Ruprecht 108

(OCL 907; ESO 132 11; MWSC2132)

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0.86 UTI
0.57
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 64
Radius (P>50% members) 7.1 [arcmin]
C3 classification AB
  • CN 0.57 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Ruprecht 108 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is very well-studied in the literature.
Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Ruprecht 108 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 202.988 -58.493 1.013 -8.979 -2.277 -37.086
Li et al. 2025 203.002 -58.509 0.977 -9.025 -2.323 –
Almeida et al. 2025 203.004 -58.494 – – – –
Hunt & Reffert 2024 203.012 -58.495 1.001 -8.964 -2.283 -43.238
Cavallo et al. 2024 202.942 -58.488 1.012 – – –
Hunt & Reffert 2023 203.012 -58.495 1.001 -8.964 -2.283 -43.238
Almeida et al. 2023 203.003 -58.511 – – – –
He et al. 2022 203.017 -58.498 1.007 -8.984 -2.289 –
Dias et al. 2021 203.004 -58.494 0.985 -8.97 -2.278 –
Cantat-Gaudin et al. 2020 203.002 -58.509 0.977 -9.025 -2.323 –
Cantat-Gaudin & Anders 2020 203.002 -58.509 0.977 -9.025 -2.323 –
Bossini et al. 2019 203.002 -58.509 – – – –
Bica et al. 2019 203.044 -58.47 – – – –
Cantat-Gaudin et al. 2018 203.002 -58.509 0.977 -9.025 -2.323 –
Loktin & Popova 2017 203.055 -58.467 – -8.052 0.045 –
Dias et al. 2014 203.046 -58.467 – -8.31 -2.52 –
Piskunov et al. 2008 203.044 -58.471 – – – –
van den Bergh 2006 203.042 -58.467 – – – –
Kharchenko et al. 2005 203.05 -58.47 – -10.28 -2.8 –
Kharchenko et al. 2003 203.05 -58.47 – -11.05 -2.68 –
Dias et al. 2002 203.046 -58.467 – -10.06 -3.25 –

💡 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
Li et al. 2025 1.17 0.70 – 159 -0.055 – – –
Almeida et al. 2025 1.00 0.68 – 234 – 77 – –
Hunt & Reffert 2024 – – – – – 188* – –
Cavallo et al. 2024 0.99 0.80 – 170 0.110 – – –
Hunt & Reffert 2023 0.94 0.48 0.39 221 – – – –
Almeida et al. 2023 0.96 0.80 – 175 -0.111 83* 0.50 –
He et al. 2022 – 0.75 – 71 – – – –
Tarricq et al. 2022 0.97 – – 85 – – – –
Dias et al. 2021 1.00 0.68 – 234 0.086 – – –
Cantat-Gaudin et al. 2020 0.99 0.27 – 83 – – – –
Cantat-Gaudin & Anders 2020 0.99 – – – – – – –
Bossini et al. 2019 0.98 0.49 – 89 0.000 – – –
Cantat-Gaudin et al. 2018 0.99 – – – – – – –
Loktin & Popova 2017 0.96 0.44 – 262 – – – –
Piskunov et al. 2008 0.90 0.43 – 257 – – – –
van den Bergh 2006 0.90 0.43 – 263 – – – –
Kharchenko et al. 2005 0.90 0.43 – 257 – – – –
Kharchenko et al. 2003 0.90 0.43 – – – – – –
Dias et al. 2002 0.90 0.42 – 265 – – – –

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

Visualization
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Ruprecht 108 UCC
Ruprecht 108 HUNT23
Ruprecht 108 CANTAT20
Galactocentric position diagram