Ruprecht 45

(MWSC 1404)

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0.91 UTI
0.81
CN
1.0
Cdens
1.0
CC3
0.86
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 257
Radius (P>50% members) 5.0 [arcmin]
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.86 Well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Ruprecht 45 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, well above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption, metallicity, and mass parameters (see Parameters). It is well-studied in the literature.

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

Distant Low extinction Near-solar metallicity Old

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Ruprecht 45 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 119.895 -16.293 0.213 -2.682 2.844 97.414
Li et al. 2025 119.894 -16.292 0.192 -2.712 2.817 –
Hu & Soubiran 2025 119.892 -16.295 – – – –
Almeida et al. 2025 119.892 -16.284 – – – –
Hunt & Reffert 2024 119.9 -16.291 0.21 -2.669 2.851 98.771
Cavallo et al. 2024 119.892 -16.295 0.209 – – –
Hunt & Reffert 2023 119.9 -16.291 0.21 -2.669 2.851 98.771
Just et al. 2023 119.87 -16.303 – – – –
Dias et al. 2021 119.892 -16.284 0.195 -2.697 2.831 97.63
Cantat-Gaudin et al. 2020 119.894 -16.292 0.192 -2.712 2.817 –
SΓ‘nchez et al. 2020 119.9 -16.3 – -2.587 2.743 –
Cantat-Gaudin & Anders 2020 119.894 -16.292 0.192 -2.712 2.817 –
Soubiran et al. 2018 119.894 -16.292 – – – 97.5
Cantat-Gaudin et al. 2018 119.894 -16.292 0.192 -2.712 2.817 –
Kharchenko et al. 2016 119.87 -16.303 – – – –
Dias et al. 2014 119.9 -16.3 – -6.14 0.13 –
Kharchenko et al. 2013 119.875 -16.305 – -4.58 0.19 –

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] Bfr BSS
Li et al. 2025 4.32 0.41 – 2755 -0.364 – – –
Hu & Soubiran 2025 – – – – -0.250* – – –
Almeida et al. 2025 4.23 0.32 – 3606 – 742 – –
Hunt & Reffert 2024 – – – – – 961* – –
Cavallo et al. 2024 2.84 0.84 – 3548 -1.020 – – –
Hunt & Reffert 2023 4.03 0.09 0.96 2051 – – – –
Just et al. 2023 – – – 1995 – 82 – –
Dias et al. 2021 4.23 0.32 – 3606 -0.307 – – –
Cantat-Gaudin et al. 2020 4.04 0.20 – 3162 – – – –
Cantat-Gaudin & Anders 2020 4.52 – – – – – – –
Soubiran et al. 2018 4.52 – – – – – – –
Cantat-Gaudin et al. 2018 4.52 – – – – – – –
Kharchenko et al. 2016 1.89 0.19 – 1995 – – – –
Kharchenko et al. 2013 1.89 0.19 – 1995 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0402 21.8 119.89 -16.29 0.22 -2.65 2.85 96.82 0.0

πŸ’‘ Note: The % column shows the percentage of members that Ruprecht 45 shares with each listed object.

Visualization
ℹ️
Ruprecht 45 UCC
Ruprecht 45 HUNT23
Ruprecht 45 CANTAT20
Galactocentric position diagram