UPK 33

Click to load Aladin Lite
0.67 UTI
0.66
CN
1.0
Cdens
0.38
CC3
0.65
Clit
1.0
Cdup
C3 classification BC
Number of members (P>50%) 81
Radius (P>50% members) 18.3 [arcmin]
  • CN 0.66 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.38 Low quality
  • Clit 0.65 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
UPK 33 is a moderately populated, very dense object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is moderately studied in the literature.
Close Moderate 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 UPK 33 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 280.089 -4.288 1.948 -0.059 -10.964 -9.056
Almeida et al. 2025 280.022 -4.329 – – – –
Alfonso et al. 2024 280.085 -4.253 1.91 -0.075 -10.958 –
Hunt & Reffert 2024 280.117 -4.36 1.962 -0.075 -10.846 -3.669
Cavallo et al. 2024 280.056 -4.297 1.961 – – –
Hunt & Reffert 2023 280.117 -4.36 1.962 -0.075 -10.846 -3.669
Almeida et al. 2023 280.01 -4.362 – – – –
Tarricq et al. 2022 280.043 -4.378 1.953 -0.003 -10.94 –
Dias et al. 2021 280.022 -4.329 1.935 -0.101 -10.932 -10.418
Cantat-Gaudin et al. 2020 280.046 -4.333 1.945 -0.124 -11.012 –
Cantat-Gaudin & Anders 2020 280.051 -4.285 1.931 -0.087 -10.888 –
Sim et al. 2019 280.042 -4.346 – -0.13 -10.95 –

💡 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
Almeida et al. 2025 0.51 2.25 – 71 – 78 – –
Alfonso et al. 2024 0.52 1.64 – 223 0.042 – – –
Hunt & Reffert 2024 – – – – – 152* – –
Cavallo et al. 2024 0.52 2.38 – 129 0.020 – – –
Hunt & Reffert 2023 0.50 2.45 2.00 57 – – – –
Almeida et al. 2023 0.50 2.19 – 107 0.032 106* 0.78 –
Tarricq et al. 2022 0.52 – – 295 – – – –
Dias et al. 2021 0.51 2.25 – 71 0.042 – – –
Cantat-Gaudin et al. 2020 0.52 1.64 – 282 – – – –
Cantat-Gaudin & Anders 2020 0.51 – – – – – – –
Sim et al. 2019 0.51 – – 794 – – – –

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

Visualization
ℹī¸
UPK 33 UCC
UPK 33 HUNT23
UPK 33 CANTAT20
Galactocentric position diagram