Ruprecht 1

(MWSC 929; OCL 563; FoF 655)

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0.95 UTI
0.77
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 159
Radius (P>50% members) 7.8 [arcmin]
  • CN 0.77 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Ruprecht 1 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively 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 and mass parameters (see Parameters). It is very well-studied in the literature.

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

Relatively 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
πŸ” Search references for Ruprecht 1 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 99.075 -14.166 0.641 -0.299 -0.902 11.208
Li et al. 2025 99.084 -14.157 0.631 -0.316 -0.9 –
Hu & Soubiran 2025 99.058 -14.169 – – – –
Almeida et al. 2025 99.082 -14.151 – – – –
Hunt & Reffert 2024 99.099 -14.167 0.641 -0.293 -0.901 9.39
Cavallo et al. 2024 99.058 -14.169 0.642 – – –
Hunt & Reffert 2023 99.099 -14.167 0.641 -0.293 -0.901 9.39
Almeida et al. 2023 99.078 -14.163 – – – –
Just et al. 2023 99.129 -14.192 – – – –
Tarricq et al. 2022 99.094 -14.178 0.651 -0.304 -0.908 –
Dias et al. 2021 99.082 -14.151 0.633 -0.322 -0.899 11.459
Cantat-Gaudin et al. 2020 99.084 -14.157 0.631 -0.316 -0.9 –
SΓ‘nchez et al. 2020 99.088 -14.147 – -0.262 -1.023 –
Cantat-Gaudin & Anders 2020 99.084 -14.157 0.631 -0.316 -0.9 –
Liu & Pang 2019 99.056 -14.158 0.64 -0.305 -0.867 –
Bossini et al. 2019 99.084 -14.157 – – – –
Soubiran et al. 2018 99.084 -14.157 – – – 12.52
Bica et al. 2019 99.104 -14.148 – – – –
Cantat-Gaudin et al. 2018 99.084 -14.157 0.631 -0.316 -0.9 –
Loktin & Popova 2017 99.09 -14.146 – 0.064 0.884 –
Kharchenko et al. 2016 99.129 -14.192 – – – –
Dias et al. 2014 99.087 -14.147 – 0.49 -0.66 –
Kharchenko et al. 2013 99.135 -14.193 – 0.48 0.44 –
Piskunov et al. 2008 99.099 -14.183 – – – –
Piskunov et al. 2007 99.099 -14.183 – – – –
Kharchenko et al. 2005 99.1 -14.18 – 2.2 0.1 –
Kharchenko et al. 2003 99.07 -14.17 – -0.75 -0.74 –
Dias et al. 2002 99.088 -14.147 – 0.49 -0.66 –

πŸ’‘ 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 1.45 0.61 – 535 -0.062 – – –
Hu & Soubiran 2025 – – – – -0.230* – – –
Almeida et al. 2025 1.43 0.74 – 432 – 345 – –
Hunt & Reffert 2024 – – – – – 739* – –
Cavallo et al. 2024 1.50 0.28 – 813 0.390 – – –
Hunt & Reffert 2023 1.45 0.26 0.54 486 – – – –
Almeida et al. 2023 1.46 0.74 – 484 -0.065 403* 0.53 –
Just et al. 2023 – – – 617 – 30 – –
Tarricq et al. 2022 1.48 – – 309 – – – –
Dias et al. 2021 1.43 0.74 – 432 -0.077 – – –
Cantat-Gaudin et al. 2020 1.53 0.61 – 288 – – – –
Cantat-Gaudin & Anders 2020 1.51 – – – – – – –
Liu & Pang 2019 – – – 576 0.500 – – –
Bossini et al. 2019 1.44 0.70 – 318 -0.250 – – –
Soubiran et al. 2018 1.51 – – – – – – –
Cantat-Gaudin et al. 2018 1.51 – – – – – – –
Loktin & Popova 2017 2.41 0.27 – 631 – – – –
Kharchenko et al. 2016 1.20 0.45 – 617 – – – –
Kharchenko et al. 2013 1.20 0.45 – 617 – – – –
Piskunov et al. 2008 1.10 0.46 – 575 – 133* – –
Piskunov et al. 2007 1.10 0.46 – 575 – 29 – –
Kharchenko et al. 2005 1.10 0.46 – 575 – – – –
Kharchenko et al. 2003 1.00 0.62 – – – – – –
Dias et al. 2002 1.48 0.53 – 479 -0.250 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
FSR 1179 64.2 99.1 -14.17 0.65 -0.29 -0.9 10.98 0.0

πŸ’‘ Note: The % column shows the percentage of members that Ruprecht 1 shares with each listed object.

Visualization
ℹ️
Ruprecht 1 UCC
Ruprecht 1 HUNT23
Ruprecht 1 CANTAT20
Galactocentric position diagram