Ruprecht 145

(OCL 52; ESO 592 02; MWSC 3005)

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0.97 UTI
0.83
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 321
Radius (P>50% members) 20.4 [arcmin]
  • CN 0.83 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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 145 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.
Close Low extinction Near-solar metallicity Intermediate age

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 145 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 – 282.655 -18.281 1.652 8.354 -4.129 -55.311
Li et al. 2025 282.636 -18.27 1.651 8.329 -4.08 –
Hu & Soubiran 2025 282.656 -18.278 – – – –
Wei et al. 2025 282.924 -18.022 1.651 8.329 -4.003 –
Almeida et al. 2025 282.67 -18.232 – – – –
Alfonso et al. 2024 282.649 -18.244 1.615 8.337 -4.096 –
Hunt & Reffert 2024 282.658 -18.293 1.653 8.372 -4.131 -56.166
Cavallo et al. 2024 282.656 -18.278 1.655 – – –
Hunt & Reffert 2023 282.658 -18.293 1.653 8.372 -4.131 -56.166
Almeida et al. 2023 282.617 -18.201 – – – –
He et al. 2022 282.637 -18.276 1.66 8.319 -4.14 –
Tarricq et al. 2022 282.655 -18.307 1.653 8.348 -4.096 –
Dias et al. 2021 282.67 -18.232 1.651 8.32 -4.058 -50.624
Cantat-Gaudin et al. 2020 282.636 -18.27 1.651 8.329 -4.08 –
Cantat-Gaudin & Anders 2020 282.636 -18.27 1.651 8.329 -4.08 –
Soubiran et al. 2018 282.636 -18.27 – – – -54.7
Bica et al. 2019 282.578 -18.182 – – – –
Cantat-Gaudin et al. 2018 282.636 -18.27 1.651 8.329 -4.08 –
Loktin & Popova 2017 282.66 -18.227 – 2.416 -7.028 -8.8
Dias et al. 2014 282.65 -18.25 – 0.81 -4.73 –
Piskunov et al. 2008 282.64 -18.221 – – – –
Piskunov et al. 2007 282.64 -18.221 – – – –
Kharchenko et al. 2005 282.64 -18.22 – 6.43 -4.51 –
Kharchenko et al. 2003 282.63 -18.21 – 6.1 -5.31 –
Dias et al. 2002 282.65 -18.25 – 6.1 -5.31 -8.8

💡 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 0.57 0.58 – 1058 0.061 – – –
Hu & Soubiran 2025 – – – – -0.120* – – –
Wei et al. 2025 0.71 0.68 – 891 0.250 703 0.44 –
Almeida et al. 2025 0.58 0.73 – 931 – 394 – –
Alfonso et al. 2024 0.63 0.55 – 966 0.038 – – –
Hunt & Reffert 2024 – – – – – 575* – –
Cavallo et al. 2024 0.60 0.79 – 776 0.330 – – –
Hunt & Reffert 2023 0.57 0.57 0.68 568 – – – –
Almeida et al. 2023 0.59 0.69 – 966 0.062 496* 0.54 –
He et al. 2022 – 1.05 – 631 – – – –
Tarricq et al. 2022 0.62 – – 813 – – – –
Dias et al. 2021 0.58 0.73 – 931 0.037 – – –
Cantat-Gaudin et al. 2020 0.63 0.55 – 813 – – – –
Cantat-Gaudin & Anders 2020 0.60 – – – – – – –
Soubiran et al. 2018 0.60 – – – – – – –
Cantat-Gaudin et al. 2018 0.60 – – – – – – –
Loktin & Popova 2017 2.57 1.44 – 1380 – – – –
Piskunov et al. 2008 0.77 0.78 – 437 – 427* – –
Piskunov et al. 2007 0.77 0.78 – 437 – 157 – –
Kharchenko et al. 2005 0.77 0.78 – 437 – – – –
Kharchenko et al. 2003 0.67 0.62 – – – – – –
Dias et al. 2002 0.32 0.56 – 32 -0.127 – – –

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

Visualization
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Ruprecht 145 UCC
Ruprecht 145 HUNT23
Ruprecht 145 CANTAT20
Galactocentric position diagram