UBC 556

Click to load Aladin Lite
0.75 UTI
0.75
CN
1.0
Cdens
1.0
CC3
0.5
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 106
Radius (P>50% members) 3.1 [arcmin]
  • CN 0.75 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.5 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
UBC 556 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively 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.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for UBC 556 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 259.287 -41.526 0.547 0.088 -0.755 41.816
Hu & Soubiran 2025 259.285 -41.53 – – – –
Almeida et al. 2025 259.278 -41.522 – – – –
Hunt & Reffert 2024 259.289 -41.522 0.546 0.091 -0.777 28.471
Cavallo et al. 2024 259.285 -41.53 0.546 – – –
Hunt & Reffert 2023 259.289 -41.522 0.546 0.091 -0.777 28.471
Dias et al. 2021 259.278 -41.522 0.531 0.099 -0.728 –
Cantat-Gaudin et al. 2020 259.305 -41.523 0.546 0.107 -0.738 –
Castro-Ginard et al. 2020 259.282 -41.525 0.548 0.117 -0.75 –

💡 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 – – – – -0.200* – – –
Almeida et al. 2025 1.67 2.51 – 186 – 486 – –
Hunt & Reffert 2024 – – – – – 831* – –
Cavallo et al. 2024 1.64 2.73 – 513 0.050 – – –
Hunt & Reffert 2023 1.67 2.86 2.13 144 – – – –
Dias et al. 2021 1.67 2.51 – 186 0.375 – – –
Cantat-Gaudin et al. 2020 1.74 2.28 – 479 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
LISC 3180 97.2 259.29 -41.52 0.55 0.09 -0.76 1.78 0.05

💡 Note: The % column shows the percentage of members that UBC 556 shares with each listed object.

Visualization
ℹī¸
UBC 556 UCC
UBC 556 HUNT23
UBC 556 CANTAT20
Galactocentric position diagram