Ruprecht 121

(MWSC 2446; OCL 983; ESO 277 06)

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0.88 UTI
1.0
CN
1.0
Cdens
1.0
CC3
0.71
Clit
1.0
Cdup
Nm (P>50%) 730
Core radius and density 1.3 [pc], 19 [pc-2]
C3 classification AA
  • CN 1.0 Very rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.71 Moderately studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Ruprecht 121 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is moderately studied in the literature.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.88 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.88 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0117, e_all=0.0889.

Morales et al. (2013)
Classified as morphological type 'OC2' (totally exposed cluster without correlation with ATLASGAL emission). Morphological flag: one or a few submm emission within the cluster area.

Data
πŸ” Search references for Ruprecht 121 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 250.428 -46.164 0.486 -1.102 -2.574 -53.036
Li et al. 2025 250.436 -46.159 0.462 -1.073 -2.569 –
Wei et al. 2025 250.444 -46.157 0.488 -1.115 -2.579 –
Hunt & Reffert 2024 250.433 -46.161 0.488 -1.107 -2.571 -47.388
Cavallo et al. 2024 250.427 -46.169 0.489 – – –
Hunt & Reffert 2023 250.433 -46.161 0.488 -1.107 -2.571 -47.388
Just et al. 2023 250.437 -46.149 – – – –
Dias et al. 2022 250.424 -46.155 0.489 -1.105 -2.573 -52.876
Cantat-Gaudin et al. 2020 250.436 -46.159 0.462 -1.073 -2.569 –
SΓ‘nchez et al. 2020 250.425 -46.15 – -1.031 -2.509 –
Cantat-Gaudin & Anders 2020 250.436 -46.159 0.462 -1.073 -2.569 –
Soubiran et al. 2018 250.436 -46.159 – – – -52.95
Bica et al. 2019 250.468 -46.155 – – – –
Cantat-Gaudin et al. 2018 250.436 -46.159 0.462 -1.073 -2.569 –
Dias et al. 2018 – – – -1.16 -2.99 –
Dib et al. 2018 250.447 -46.15 – – – –
Sampedro et al. 2017 250.425 -46.15 – -0.46 -2.25 –
Joshi et al. 2016 250.447 -46.15 – – – –
Kharchenko et al. 2016 250.437 -46.149 – – – –
Dias et al. 2014 250.425 -46.15 – -0.75 -2.38 –
Kharchenko et al. 2013 250.447 -46.15 – -5.48 -3.55 -16.4
Morales et al. 2013 250.425 -46.15 – – – –
Dias et al. 2002 250.425 -46.15 – -0.75 -2.38 –
Lynga 1987 250.512 -46.181 – – – –

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] Bfrac BSS
UCC 99999– 1.805 2.92 2.54 228 -0.142 2448 0.47 –
Li et al. 2025 1.74 2.38 – 185 0.170 – – –
Wei et al. 2025 1.57 1.98 – 191 -0.500 2448 0.47 –
Hunt & Reffert 2024 1.92 2.78 2.54 130 – 5902(1) – –
Cavallo et al. 2024 1.49 3.19 – 174 -0.430 – – –
Hunt & Reffert 2023 1.92 2.78 2.54 130 – – – –
Just et al. 2023 – – – 266 – 256 – –
Dias et al. 2022 1.87(1) 3.06(1) – 149(1) 0.146(1) – – –
Cantat-Gaudin et al. 2020 1.98 2.54 – 178 – – – –
Kounkel et al. 2020 1.99 2.39 – 316 – – – –
Cantat-Gaudin & Anders 2020 2.04 – – – – – – –
Soubiran et al. 2018 2.04 – – – – – – –
Cantat-Gaudin et al. 2018 2.04 – – – – – – –
Dib et al. 2018 1.24 – – 266 – – – –
Joshi et al. 2016 1.24 3.28 – 266 – – – –
Kharchenko et al. 2016 1.24 3.28 – 266 – – – –
Kharchenko et al. 2013 1.24 3.28 – 266 – – – –
Dias et al. 2002 1.24 3.28 – 266 – – – –

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

Visualization
ℹ️
Ruprecht 121 UCC
Ruprecht 121 HUNT23
Ruprecht 121 CANTAT20
Galactocentric position diagram