HSC 166
0.05
UTI
0.0
CN
0.02
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
5.6 [arcmin]
- CN 0.0 Sparse
- Cdens 0.02 Very loose
- CC3 0.25 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 166 is a sparse, very loose object of low C3 quality. Its parallax locates it at a large* distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, old cluster (see Parameters). It was recently reported in the literature.
(*): The parallax distance estimate (~7.92 kpc) differs significantly from the median photometric distance (~5.29 kpc).
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Very distant
Moderate extinction
Near-solar metallicity
Old
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 278.63 | -20.299 | 0.126 | -0.817 | -5.785 | 84.432 |
| Hu & Soubiran | 2025 | 278.61 | -20.293 | â | â | â | â |
| Cavallo et al. | 2024 | 278.609 | -20.293 | 0.13 | â | â | â |
| Hunt & Reffert | 2023 | 278.641 | -20.241 | 0.131 | -0.786 | -5.72 | 69.513 |
đĄ 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 | â | â | â | â | -0.100* | â | â | â |
| Cavallo et al. | 2024 | 4.72 | 2.01 | â | 5370 | -0.150 | â | â | â |
| Hunt & Reffert | 2023 | 5.87 | 2.80 | 1.34 | 1563 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.