Ruprecht 28

(MWSC 1299; FoF 686)

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0.79 UTI
0.83
CN
0.86
Cdens
0.75
CC3
0.74
Clit
1.0
Cdup
Nm (P>50%) 316
Core radius and density 2.4 [pc], 4.3 [pc-2]
C3 classification AB
  • CN 0.83 Rich
  • Cdens 0.86 Dense
  • CC3 0.75 High quality
  • Clit 0.74 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 28 is a rich, dense object of 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, old cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is moderately studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst 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=0.1249, e_all=0.0796.

Data
πŸ” Search references for Ruprecht 28 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 114.897 -30.935 0.225 -2.554 3.816 91.135
Li et al. 2025 114.9 -30.933 0.198 -2.567 3.854 –
Hu & Soubiran 2025 114.891 -30.917 – – – –
Almeida et al. 2025 114.901 -30.931 – – – –
Hunt & Reffert 2024 114.904 -30.935 0.218 -2.566 3.806 91.367
Cavallo et al. 2024 114.891 -30.917 0.219 – – –
Hunt & Reffert 2023 114.904 -30.935 0.218 -2.566 3.806 91.367
Almeida et al. 2023 114.897 -30.93 – – – –
Just et al. 2023 114.895 -30.932 – – – –
Jadhav & Subramaniam 2021 114.9 -30.933 – – – –
Dias et al. 2021 114.901 -30.931 0.197 -2.564 3.89 89.241
Cantat-Gaudin et al. 2020 114.9 -30.933 0.198 -2.567 3.854 –
SΓ‘nchez et al. 2020 114.9 -30.933 – -2.549 3.892 –
Cantat-Gaudin & Anders 2020 114.9 -30.933 0.198 -2.567 3.854 –
Liu & Pang 2019 114.888 -30.905 0.242 -2.501 3.578 –
Soubiran et al. 2018 114.9 -30.933 – – – 89.55
Cantat-Gaudin et al. 2018 114.9 -30.933 0.198 -2.567 3.854 –
Dias et al. 2018 – – – -3.01 2.6 –
Loktin & Popova 2017 114.9 -30.936 – -1.586 1.408 –
Sampedro et al. 2017 114.9 -30.933 – -3.46 2.83 –
Kharchenko et al. 2016 114.895 -30.932 – – – –
Dias et al. 2014 114.9 -30.933 – -2.84 2.31 –
Kharchenko et al. 2013 114.9 -30.935 – -3.01 0.44 –
Bukowiecki et al. 2011 114.883 -30.938 – – – –
Lynga 1987 114.859 -30.933 – – – –

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– 4.205 1.15 0.62 1175 -0.197 1031 0.78 2
Li et al. 2025 4.16 1.15 – 1904 -0.247 – – –
Hu & Soubiran 2025 – – – – -0.170(5) – – –
Almeida et al. 2025 3.71 1.41 – 1667 – 1031 – –
Hunt & Reffert 2024 4.08 0.89 0.62 1207 – 887(1) – –
Cavallo et al. 2024 3.33 1.57 – 1230 -0.490 – – –
Hunt & Reffert 2023 4.09 0.89 0.62 1208 – – – –
Almeida et al. 2023 3.68 0.90 – 2588 -0.045 707(1) 0.78 –
Just et al. 2023 – – – 575 – 3289 – –
Jadhav & Subramaniam 2021 4.25 0.83 – 1175 – 1427 – 2(1)
Dias et al. 2021 3.71 1.41 – 1667 -0.223 – – –
Cantat-Gaudin et al. 2020 4.25 0.83 – 1175 – – – –
Kounkel et al. 2020 3.90 0.98 – 1023 – – – –
Cantat-Gaudin & Anders 2020 4.40 – – – – – – –
Liu & Pang 2019 – – – 692 0.500 – – –
Soubiran et al. 2018 4.40 – – – – – – –
Cantat-Gaudin et al. 2018 4.40 – – – – – – –
Loktin & Popova 2017 6.03 1.47 – 851 – – – –
Kharchenko et al. 2016 4.71 1.31 – 575 – – – –
Kharchenko et al. 2013 4.71 1.31 – 575 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0424 9.2 114.91 -30.93 0.23 -2.56 3.8 90.94 0.0
OC 0425 7.9 114.89 -30.94 0.22 -2.56 3.81 92.47 0.0

πŸ’‘ Note: The % column shows the percentage of members that Ruprecht 28 shares with each listed object.

Visualization
ℹ️
Ruprecht 28 UCC
Ruprecht 28 HUNT23
Ruprecht 28 CANTAT20
Galactocentric position diagram