Ruprecht 8

(MWSC 1068)

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0.50 UTI
0.52
CN
0.27
Cdens
0.75
CC3
0.48
Clit
1.0
Cdup
Nm (P>50%) 55
Core radius and density 1.5 [pc], 1.3 [pc-2]
C3 classification AB
  • CN 0.52 Moderately populated
  • Cdens 0.27 Loose
  • CC3 0.75 High quality
  • Clit 0.48 Poorly studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Ruprecht 8 is a moderately populated, loose 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 near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is poorly studied in the literature.

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

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good 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=0.565, e_all=0.1537.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg49' along with NGC 2318.

Data
🔍 Search references for Ruprecht 8 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– 105.442 -13.539 0.442 -1.013 -1.406 23.994
Li et al. 2025 105.424 -13.539 0.444 -1.02 -1.424 –
Hu & Soubiran 2025 105.471 -13.552 – – – –
Almeida et al. 2025 105.423 -13.527 – – – –
Hunt & Reffert 2024 105.43 -13.539 0.449 -1.001 -1.385 46.271
Cavallo et al. 2024 105.471 -13.552 0.451 – – –
Hunt & Reffert 2023 105.43 -13.539 0.449 -1.001 -1.385 46.271
Almeida et al. 2023 105.429 -13.524 – – – –
Just et al. 2023 105.432 -13.558 – – – –
Jadhav & Subramaniam 2021 105.424 -13.539 – – – –
Dias et al. 2021 105.423 -13.527 0.453 -1.02 -1.433 –
Cantat-Gaudin et al. 2020 105.424 -13.539 0.444 -1.02 -1.424 –
Cantat-Gaudin & Anders 2020 105.424 -13.539 0.444 -1.02 -1.424 –
Dias et al. 2018 – – – -1.22 0.75 –
Sampedro et al. 2017 105.425 -13.583 – -0.88 -0.71 –
Kharchenko et al. 2016 105.432 -13.558 – – – –
Kharchenko et al. 2013 105.438 -13.56 – 1.17 -0.26 –
Lynga 1987 105.428 -13.589 – – – –

💡 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– 2.14 1.12 0.66 432 -0.002 318 0.5 0
Li et al. 2025 2.17 1.12 – 464 0.258 – – –
Hu & Soubiran 2025 – – – – -0.260(5) – – –
Almeida et al. 2025 1.83 1.35 – 388 – 285 – –
Hunt & Reffert 2024 2.07 1.02 0.66 432 – 515(1) – –
Cavallo et al. 2024 2.16 0.98 – 562 0.610 – – –
Hunt & Reffert 2023 2.07 1.02 0.66 432 – – – –
Almeida et al. 2023 2.03 1.41 – 357 -0.002 336(1) 0.50 –
Just et al. 2023 – – – 700 – 94 – –
Jadhav & Subramaniam 2021 2.25 1.03 – 398 – 318 – 0(1)
Dias et al. 2021 1.83 1.35 – 388 -0.086 – – –
Cantat-Gaudin et al. 2020 2.25 1.03 – 398 – – – –
Cantat-Gaudin & Anders 2020 2.12 – – – – – – –
Kharchenko et al. 2016 2.19 1.44 – 700 – – – –
Kharchenko et al. 2013 2.19 1.44 – 700 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 219 96.4 105.44 -13.56 0.44 -1.01 -1.4 23.99 0.07

💡 Note: The % column shows the percentage of members that Ruprecht 8 shares with each listed object.

Visualization
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Ruprecht 8 UCC
Ruprecht 8 HUNT23
Ruprecht 8 CANTAT20
Galactocentric position diagram