UPK 27

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0.82 UTI
0.72
CN
1.0
Cdens
1.0
CC3
0.7
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 94
Radius (P>50% members) 10.3 [arcmin]
  • CN 0.72 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.7 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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UPK 27 is a moderately populated, very dense object of very 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, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

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

Close High extinction Near-solar metallicity Intermediate age

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 27 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 275.045 -5.168 1.087 2.361 -2.202 -29.483
Hu & Soubiran 2025 275.034 -5.194 – – – –
Almeida et al. 2025 275.062 -5.171 – – – –
Alfonso et al. 2024 275.049 -5.167 1.049 2.355 -2.208 –
Hunt & Reffert 2024 275.06 -5.146 1.081 2.379 -2.199 -29.822
Cavallo et al. 2024 275.034 -5.194 1.08 – – –
Hunt & Reffert 2023 275.06 -5.146 1.081 2.379 -2.199 -29.822
He et al. 2022 275.057 -5.127 1.09 2.352 -2.182 –
Tarricq et al. 2022 275.063 -5.167 1.083 2.357 -2.191 –
Dias et al. 2021 275.062 -5.171 1.077 2.399 -2.124 -31.303
Cantat-Gaudin et al. 2020 275.051 -5.167 1.088 2.381 -2.116 –
Cantat-Gaudin & Anders 2020 275.05 -5.163 1.082 2.378 -2.092 –
Sim et al. 2019 275.075 -5.147 – 2.36 -2.14 –

💡 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
Hu & Soubiran 2025 – – – – 0.250* – – –
Almeida et al. 2025 0.91 3.52 – 695 – 332 – –
Alfonso et al. 2024 0.92 2.27 – 1100 0.026 – – –
Hunt & Reffert 2024 – – – – – 335* – –
Cavallo et al. 2024 1.04 4.08 – 676 0.370 – – –
Hunt & Reffert 2023 0.86 4.09 2.66 701 – – – –
He et al. 2022 – 4.60 – 398 – – – –
Tarricq et al. 2022 0.90 – – 1660 – – – –
Dias et al. 2021 0.91 3.52 – 695 0.026 – – –
Cantat-Gaudin et al. 2020 0.92 2.27 – 1622 – – – –
Cantat-Gaudin & Anders 2020 0.90 – – – – – – –
Sim et al. 2019 0.90 – – 2239 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 348 100.0 275.04 -5.17 1.09 2.36 -2.2 -29.48 0.01

💡 Note: The % column shows the percentage of members that UPK 27 shares with each listed object.

Visualization
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UPK 27 UCC
UPK 27 HUNT23
UPK 27 CANTAT20
Galactocentric position diagram