NGC 4439

(MWSC 2035)

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0.88 UTI
0.67
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 84
Stellar density (N50/rad) 12.3 [N/pc2]
C3 classification AB
  • CN 0.67 Moderately populated
  • 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 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
NGC 4439 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

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

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

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.778, Av=1.064, [Fe/H]=0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). The distance d=1657.6 (dmode+01) of Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93) was use to fit the isochrone.

Ahumada & Lapasset (2007)
The apparent cluster diameter is from (1973A&AS...10..135M).

Data
🔍 Search references for NGC 4439 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 187.115 -60.096 0.501 -7.124 -0.432 -24.978
Li et al. 2025 187.119 -60.097 0.474 -7.089 -0.413 –
Almeida et al. 2025 187.121 -60.098 – – – –
Hunt & Reffert 2024 187.111 -60.097 0.499 -7.175 -0.434 -19.882
Cavallo et al. 2024 187.102 -60.092 0.501 – – –
Hunt & Reffert 2023 187.111 -60.097 0.499 -7.175 -0.434 -19.882
Almeida et al. 2023 187.121 -60.102 – – – –
Just et al. 2023 187.108 -60.107 – – – –
Jaehnig et al. 2021 187.105 -60.109 0.512 -7.116 -0.461 –
Rain et al. 2021 187.119 -60.097 0.474 -7.089 -0.413 –
Dias et al. 2021 187.121 -60.098 0.473 -7.054 -0.374 –
Cantat-Gaudin et al. 2020 187.119 -60.097 0.474 -7.089 -0.413 –
Cantat-Gaudin & Anders 2020 187.119 -60.097 0.474 -7.089 -0.413 –
Bossini et al. 2019 187.119 -60.097 – – – –
Cantat-Gaudin et al. 2018 187.119 -60.097 0.474 -7.089 -0.413 –
Dias et al. 2018 – – – -7.57 -0.98 –
Dib et al. 2018 187.117 -60.11 – – – –
Loktin & Popova 2017 187.11 -60.105 – -12.942 -5.335 –
Sampedro et al. 2017 187.113 -60.105 -4.99 -2.59 – –
Joshi et al. 2016 187.117 -60.11 – – – –
Kharchenko et al. 2016 187.108 -60.107 – – – –
Dias et al. 2014 187.112 -60.105 – -4.92 -2.78 –
Kharchenko et al. 2013 187.117 -60.11 – -11.4 -4.73 –
Piskunov et al. 2008 187.098 -60.093 – – – –
Ahumada & Lapasset 2007 187.1 -60.1 – – – –
van den Bergh 2006 187.1 -60.1 – – – –
Kharchenko et al. 2005 187.11 -60.1 – -10.8 -5.04 –
Kharchenko et al. 2003 187.11 -60.1 – -12.18 -6.63 –
Dias et al. 2002 187.113 -60.105 – -10.49 -0.85 –
Dambis 1999 187.1 -60.1 – – – –
Lynga 1987 187.12 -60.084 – – – –
van den Bergh & Hagen 1975 186.4 -59.817 – – – –
Sulentic et al. 1973 187.05 -60.088 – – – –

💡 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– 1.78 1.1 0.7 53 0.000 282 0.53 0
Li et al. 2025 1.67 1.14 – 58 -0.049 – – –
Almeida et al. 2025 1.79 1.25 – 51 – 297 – –
Hunt & Reffert 2024 – – – – – 473(1) – –
Cavallo et al. 2024 1.76 1.40 – 39 -0.130 – – –
Hunt & Reffert 2023 1.82 0.97 0.70 94 – – – –
Almeida et al. 2023 1.78 1.23 – 53 0.055 282(1) 0.53 –
Just et al. 2023 – – – 51 – 203 – –
Jaehnig et al. 2021 1.98(1) – – – – – – –
Rain et al. 2021 1.99 1.07 – 59 – – – 0
Dias et al. 2021 1.79 1.25 – 51 0.019 – – –
Cantat-Gaudin et al. 2020 2.01 0.99 – 52 – – – –
Kounkel et al. 2020 2.09 1.30 – 60 – – – –
Cantat-Gaudin & Anders 2020 1.99 – – – – – – –
Bossini et al. 2019 2.05 1.06 – 60 0.000 – – –
Cantat-Gaudin et al. 2018 1.99 – – – – – – –
Dib et al. 2018 1.66 – – 51 – – – –
Loktin & Popova 2017 1.81 1.11 – 74 – – – –
Joshi et al. 2016 1.66 0.98 – 51 – 19 – –
Kharchenko et al. 2016 1.66 0.98 – 51 – – – –
Kharchenko et al. 2013 1.66 0.98 – 51 – – – –
Piskunov et al. 2008 1.78 1.10 – 51 – – – –
Ahumada & Lapasset 2007 – 1.10 – 81 – – – 0
van den Bergh 2006 1.78 1.10 – 81 – – – –
Kharchenko et al. 2005 1.78 1.10 – 51 – – – –
Kharchenko et al. 2003 1.78 1.10 – – – – – –
Dias et al. 2002 1.78 1.10 – 81 – – – –
Dambis 1999 1.56 1.06 – 63 – – – –
Lynga 1987 1.60 0.98 – 63 – – – –

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

Visualization
ℹī¸
NGC 4439 UCC
NGC 4439 HUNT23
NGC 4439 CANTAT20
Galactocentric position diagram