Ruprecht 75

(VDBH 65; MWSC 1657; OCL 786; vdBergh-Hagen 65; ESO 166 08; FSR 1499; FoF 42)

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0.85 UTI
0.8
CN
1.0
Cdens
0.75
CC3
0.84
Clit
1.0
Cdup
Nm (P>50%) 237
Core radius and density 1.4 [pc], 7.9 [pc-2]
C3 classification AB
  • CN 0.8 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.84 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Ruprecht 75 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below 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 mass parameter (see Parameters). It is well-studied in the literature.

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

Note: This object shares a small percentage of members with a later reported entry. 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: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.1047, e_all=0.1268.

Ahumada & Lapasset (2007)
All cluster parameters are from (2005AN....326....3A). Only stars up to 2' from the centre were considered.

Data
🔍 Search references for Ruprecht 75 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 99999– 140.486 -56.319 0.219 -6.091 5.032 -3.805
Li et al. 2025 140.486 -56.314 0.202 -6.118 4.995 –
Hu & Soubiran 2025 140.478 -56.325 – – – –
Almeida et al. 2025 140.487 -56.317 – – – –
Hunt & Reffert 2024 140.482 -56.313 0.216 -6.055 5.027 0.585
Cavallo et al. 2024 140.478 -56.325 0.22 – – –
Hunt & Reffert 2023 140.482 -56.313 0.216 -6.055 5.027 0.585
Just et al. 2023 140.475 -56.314 – – – –
Jadhav & Subramaniam 2021 140.486 -56.314 – – – –
Jaehnig et al. 2021 140.486 -56.319 0.234 -6.097 4.993 –
Rain et al. 2021 140.486 -56.314 0.202 -6.118 4.995 –
Dias et al. 2021 140.487 -56.317 0.201 -6.122 4.966 -2.056
Cantat-Gaudin et al. 2020 140.486 -56.314 0.202 -6.118 4.995 –
Cantat-Gaudin & Anders 2020 140.486 -56.314 0.202 -6.118 4.995 –
Liu & Pang 2019 140.503 -56.331 0.237 -5.964 4.921 –
Soubiran et al. 2018 140.486 -56.314 – – – -2.18
Bica et al. 2019 140.484 -56.303 – – – –
Cantat-Gaudin et al. 2018 140.486 -56.314 0.202 -6.118 4.995 –
Dias et al. 2018 – – – -3.94 4.24 –
Sampedro et al. 2017 140.479 -56.317 – -1.24 0.54 –
Kharchenko et al. 2016 140.475 -56.314 – – – –
Dias et al. 2014 140.479 -56.317 – -1.14 0.33 –
Kharchenko et al. 2013 140.479 -56.317 – -9.65 5.46 –
Bukowiecki et al. 2011 140.488 -56.312 – – – –
Ahumada & Lapasset 2007 140.475 -56.317 – – – –
Dias et al. 2002 140.479 -56.317 – -9.65 5.46 –
Lynga 1987 140.548 -56.282 – – – –
van den Bergh & Hagen 1975 140.175 -56.067 – – – –

💡 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– 4.03 0.79 1.08 1413 -0.165 468 – 1
Li et al. 2025 3.77 1.02 – 1494 -0.020 – – –
Hu & Soubiran 2025 – – – – -0.240(5) – – –
Almeida et al. 2025 3.70 1.20 – 1416 – 203 – –
Hunt & Reffert 2024 3.97 1.25 1.08 789 – 1686(1) – –
Cavallo et al. 2024 2.78 1.12 – 2089 -0.220 – – –
Hunt & Reffert 2023 3.97 1.25 1.08 789 – – – –
Just et al. 2023 – – – 1230 – 491 – –
Jadhav & Subramaniam 2021 3.94 0.39 – 1698 – 444 – 1(1)
Jaehnig et al. 2021 4.26(1) – – – – – – –
Rain et al. 2021 4.34 0.76 – 1413 – – – 1
Dias et al. 2021 3.70 1.20 – 1416 -0.165 – – –
Cantat-Gaudin et al. 2020 3.94 0.39 – 1698 – – – –
Kounkel et al. 2020 4.09 1.15 – 1072 – – – –
Cantat-Gaudin & Anders 2020 4.34 – – – – – – –
Liu & Pang 2019 – – – 1070 0.500 – – –
Soubiran et al. 2018 4.34 – – – – – – –
Cantat-Gaudin et al. 2018 4.34 – – – – – – –
Kharchenko et al. 2016 4.41 0.79 – 1230 – – – –
Kharchenko et al. 2013 4.41 0.79 – 1230 – – – –
Bukowiecki et al. 2011 3.80(1) 0.60 – 1413 – – – –
Ahumada & Lapasset 2007 – 0.76 – 1413 – – – 9
Dias et al. 2002 4.30 0.76 – 1413 – – – –

(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 0519 13.9 140.48 -56.32 0.22 -6.09 5.03 -3.24 0.0

💡 Note: The % column shows the percentage of members that Ruprecht 75 shares with each listed object.

Visualization
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Ruprecht 75 UCC
Ruprecht 75 HUNT23
Ruprecht 75 CANTAT20
Galactocentric position diagram