UPK 552

(OCSN 315)

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0.72 UTI
0.37
CN
1.0
Cdens
0.75
CC3
0.75
Clit
1.0
Cdup
C3 classification BA
Number of members (P>50%) 37
Radius (P>50% members) 27.6 [arcmin]
  • CN 0.37 Poorly 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 552 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a very close distance, above 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 absorption, age, and metallicity parameters (see Parameters). It is well-studied in the literature.
Very close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as a moving group.

Data
🔍 Search references for UPK 552 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 158.498 -47.229 3.074 -22.479 6.497 4.749
Li et al. 2025 158.509 -47.263 3.056 -22.634 6.34 –
Almeida et al. 2025 158.547 -47.243 – – – –
Alfonso et al. 2024 158.395 -47.18 3.049 -22.519 6.595 –
Cavallo et al. 2024 158.908 -47.225 3.169 – – –
Hunt & Reffert 2023 158.46 -46.986 3.166 -23.087 6.501 3.594
Almeida et al. 2023 158.628 -47.422 – – – –
Qin et al. 2023 158.39 -47.08 3.07 -22.57 6.45 9.18
He et al. 2022 158.302 -47.082 3.076 -22.516 6.572 –
Tarricq et al. 2022 158.54 -47.106 3.071 -22.444 6.359 –
Dias et al. 2021 158.547 -47.243 3.048 -22.57 6.35 7.675
Cantat-Gaudin et al. 2020 158.509 -47.263 3.056 -22.634 6.34 –
Cantat-Gaudin & Anders 2020 158.509 -47.263 3.066 -22.561 6.38 –
Sim et al. 2019 158.704 -47.287 – -22.45 6.31 –

💡 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 0.33 0.19 – 96 -0.032 – – –
Almeida et al. 2025 0.32 0.13 – 192 – 45 – –
Alfonso et al. 2024 0.33 0.00 – 75 -0.040 – – –
Cavallo et al. 2024 0.33 0.36 – 65 0.380 – – –
Hunt & Reffert 2023 0.30 0.08 0.34 108 – – – –
Almeida et al. 2023 0.33 0.10 – 274 0.006 95* 0.68 –
Qin et al. 2023 0.34 0.22 – 79 – – – –
He et al. 2022 – 0.35 – 71 – – – –
Tarricq et al. 2022 0.32 – – 120 – – – –
Dias et al. 2021 0.32 0.13 – 192 -0.040 – – –
Cantat-Gaudin et al. 2020 0.33 0.00 – 117 – – – –
Cantat-Gaudin & Anders 2020 0.32 – – – – – – –
Sim et al. 2019 0.34 – – 89 – – – –

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

Visualization
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UPK 552 UCC
UPK 552 HUNT23
UPK 552 CANTAT20
Galactocentric position diagram