NGC 4103

(Melotte 109; Collinder 252; VDBH 127; MWSC 1997; OCL 871; vdBergh-Hagen 127; ESO 130 05; FoF 420)

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0.96 UTI
0.82
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 292
Core radius and density 1.0 [pc], 14 [pc-2]
C3 classification AA
  • CN 0.82 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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
NGC 4103 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 288 along with Theia_2119.

Palma et al. (2025)
Classified as genetic pair P237, along with Theia_2119.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 1.00 (50th percentile), true positive (human-assigned).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1988, e_all=0.0717.

Rain et al. (2021)
This cluster was include in (Dias et al., 2002A&A...389..871D, Cat. B/ocl) however, parameters log(t)=7.436, Av=0.994, [Fe/H]= 0.00 were taken from Bossini et al. (2019A&A...623A.108B, Cat. J/A+A/623/A108). The distance d=1660.8 (dmode+01) of Cantat-Gaudin et al. (2018A&A...618A..93C, Cat. J/A+A18/A93) was use to fit the isochrone.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg37' along with Gulliver 12.

Ahumada & Lapasset (2007)
All cluster parameters are from (2005, unpublished data).

Data
πŸ” Search references for NGC 4103 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 181.65 -61.244 0.488 -6.198 0.154 -24.485
Wei et al. 2025 181.612 -61.239 0.502 -6.186 0.173 –
Almeida et al. 2025 181.603 -61.249 – – – –
Hunt & Reffert 2024 181.656 -61.247 0.493 -6.207 0.185 -33.543
Celli et al. 2024 181.628 -61.245 – – – –
Cavallo et al. 2024 181.642 -61.244 0.494 – – –
Hunt & Reffert 2023 181.656 -61.247 0.493 -6.207 0.185 -33.543
Just et al. 2023 181.656 -61.246 – – – –
Jaehnig et al. 2021 181.639 -61.243 0.495 -6.209 0.144 –
Rain et al. 2021 181.628 -61.245 0.473 -6.184 0.075 –
Dias et al. 2021 181.603 -61.249 0.473 -6.19 0.088 -24.863
Cantat-Gaudin et al. 2020 181.628 -61.245 0.473 -6.184 0.075 –
SΓ‘nchez et al. 2020 181.667 -61.25 – -6.141 0.115 –
Cantat-Gaudin & Anders 2020 181.628 -61.245 0.473 -6.184 0.075 –
Liu & Pang 2019 181.634 -61.249 0.473 -6.215 0.15 –
Bossini et al. 2019 181.628 -61.245 – – – –
Bica et al. 2019 181.657 -61.254 – – – –
Cantat-Gaudin et al. 2018 181.628 -61.245 0.473 -6.184 0.075 –
Dias et al. 2018 – – – -7.18 -0.71 –
Dib et al. 2018 181.665 -61.25 – – – –
Loktin & Popova 2017 181.665 -61.25 – -3.568 1.282 -12.0
Sampedro et al. 2017 181.667 -61.25 – -4.34 -0.58 –
Joshi et al. 2016 181.665 -61.25 – – – –
Kharchenko et al. 2016 181.656 -61.246 – – – –
Dias et al. 2014 181.667 -61.25 – -4.57 0.18 –
Kharchenko et al. 2013 181.665 -61.25 – -5.42 0.98 -12.0
Gozha et al. 2012 181.667 -61.25 – – – –
Bukowiecki et al. 2011 181.704 -61.232 – – – –
Piskunov et al. 2008 181.661 -61.245 – – – –
Kharchenko et al. 2007 181.66 -61.25 – 0.23 – -12.0
Ahumada & Lapasset 2007 181.675 -61.25 – – – –
van den Bergh 2006 181.678 -61.256 – – – –
Kharchenko et al. 2005 181.66 -61.25 – -5.04 -0.95 -12.0
Kharchenko et al. 2003 181.68 -61.25 – -5.01 -0.91 –
Dias et al. 2002 181.667 -61.25 – -7.3 -0.13 -12.0
Dambis 1999 181.678 -61.256 – – – –
Lynga 1987 181.665 -61.235 – – – –
van den Bergh & Hagen 1975 181.025 -60.967 – – – –
Sulentic et al. 1973 181.677 -61.239 – – – –

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– 1.865 0.94 1.165 29 0.000 1400 0.39 0
Liu et al. 2025 2.90 0.37 – 28 – – – –
Wei et al. 2025 2.59 1.43 – 26 -0.500 1564 0.39 –
Almeida et al. 2025 1.87 1.10 – 29 – 1316 – –
Hunt & Reffert 2024 1.89 0.90 1.16 30 – 2143(1) – –
Celli et al. 2024 – – – 21 – 1483 – –
Cavallo et al. 2024 1.83 1.04 – 31 0.020 – – –
Hunt & Reffert 2023 1.89 0.90 1.17 30 – – – –
Just et al. 2023 – – – 57 – 366 – –
Jaehnig et al. 2021 2.03(1) – – – – – – –
Rain et al. 2021 1.99 0.91 – 27 – – – 0
Dias et al. 2021 1.87 1.10 – 29 0.128 – – –
Cantat-Gaudin et al. 2020 2.06 0.85 – 21 – – – –
Kounkel et al. 2020 1.95 0.95 – 48 – – – –
Cantat-Gaudin & Anders 2020 1.99 – – – – – – –
Liu & Pang 2019 – – – 83 0.500 – – –
Bossini et al. 2019 1.92 0.99 – 27 0.000 – – –
Cantat-Gaudin et al. 2018 1.99 – – – – – – –
Dib et al. 2018 1.66 – – 57 – – – –
Loktin & Popova 2017 1.67 0.86 – 29 – – – –
Joshi et al. 2016 1.66 0.95 – 57 – 1175 – –
Kharchenko et al. 2016 1.66 0.95 – 57 – – – –
Kharchenko et al. 2013 1.66 0.95 – 57 – – – –
Bukowiecki et al. 2012 – – – – – 1570 – –
Gozha et al. 2012 1.63 – – 25 -0.470 1175 – –
Bukowiecki et al. 2011 1.90(1) 1.07 – 32 – – – –
Paunzen et al. 2010 – – – – -0.470 – – –
Piskunov et al. 2008 1.66 0.88 – 39 – – – –
Ahumada & Lapasset 2007 – 1.07 – 20 – – – 0
van den Bergh 2006 1.63 0.91 – 25 – – – –
Kharchenko et al. 2005 1.66 0.88 – 39 – – – –
Kharchenko et al. 2003 1.63 0.91 – – – – – –
Dias et al. 2002 1.63 0.93 – 25 – – – –
Dambis 1999 1.77 0.97 – 25 – – – –
Lynga 1987 1.86 0.85 – 22 – – – –

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

Visualization
ℹ️
NGC 4103 UCC
NGC 4103 HUNT23
NGC 4103 CANTAT20
Galactocentric position diagram