Ruprecht 65

(OCL 750; ESO 259 15; MWSC 1522)

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0.83 UTI
0.75
CN
1.0
Cdens
0.75
CC3
0.82
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 103
Radius (P>50% members) 3.9 [arcmin]
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.82 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Ruprecht 65 is a rich, 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, young cluster (see Parameters). It is well-studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Ruprecht 65 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 129.817 -44.05 0.441 -4.754 4.294 –
Li et al. 2025 129.838 -44.041 0.412 -4.746 4.245 –
Almeida et al. 2025 129.856 -44.019 – – – –
Hunt & Reffert 2024 129.834 -44.058 0.438 -4.754 4.291 –
Celli et al. 2024 129.838 -44.041 – – – –
Cavallo et al. 2024 129.812 -44.038 0.437 – – –
Hunt & Reffert 2023 129.834 -44.058 0.438 -4.754 4.291 –
Dias et al. 2021 129.856 -44.019 0.404 -4.757 4.244 –
Cantat-Gaudin et al. 2020 129.838 -44.041 0.412 -4.746 4.245 –
Cantat-Gaudin & Anders 2020 129.838 -44.041 0.412 -4.746 4.245 –
Bica et al. 2019 129.813 -44.046 – – – –
Dias et al. 2014 129.817 -44.05 – -0.51 1.79 –
Piskunov et al. 2008 129.802 -44.052 – – – –
Kharchenko et al. 2005 129.81 -44.05 – -7.37 4.16 –
Kharchenko et al. 2003 129.79 -44.03 – -6.08 1.98 –
Dias et al. 2002 129.817 -44.05 – -0.51 1.79 –

💡 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 2.01 1.60 – 36 0.047 – – –
Almeida et al. 2025 2.02 1.68 – 45 – 191 – –
Hunt & Reffert 2024 – – – – – 576* – –
Celli et al. 2024 – – – 23 – 237 – –
Cavallo et al. 2024 2.11 1.71 – 51 0.340 – – –
Hunt & Reffert 2023 2.11 1.70 2.00 38 – – – –
Dias et al. 2021 2.02 1.68 – 45 0.089 – – –
Cantat-Gaudin et al. 2020 2.41 1.71 – 23 – – – –
Cantat-Gaudin & Anders 2020 2.27 – – – – – – –
Piskunov et al. 2008 0.50 0.22 – 372 – – – –
Kharchenko et al. 2005 0.50 0.22 – 372 – – – –
Kharchenko et al. 2003 0.66 0.16 – – – – – –
Dias et al. 2002 0.50 0.22 – 372 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 244 91.3 129.82 -44.05 0.44 -4.76 4.3 – 0.02

💡 Note: The % column shows the percentage of members that Ruprecht 65 shares with each listed object.

Visualization
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Ruprecht 65 UCC
Ruprecht 65 HUNT23
Ruprecht 65 CANTAT20
Galactocentric position diagram