NGC 1931

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0.72 UTI
0.68
CN
1.0
Cdens
0.75
CC3
0.58
Clit
1.0
Cdup
Nm (P>50%) 85
Core radius and density 0.7 [pc], 18 [pc-2]
C3 classification AB
  • CN 0.68 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.58 Moderately 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 1931 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Cavallo et al. (2024)
Bronze sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.56 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.56 (50th percentile).

Data
πŸ” Search references for NGC 1931 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 82.851 34.226 0.436 0.216 -2.028 -20.833
Hunt & Reffert 2024 82.852 34.224 0.424 0.237 -2.036 -20.834
Cavallo et al. 2024 82.843 34.224 0.425 – – –
Hunt & Reffert 2023 82.852 34.224 0.424 0.237 -2.036 -20.834
Jaehnig et al. 2021 82.804 34.238 0.455 0.302 -1.935 –
SΓ‘nchez et al. 2020 82.854 34.245 – 0.384 -1.813 –
Dias et al. 2018 – – – 2.17 -2.46 –
Loktin & Popova 2017 82.86 34.245 – -0.011 -1.655 –
Sampedro et al. 2017 82.854 34.245 – -0.42 -3.19 –
Dias et al. 2014 82.854 34.245 – -0.29 -3.48 –
Gozha et al. 2012 82.854 34.245 – – – –
Bukowiecki et al. 2011 82.854 34.189 – – – –
Glushkova et al. 2010 82.858 34.214 – – – –
Ahumada & Lapasset 2007 82.85 34.25 – – – –
van den Bergh 2006 82.861 34.249 – – – –
Dias et al. 2002 82.854 34.245 – -0.29 -3.48 –
Dambis 1999 82.861 34.249 – – – –
Lynga 1987 82.854 34.242 – – – –
Sulentic et al. 1973 82.865 34.251 – – – –

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– 2.19 2.125 2.45 10 -0.060 491 – 0
Hunt & Reffert 2024 2.12 1.92 2.45 12 – 459(1) – –
Cavallo et al. 2024 1.98 1.11 – 83 0.260 – – –
Hunt & Reffert 2023 2.12 1.92 2.45 12 – – – –
Jaehnig et al. 2021 2.26(1) – – – – – – –
Loktin & Popova 2017 3.07 2.33 – 10 – – – –
Bukowiecki et al. 2012 – – – – – 523 – –
Gozha et al. 2012 3.09 – – 10 -0.060 – – –
Bukowiecki et al. 2011 0.88(1) 1.83 – 8 – – – –
Paunzen et al. 2010 – – – – -0.060 – – –
Glushkova et al. 2010 1.00 6.21 – 10 – – – –
Ahumada & Lapasset 2007 – 2.33 – 10 – – – 0
van den Bergh 2006 3.09 2.33 – 10 – – – –
Dias et al. 2002 2.30 2.33 – 2 – – – –
Dambis 1999 2.19 1.71 – 13 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWNU 3181 90.6 82.85 34.22 0.45 0.21 -2.0 -20.83 0.06

πŸ’‘ Note: The % column shows the percentage of members that NGC 1931 shares with each listed object.

Visualization
ℹ️
NGC 1931 UCC
NGC 1931 HUNT23
Galactocentric position diagram