NGC 103

(Collinder 1; MWSC 40; OCL 291; FSR 0491)

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0.97 UTI
0.84
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 343
Core radius and density 1.9 [pc], 8.3 [pc-2]
C3 classification AA
  • CN 0.84 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 103 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is very well-studied in the literature.

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

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).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2479, e_all=0.1302.

Ahumada & Lapasset (2007)
Star 29 appears as a blue straggler in the diagrams of (1960AAHam...5..215H), but it is located at about five cluster radii from the centre to the west.

Data
πŸ” Search references for NGC 103 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 6.309 61.327 0.283 -2.81 -1.059 -77.089
Li et al. 2025 6.312 61.326 0.288 -2.823 -0.988 –
Almeida et al. 2025 6.321 61.327 – – – –
Hunt & Reffert 2024 6.311 61.326 0.286 -2.815 -1.066 -75.123
Cavallo et al. 2024 6.336 61.325 0.284 – – –
Hunt & Reffert 2023 6.311 61.326 0.286 -2.815 -1.066 -75.123
Almeida et al. 2023 6.319 61.325 – – – –
Just et al. 2023 6.26 61.337 – – – –
Jaehnig et al. 2021 6.312 61.325 0.325 -2.827 -1.001 –
Rain et al. 2021 6.312 61.326 0.288 -2.823 -0.988 –
Dias et al. 2021 6.321 61.327 0.289 -2.829 -0.978 -78.897
Cantat-Gaudin et al. 2020 6.312 61.326 0.288 -2.823 -0.988 –
SΓ‘nchez et al. 2020 6.317 61.323 – -3.162 -1.027 –
Cantat-Gaudin & Anders 2020 6.312 61.326 0.288 -2.823 -0.988 –
Soubiran et al. 2018 6.312 61.326 – – – -78.11
Bica et al. 2019 6.324 61.323 – – – –
Cantat-Gaudin et al. 2018 6.312 61.326 0.288 -2.823 -0.988 –
Dias et al. 2018 – – – -2.33 0.08 –
Loktin & Popova 2017 6.315 61.323 – -1.195 -2.138 -116.7
Sampedro et al. 2017 6.317 61.323 – -2.29 -0.16 –
Kharchenko et al. 2016 6.26 61.337 – – – –
Dias et al. 2014 6.317 61.323 – -3.44 -0.32 –
Kharchenko et al. 2013 6.27 61.34 – -2.49 -3.62 -116.7
Gozha et al. 2012 6.317 61.323 – – – –
Kharchenko et al. 2012 6.27 61.34 – -2.49 -3.62 -116.7
Bukowiecki et al. 2011 6.304 61.344 – – – –
Kharchenko et al. 2007 6.31 61.32 – 0.03 – –
Ahumada & Lapasset 2007 6.3 61.317 – – – –
van den Bergh 2006 6.325 61.35 – – – –
Dias et al. 2002 6.317 61.323 – -3.44 -0.32 -116.7
Dambis 1999 6.325 61.35 – – – –
Lynga 1987 6.322 61.333 – – – –
Sulentic et al. 1973 6.323 61.338 – – – –

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– 3.03 1.42 1.37 134 -0.131 1164 0.58 0
Li et al. 2025 3.25 1.59 – 112 0.056 – – –
Almeida et al. 2025 2.90 1.69 – 107 – 1231 – –
Hunt & Reffert 2024 3.09 1.40 1.37 195 – 2266(1) – –
Cavallo et al. 2024 2.83 1.51 – 282 0.070 – – –
Hunt & Reffert 2023 3.09 1.41 1.37 195 – – – –
Almeida et al. 2023 2.98 1.72 – 99 -0.123 841(1) 0.58 –
Just et al. 2023 – – – 367 – 34 – –
Jaehnig et al. 2021 3.11(1) – – – – – – –
Rain et al. 2021 3.16 1.26 – 132 – – – 0
Dias et al. 2021 2.90 1.69 – 107 -0.138 – – –
Cantat-Gaudin et al. 2020 3.16 1.08 – 102 – – – –
Kounkel et al. 2020 3.10 1.61 – 166 – – – –
Cantat-Gaudin & Anders 2020 3.16 – – – – – – –
Soubiran et al. 2018 3.16 – – – – – – –
Cantat-Gaudin et al. 2018 3.16 – – – – – – –
Loktin & Popova 2017 3.00 1.26 – 134 – – – –
Kharchenko et al. 2016 2.50 1.42 – 367 – – – –
Kharchenko et al. 2013 2.50 1.42 – 367 – – – –
Bukowiecki et al. 2012 – – – – – 1164 – –
Gozha et al. 2012 3.03 – – 134 -0.850 – – –
Kharchenko et al. 2012 2.50 1.42 – 367 – – – –
Bukowiecki et al. 2011 3.52(1) 1.77 – 112 – – – –
Paunzen et al. 2010 – – – – -0.850 – – –
Ahumada & Lapasset 2007 – 1.29 – 135 – – – 0
van den Bergh 2006 3.03 1.29 – 135 – – – –
Dias et al. 2002 3.03 1.28 – 134 – – – –
Dambis 1999 2.75 1.74 – 28 – – – –
Lynga 1987 3.00 1.70 – 38 – – – –

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

Visualization
ℹ️
NGC 103 UCC
NGC 103 HUNT23
NGC 103 CANTAT20
Galactocentric position diagram