Melotte 77

(Collinder 163; NGC 2455; MWSC 1350; OCL 636; ESO 560 15; FoF 381)

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0.91 UTI
0.81
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 270
Stellar density (N50/rad) 6.5 [N/pc2]
C3 classification AB
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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
Melotte 77 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Melotte 77 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 117.292 -21.295 0.302 -2.736 2.736 68.874
Li et al. 2025 117.284 -21.298 0.294 -2.76 2.712 –
Almeida et al. 2025 117.276 -21.305 – – – –
Hunt & Reffert 2024 117.297 -21.291 0.302 -2.714 2.749 77.944
Cavallo et al. 2024 117.285 -21.298 0.305 – – –
Hunt & Reffert 2023 117.297 -21.291 0.302 -2.714 2.749 77.944
Just et al. 2023 117.252 -21.289 – – – –
Dias et al. 2021 117.276 -21.305 0.297 -2.757 2.701 68.964
Cantat-Gaudin et al. 2020 117.284 -21.298 0.294 -2.76 2.712 –
SΓ‘nchez et al. 2020 117.254 -21.302 – -2.807 2.802 –
Cantat-Gaudin & Anders 2020 117.284 -21.298 0.294 -2.76 2.712 –
Liu & Pang 2019 117.313 -21.321 0.284 -2.611 2.681 –
Soubiran et al. 2018 117.284 -21.298 – – – 69.07
Bica et al. 2019 117.257 -21.307 – – – –
Cantat-Gaudin et al. 2018 117.284 -21.298 0.294 -2.76 2.712 –
Loktin & Popova 2017 117.255 -21.299 – -6.124 3.167 –
Kharchenko et al. 2016 117.252 -21.289 – – – –
Dias et al. 2014 117.254 -21.302 – -5.31 -0.41 –
Kharchenko et al. 2013 117.258 -21.292 – -5.55 3.2 –
Dias et al. 2002 117.254 -21.302 – -5.31 -0.41 –

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– 2.79 0.67 1.34 508 0.098 562 – –
Li et al. 2025 2.75 0.74 – 535 -0.055 – – –
Almeida et al. 2025 2.55 1.07 – 345 – 562 – –
Hunt & Reffert 2024 – – – – – 1397(1) – –
Cavallo et al. 2024 2.87 0.72 – 490 0.360 – – –
Hunt & Reffert 2023 2.79 0.40 1.34 604 – – – –
Just et al. 2023 – – – 525 – 83 – –
Dias et al. 2021 2.55 1.07 – 345 -0.222 – – –
Cantat-Gaudin et al. 2020 3.09 0.62 – 324 – – – –
Cantat-Gaudin & Anders 2020 3.09 – – – – – – –
Liu & Pang 2019 – – – 525 0.250 – – –
Soubiran et al. 2018 3.09 – – – – – – –
Cantat-Gaudin et al. 2018 3.09 – – – – – – –
Loktin & Popova 2017 4.33 0.30 – 380 – – – –
Kharchenko et al. 2016 1.71 0.32 – 525 – – – –
Kharchenko et al. 2013 1.71 0.32 – 525 – – – –
Dias et al. 2002 2.65 1.67 – 182 – – – –

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

Visualization
ℹ️
Melotte 77 UCC
Melotte 77 HUNT23
Melotte 77 CANTAT20
Galactocentric position diagram