Ruprecht 23

(FSR 1286; MWSC 1248; OCL 632; ESO 492 17; FoF 90)

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0.91 UTI
0.8
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 240
Radius (P>50% members) 4.5 [arcmin]
  • CN 0.8 Rich
  • 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
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Ruprecht 23 is a rich, very dense 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 (see Parameters). It is very well-studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Ruprecht 23 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 – 112.663 -23.375 0.342 -2.065 1.61 59.894
Li et al. 2025 112.665 -23.383 0.341 -2.078 1.56 –
Almeida et al. 2025 112.669 -23.387 – – – –
Hunt & Reffert 2024 112.658 -23.38 0.344 -2.058 1.624 55.244
Cavallo et al. 2024 112.654 -23.368 0.346 – – –
Hunt & Reffert 2023 112.658 -23.38 0.344 -2.058 1.624 55.244
Just et al. 2023 112.644 -23.381 – – – –
Dias et al. 2021 112.669 -23.387 0.34 -2.081 1.553 54.405
Cantat-Gaudin et al. 2020 112.665 -23.383 0.341 -2.078 1.56 –
Cantat-Gaudin & Anders 2020 112.665 -23.383 0.341 -2.078 1.56 –
Liu & Pang 2019 112.65 -23.378 0.349 -2.032 1.549 –
Soubiran et al. 2018 112.665 -23.383 – – – 56.31
Bica et al. 2019 112.671 -23.375 – – – –
Cantat-Gaudin et al. 2018 112.665 -23.383 0.341 -2.078 1.56 –
Loktin & Popova 2017 112.65 -23.395 – -2.537 2.82 –
Kharchenko et al. 2016 112.644 -23.381 – – – –
Dias et al. 2014 112.662 -23.393 – -2.75 2.68 –
Kharchenko et al. 2013 112.65 -23.383 – -1.89 3.53 –
Froebrich et al. 2007 112.667 -23.394 – – – –
Dias et al. 2002 112.662 -23.393 – -2.75 2.68 –

💡 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 2.50 2.00 – 407 -0.090 – – –
Almeida et al. 2025 1.89 1.18 – 902 – 538 – –
Hunt & Reffert 2024 – – – – – 892* – –
Cavallo et al. 2024 2.54 2.10 – 479 -0.090 – – –
Hunt & Reffert 2023 2.61 1.75 1.48 479 – – – –
Just et al. 2023 – – – 603 – 499 – –
Dias et al. 2021 1.89 1.18 – 902 0.245 – – –
Cantat-Gaudin et al. 2020 2.73 1.49 – 407 – – – –
Cantat-Gaudin & Anders 2020 2.70 – – – – – – –
Liu & Pang 2019 – – – 851 -1.000 – – –
Soubiran et al. 2018 2.70 – – – – – – –
Cantat-Gaudin et al. 2018 2.70 – – – – – – –
Loktin & Popova 2017 2.85 1.29 – 1622 – – – –
Kharchenko et al. 2016 3.02 1.94 – 603 – – – –
Kharchenko et al. 2013 3.02 1.94 – 603 – – – –
Dias et al. 2002 3.06 1.67 – 603 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWNU 1592 1.2 112.67 -23.15 0.32 -1.76 1.72 – 0.37

💡 Note: The % column shows the percentage of members that Ruprecht 23 shares with each listed object.

Visualization
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Ruprecht 23 UCC
Ruprecht 23 HUNT23
Ruprecht 23 CANTAT20
Galactocentric position diagram