UPK 28

Click to load Aladin Lite
0.77 UTI
0.6
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 69
Radius (P>50% members) 8.2 [arcmin]
  • CN 0.6 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.75 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
UPK 28 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is well-studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Close High extinction Near-solar metallicity Young

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UPK 28 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 277.352 -4.977 1.093 0.807 -2.555 -6.135
Li et al. 2025 277.352 -4.974 1.109 0.772 -2.511 –
Almeida et al. 2025 277.359 -4.984 – – – –
Alfonso et al. 2024 276.816 -5.789 0.913 0.613 -2.32 –
Hunt & Reffert 2024 277.362 -4.982 1.11 0.827 -2.589 10.616
Cavallo et al. 2024 277.367 -4.97 1.105 – – –
Hunt & Reffert 2023 277.362 -4.982 1.11 0.827 -2.589 10.616
Almeida et al. 2023 277.378 -5.026 – – – –
He et al. 2022 277.36 -4.977 1.09 0.857 -2.559 –
Tarricq et al. 2022 277.346 -4.977 1.089 0.871 -2.558 –
Dias et al. 2021 277.359 -4.984 1.1 0.778 -2.504 –
Cantat-Gaudin et al. 2020 277.352 -4.974 1.109 0.772 -2.511 –
Cantat-Gaudin & Anders 2020 277.351 -4.973 1.102 0.785 -2.531 –
Sim et al. 2019 277.358 -4.987 – 0.81 -2.49 –

💡 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 0.52 2.85 – 802 -0.169 – – –
Almeida et al. 2025 0.84 3.13 – 42 – 269 – –
Alfonso et al. 2024 0.93 2.88 – 158 0.351 – – –
Hunt & Reffert 2024 – – – – – 469* – –
Cavallo et al. 2024 1.00 3.74 – 29 0.230 – – –
Hunt & Reffert 2023 0.87 3.71 2.02 54 – – – –
Almeida et al. 2023 0.88 3.25 – 29 0.162 270* 0.59 –
He et al. 2022 – 4.00 – 28 – – – –
Tarricq et al. 2022 0.91 – – 191 – – – –
Dias et al. 2021 0.84 3.13 – 42 0.351 – – –
Cantat-Gaudin et al. 2020 0.93 2.88 – 166 – – – –
Cantat-Gaudin & Anders 2020 0.88 – – – – – – –
Sim et al. 2019 0.88 – – 794 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 351 100.0 277.36 -4.99 1.09 0.8 -2.56 -7.46 0.14
CWWDL 14201 60.9 277.35 -4.97 1.09 0.8 -2.55 -7.28 0.0

💡 Note: The % column shows the percentage of members that UPK 28 shares with each listed object.

Visualization
ℹī¸
UPK 28 UCC
UPK 28 HUNT23
UPK 28 CANTAT20
Galactocentric position diagram