Ruprecht 121
(MWSC 2446; OCL 983; ESO 277 06)
0.94
UTI
1.0
CN
1.0
Cdens
1.0
CC3
0.86
Clit
1.0
Cdup
Radius (P>50% members)
5.2 [arcmin]
- CN 1.0 Very rich
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.86 Well-studied
- Cdup 1.0 Unique
Overview
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 parameter (see Parameters). It is well-studied in the literature.
Relatively close
Moderate extinction
Massive
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | β | 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 | β |
| Wei et al. | 2025 | 250.444 | -46.157 | 0.488 | -1.115 | -2.579 | β |
| 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 | β | β | β |
| Hunt & Reffert | 2023 | 250.433 | -46.161 | 0.488 | -1.107 | -2.571 | -47.388 |
| Just et al. | 2023 | 250.437 | -46.149 | β | β | β | β |
| Cantat-Gaudin et al. | 2020 | 250.436 | -46.159 | 0.462 | -1.073 | -2.569 | β |
| SΓ‘nchez et al. | 2020 | 250.425 | -46.15 | β | -1.031 | -2.509 | β |
| Cantat-Gaudin & Anders | 2020 | 250.436 | -46.159 | 0.462 | -1.073 | -2.569 | β |
| Soubiran et al. | 2018 | 250.436 | -46.159 | β | β | β | -52.95 |
| Bica et al. | 2019 | 250.468 | -46.155 | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 250.436 | -46.159 | 0.462 | -1.073 | -2.569 | β |
| Kharchenko et al. | 2016 | 250.437 | -46.149 | β | β | β | β |
| Dias et al. | 2014 | 250.425 | -46.15 | β | -0.75 | -2.38 | β |
| Kharchenko et al. | 2013 | 250.447 | -46.15 | β | -5.48 | -3.55 | -16.4 |
| Dias et al. | 2002 | 250.425 | -46.15 | β | -0.75 | -2.38 | β |
π‘ 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 | 1.74 | 2.38 | β | 185 | 0.170 | β | β | β |
| Wei et al. | 2025 | 1.57 | 1.98 | β | 191 | -0.500 | 2448 | 0.47 | β |
| Hunt & Reffert | 2024 | β | β | β | β | β | 5902* | β | β |
| Cavallo et al. | 2024 | 1.49 | 3.19 | β | 174 | -0.430 | β | β | β |
| Hunt & Reffert | 2023 | 1.92 | 2.78 | 2.54 | 130 | β | β | β | β |
| Just et al. | 2023 | β | β | β | 266 | β | 256 | β | β |
| Cantat-Gaudin et al. | 2020 | 1.98 | 2.54 | β | 178 | β | β | β | β |
| Cantat-Gaudin & Anders | 2020 | 2.04 | β | β | β | β | β | β | β |
| Soubiran et al. | 2018 | 2.04 | β | β | β | β | β | β | β |
| Cantat-Gaudin et al. | 2018 | 2.04 | β | β | β | β | β | β | β |
| Kharchenko et al. | 2016 | 1.24 | 3.23 | β | 266 | β | β | β | β |
| Kharchenko et al. | 2013 | 1.24 | 3.23 | β | 266 | β | β | β | β |
| Dias et al. | 2002 | 1.24 | 3.23 | β | 266 | β | β | β | β |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.