Ruprecht 123

(MWSC 2584)

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0.27 UTI
0.0
CN
0.02
Cdens
0.12
CC3
0.61
Clit
1.0
Cdup
Nm (P>50%) 17
Core radius and density 6.7 [pc], 0.1 [pc-2]
C3 classification DC
  • CN 0.0 Sparse
  • Cdens 0.02 Very loose
  • CC3 0.12 Very low quality
  • Clit 0.61 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
Ruprecht 123 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.97 (50th percentile), true positive (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.97 (50th percentile), true positive (human-assigned).

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: exposed cluster, without submm emission.

Data
πŸ” Search references for Ruprecht 123 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 260.798 -37.939 0.533 1.238 -0.572 -19.953
Li et al. 2025 260.781 -37.898 0.604 1.044 0.922 –
Almeida et al. 2025 260.781 -37.898 – – – –
Hunt & Reffert 2024 260.86 -37.916 0.653 1.672 -2.056 -20.683
Cavallo et al. 2024 260.868 -37.905 0.654 – – –
He et al. 2023 260.855 -37.909 0.658 1.699 -2.034 –
Hunt & Reffert 2023 260.86 -37.916 0.653 1.672 -2.056 -20.683
Just et al. 2023 260.871 -37.925 – – – –
Dias et al. 2021 260.781 -37.898 0.604 1.044 0.922 –
SΓ‘nchez et al. 2020 260.858 -37.9 – 1.233 -1.963 –
Monteiro & Dias 2019 260.88 -37.925 – 1.03 0.888 3.055
Dias et al. 2018 – – – -0.63 -2.55 –
Dib et al. 2018 260.88 -37.925 – – – –
Sampedro et al. 2017 260.858 -37.9 – -1.03 -3.71 –
Joshi et al. 2016 260.88 -37.925 – – – –
Kharchenko et al. 2016 260.871 -37.925 – – – –
Dias et al. 2014 260.858 -37.9 – -0.79 -3.15 –
Kharchenko et al. 2013 260.88 -37.925 – 0.65 -2.0 –
Morales et al. 2013 260.858 -37.9 – – – –
Kharchenko et al. 2003 260.85 -37.96 – -2.49 -0.02 –
Dias et al. 2002 260.858 -37.9 – -0.79 -3.15 –
Lynga 1987 260.858 -37.928 – – – –

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– 1.45 1.64 1.13 129 0.174 76 – –
Li et al. 2025 1.55 1.87 – 516 0.160 – – –
Almeida et al. 2025 1.51 1.91 – 481 – 76 – –
Hunt & Reffert 2024 1.45 1.77 1.13 241 – 321(1) – –
Cavallo et al. 2024 1.47 1.64 – 129 0.280 – – –
He et al. 2023 1.45 2.00 – 32 – – – –
Hunt & Reffert 2023 1.45 1.77 1.13 242 – – – –
Just et al. 2023 – – – 126 – 60 – –
Dias et al. 2021 1.51 1.91 – 481 0.188 – – –
Monteiro & Dias 2019 1.72 1.49 – 612 0.020 – – –
Dib et al. 2018 0.93 – – 126 – – – –
Joshi et al. 2016 0.93 0.59 – 126 – – – –
Kharchenko et al. 2016 0.93 0.59 – 126 – – – –
Kharchenko et al. 2013 0.93 0.59 – 126 – – – –
Morales et al. 2013 0.71 – – – – – – –
Kharchenko et al. 2003 0.71 0.63 – – – – – –
Dias et al. 2002 0.71 0.63 – – – – – –

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

Visualization
ℹ️
Ruprecht 123 UCC
Ruprecht 123 HUNT23
Galactocentric position diagram