Mamajek 4

(MWSC 2914; Alessi 71; OCSN 217)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 119
Radius (P>50% members) 35.0 [arcmin]
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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¸
Mamajek 4 is a rich, very dense object of high C3 quality. Its parallax locates it at a very 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.
Very close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Mamajek 4 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 276.574 -50.76 2.23 4.598 -21.066 -29.314
Li et al. 2025 276.635 -50.772 2.224 4.646 -21.051 –
Almeida et al. 2025 276.644 -50.879 – – – –
Alfonso et al. 2024 276.203 -50.986 2.183 4.422 -21.294 –
Hunt & Reffert 2024 276.371 -50.637 2.219 3.659 -21.67 -29.69
Cavallo et al. 2024 274.531 -52.302 2.221 – – –
Hunt & Reffert 2023 276.371 -50.637 2.219 3.659 -21.67 -29.69
Almeida et al. 2023 276.394 -50.831 – – – –
Qin et al. 2023 276.58 -50.71 2.23 4.06 -21.71 -28.65
Just et al. 2023 276.521 -50.956 – – – –
He et al. 2022 276.567 -50.608 2.222 4.625 -20.897 –
Tarricq et al. 2022 276.808 -50.76 2.217 4.424 -21.421 –
Dias et al. 2021 276.644 -50.879 2.227 4.639 -21.015 -27.42
Cantat-Gaudin et al. 2020 276.635 -50.772 2.224 4.646 -21.051 –
Cantat-Gaudin & Anders 2020 276.635 -50.772 2.224 4.646 -21.051 –
Bossini et al. 2019 276.635 -50.772 – – – –
Soubiran et al. 2018 276.635 -50.772 – – – -26.32
Bica et al. 2019 276.506 -50.998 – – – –
Cantat-Gaudin et al. 2018 276.635 -50.772 2.224 4.646 -21.051 –
Kharchenko et al. 2016 276.521 -50.956 – – – –
Dias et al. 2014 276.5 -51.0 – -1.01 -4.01 –
Kharchenko et al. 2013 276.532 -50.955 – 3.9 -19.2 -43.4
Gozha et al. 2012 276.5 -51.0 – – – –
Dias et al. 2002 276.5 -51.0 – 4.4 -19.4 -43.4

💡 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 0.49 0.22 – 595 0.253 – – –
Almeida et al. 2025 0.44 0.21 – 703 – 167 – –
Alfonso et al. 2024 0.46 0.31 – 541 0.049 – – –
Hunt & Reffert 2024 – – – – – 114* – –
Cavallo et al. 2024 0.45 0.39 – 339 0.480 – – –
Hunt & Reffert 2023 0.43 0.20 0.85 312 – – – –
Almeida et al. 2023 0.44 0.34 – 592 -0.006 506* 0.58 –
Qin et al. 2023 0.53 0.40 – 794 – – – –
Just et al. 2023 – – – 653 – 20 – –
He et al. 2022 – 0.55 – 79 – – – –
Tarricq et al. 2022 0.45 – – 372 – – – –
Dias et al. 2021 0.44 0.21 – 703 0.049 – – –
Cantat-Gaudin et al. 2020 0.46 0.31 – 372 – – – –
Cantat-Gaudin & Anders 2020 0.44 – – – – – – –
Bossini et al. 2019 0.40 0.20 – 667 0.000 – – –
Soubiran et al. 2018 0.44 – – – – – – –
Cantat-Gaudin et al. 2018 0.44 – – – – – – –
Kharchenko et al. 2016 0.39 0.16 – 653 – – – –
Kharchenko et al. 2013 0.39 0.16 – 653 – – – –
Gozha et al. 2012 0.39 – – 631 – – – –
Dias et al. 2002 0.39 0.16 – 631 – – – –

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

Visualization
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Mamajek 4 UCC
Mamajek 4 HUNT23
Mamajek 4 CANTAT20
Galactocentric position diagram