Melotte 236

(Collinder 438; NGC 7092; MWSC 3521; M 39; OCL 211; OCSN 243)

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0.97 UTI
0.83
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 313
Stellar density (N50/rad) 15.9 [N/pc2]
C3 classification AA
  • CN 0.83 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¸
Melotte 236 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near 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 absorption and age parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.

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

Data
🔍 Search references for Melotte 236 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 322.801 48.252 3.36 -7.45 -19.733 -5.943
Li et al. 2025 322.889 48.247 3.337 -7.477 -19.738 –
Almeida et al. 2025 322.757 48.228 – – – –
Alfonso et al. 2024 322.338 48.024 3.312 -7.316 -19.622 –
Almeida et al. 2023 322.818 48.264 – – – –
Qin et al. 2023 322.9 48.4 3.38 -7.5 -19.8 -6.4
He et al. 2022 322.81 48.327 3.367 -7.466 -19.786 –
Tarricq et al. 2022 323.052 48.23 3.354 -7.4 -19.771 –
Jaehnig et al. 2021 323.07 48.305 3.385 -7.581 -19.72 –
Rain et al. 2021 322.889 48.247 3.337 -7.477 -19.738 –
Dias et al. 2021 322.757 48.228 3.344 -7.473 -19.732 -5.202
Cantat-Gaudin et al. 2020 322.889 48.247 3.337 -7.477 -19.738 –
Cantat-Gaudin & Anders 2020 322.889 48.247 3.337 -7.477 -19.738 –
Bossini et al. 2019 322.889 48.247 – – – –
Soubiran et al. 2018 322.889 48.247 – – – -5.09
Bica et al. 2019 322.999 48.439 – – – –
Cantat-Gaudin et al. 2018 322.889 48.247 3.337 -7.477 -19.738 –
Yen et al. 2018 323.025 48.451 3.33 -7.54 -20.13 –
Loktin & Popova 2017 322.95 48.433 – -7.9 -20.1 -8.6
Dias et al. 2014 322.95 48.433 – -2.36 -2.09 –
Gozha et al. 2012 322.95 48.434 – – – –
Piskunov et al. 2008 322.946 48.447 – – – –
Kharchenko et al. 2007 322.95 48.43 – 0.88 – -6.79
Piskunov et al. 2007 322.946 48.447 – – – –
van den Bergh 2006 322.95 48.45 – – – –
Kharchenko et al. 2005 322.95 48.45 – -8.0 -20.21 -2.8
Kharchenko et al. 2003 323.04 48.45 – -7.36 -20.67 –
Chen et al. 2003 323.117 48.457 – -8.0 -19.71 -7.5
Dias et al. 2002 322.95 48.433 – -7.9 -20.1 -5.26

💡 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– 0.31 0.03 – 370 0.010 186 0.38 0.0
Li et al. 2025 0.33 0.00 – 415 0.251 – – –
Almeida et al. 2025 0.30 0.09 – 457 – 162 – –
Alfonso et al. 2024 0.31 0.00 – 704 -0.046 – – –
Almeida et al. 2023 0.33 0.05 – 367 0.179 331(1) 0.38 –
Qin et al. 2023 0.35 0.31 – 112 – – – –
He et al. 2022 – 0.40 – 126 – – – –
Tarricq et al. 2022 0.31 – – 398 – – – –
Jaehnig et al. 2021 0.29(1) – – – – – – –
Rain et al. 2021 0.30 0.03 – 309 – – – 0
Dias et al. 2021 0.30 0.09 – 457 -0.047 – – –
Cantat-Gaudin et al. 2020 0.31 0.00 – 398 – – – –
Cantat-Gaudin & Anders 2020 0.30 – – – – – – –
Bossini et al. 2019 0.28 0.05 – 310 0.000 – – –
Soubiran et al. 2018 0.30 – – – – – – –
Cantat-Gaudin et al. 2018 0.30 – – – – – – –
Yen et al. 2018 0.29 0.03 – 501 – – – –
Loktin & Popova 2017 0.32 0.04 – 279 – – – –
Gozha et al. 2012 0.33 – – 279 0.150 186 – –
Piskunov et al. 2008 0.31 0.03 – 372 – 232(1) – –
Piskunov et al. 2007 0.31 0.03 – 372 – 112 – –
van den Bergh 2006 0.33 0.03 – 275 – – – –
Kharchenko et al. 2005 0.31 0.03 – 372 – – – –
Kharchenko et al. 2003 0.31 0.03 – – – – – –
Chen et al. 2003 0.33 – – 270 – – – –
Dias et al. 2002 0.33 0.04 – 279 0.010 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
Theia 517 100.0 322.8 48.25 3.36 -7.45 -19.74 -6.07 0.07
CWWDL 14690 17.3 322.87 48.25 3.4 -7.49 -19.96 -6.46 0.0
CWWDL 14621 14.4 323.03 48.3 3.38 -7.6 -19.9 -6.53 0.0

💡 Note: The % column shows the percentage of members that Melotte 236 shares with each listed object.

Visualization
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Melotte 236 UCC
Melotte 236 CANTAT20
Galactocentric position diagram