasco-Varela et al. 2025 4.00 0.27 – 3443 -0.450 – – 6(1)
Almeida et al. 2025 4.00 0.27 – 3443 – 3681 – –
Hunt & Reffert 2024 3.95 0.03 0.35 2748 – 5121(1) – –
Cavallo et al. 2024 2.91 0.67 – 3890 -0.940 – – –
Rain et al. 2024 4.08 0.00 – 3426 – 9279 0.16 –
Hunt & Reffert 2023 3.95 0.03 0.35 2748 – – – –
Angelo et al. 2023 3.80 0.32 – 3548 -0.470 13(1) – –
Just et al. 2023 – – – 1365 – 1832 – –
Spina et al. 2022 – – – – -0.460 – – –
Jadhav & Subramaniam 2021 3.72 0.02 – 4365 – 7576 – 8(1)
Jaehnig et al. 2021 4.29(1) – – – – – – –
Netopil et al. 2022 3.53(1) – – 4786 -0.460(1) – – –
Rain et al. 2021 4.17 0.16 – 1072 – – – 14
Dias et al. 2021 4.00 0.27 – 3443 -0.482 – – –
Spina et al. 2021 4.34 – – 4365 -0.472(20) – – –
Cantat-Gaudin et al. 2020 3.72 0.02 – 4365 – – – –
Kounkel et al. 2020 4.51 0.35 – 1698 – – – –
Donor et al. 2020 – – – – -0.460 – – –
Cantat-Gaudin & Anders 2020 4.17 – – – – – – –
Liu & Pang 2019 – – – 3390 0.000 – – –
Soubiran et al. 2018 4.17 – – – – – – –
Cantat-Gaudin et al. 2018 4.17 – – – – – – –
Loktin & Popova 2017 4.88 0.19 – 1076 – – – –
Kharchenko et al. 2016 4.45 0.20 – 1365 – – – –
Netopil et al. 2016 10.51 – – 3230 – – – –
Kharchenko et al. 2013 4.45 0.20 – 1365 -0.490 – – –
Gozha et al. 2012 4.46 – – 1076 -0.490 – – –
Bukowiecki et al. 2011 4.45(1) 0.00 – 1413 – – – –
Paunzen et al. 2010 – – – – -0.570 – – –
Ahumada & Lapasset 2007 – 0.16 – 1072 – – – 9
van den Bergh 2006 4.46 0.16 – 1072 – – – –
Chen et al. 2003 4.46 0.16 – 1070 -0.440(1) – – –
Dias et al. 2002 4.46 0.16 – 1076 -0.420 – – –
Lynga 1987 3.58 0.00 – 6026 -0.550 – – –

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization
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NGC 2243 UCC
NGC 2243 HUNT23
NGC 2243 CANTAT20
Galactocentric position diagram