Ruprecht 161

(MWSC 1773; OCL 810; ESO 127 09)

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0.89 UTI
0.68
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 87
Radius (P>50% members) 15.1 [arcmin]
  • CN 0.68 Moderately populated
  • 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
ℹī¸
Ruprecht 161 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, near 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 age and metallicity parameters (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.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Ruprecht 161 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 152.332 -61.258 1.108 -10.377 3.782 17.64
Li et al. 2025 152.4 -61.259 1.086 -10.391 3.742 –
Almeida et al. 2025 152.396 -61.262 – – – –
Alfonso et al. 2024 152.348 -61.257 1.074 -10.374 3.79 –
Hunt & Reffert 2024 152.317 -61.246 1.091 -10.425 3.788 15.944
Cavallo et al. 2024 152.291 -61.239 1.106 – – –
Hunt & Reffert 2023 152.317 -61.246 1.091 -10.425 3.788 15.944
Just et al. 2023 152.288 -61.257 – – – –
He et al. 2022 152.289 -61.233 1.108 -10.402 3.799 –
Tarricq et al. 2022 152.262 -61.251 1.111 -10.392 3.818 –
Dias et al. 2021 152.396 -61.262 1.088 -10.372 3.714 22.843
Cantat-Gaudin et al. 2020 152.4 -61.259 1.086 -10.391 3.742 –
Cantat-Gaudin & Anders 2020 152.4 -61.259 1.086 -10.391 3.742 –
Bossini et al. 2019 152.4 -61.259 – – – –
Bica et al. 2019 152.211 -61.2 – – – –
Cantat-Gaudin et al. 2018 152.4 -61.259 1.086 -10.391 3.742 –
Kharchenko et al. 2016 152.288 -61.257 – – – –
Dias et al. 2014 152.192 -61.25 – -3.54 1.62 –
Kharchenko et al. 2013 152.295 -61.26 – -7.5 3.5 9.4
Gozha et al. 2012 152.192 -61.25 – – – –
Piskunov et al. 2008 152.182 -61.289 – – – –
Kharchenko et al. 2007 152.19 -61.25 – 0.3 – 9.4
Piskunov et al. 2007 152.182 -61.289 – – – –
Kharchenko et al. 2005 152.19 -61.29 – -8.2 3.04 –
Kharchenko et al. 2003 152.4 -61.31 – -4.82 5.59 –

💡 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 0.91 0.03 – 511 0.155 – – –
Almeida et al. 2025 0.89 0.24 – 355 – 196 – –
Alfonso et al. 2024 0.90 0.33 – 131 0.069 – – –
Hunt & Reffert 2024 – – – – – 171* – –
Cavallo et al. 2024 0.87 0.08 – 407 0.410 – – –
Hunt & Reffert 2023 0.86 0.18 0.65 168 – – – –
Just et al. 2023 – – – 282 – 39 – –
He et al. 2022 – 0.45 – 50 – – – –
Tarricq et al. 2022 0.88 – – 110 – – – –
Dias et al. 2021 0.89 0.24 – 355 0.069 – – –
Cantat-Gaudin et al. 2020 0.90 0.33 – 105 – – – –
Cantat-Gaudin & Anders 2020 0.90 – – – – – – –
Bossini et al. 2019 0.89 0.32 – 97 0.000 – – –
Cantat-Gaudin et al. 2018 0.90 – – – – – – –
Kharchenko et al. 2016 0.98 0.52 – 282 – – – –
Kharchenko et al. 2013 0.98 0.52 – 282 – – – –
Gozha et al. 2012 1.43 – – 245 – 708 – –
Piskunov et al. 2008 0.94 0.28 – 245 – 336* – –
Piskunov et al. 2007 0.94 0.28 – 245 – 90 – –
Kharchenko et al. 2005 0.94 0.28 – 245 – – – –
Kharchenko et al. 2003 1.43 0.31 – – – – – –

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

Visualization
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Ruprecht 161 UCC
Ruprecht 161 HUNT23
Ruprecht 161 CANTAT20
Galactocentric position diagram