HSC 2145
0.19
UTI
0.25
CN
0.13
Cdens
0.38
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
25
Core radius and density
2.2 [pc], 0.7 [pc-2]
- CN 0.25 Poorly populated
- Cdens 0.13 Very loose
- CC3 0.38 Low quality
- Clit 0.1 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
HSC 2145 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near 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 age parameter (see Parameters). It was recently reported in the literature.
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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 131.564 | -47.001 | 0.6 | -7.002 | 3.993 | 52.07 |
| Liu et al. | 2025 | 131.52 | -46.99 | 0.6 | -7.02 | 4.01 | 34.84 |
| Hu & Soubiran | 2025 | 131.553 | -46.971 | â | â | â | â |
| Hunt & Reffert | 2024 | 131.515 | -46.992 | 0.598 | -7.022 | 4.013 | 34.844 |
| Cavallo et al. | 2024 | 131.553 | -46.971 | 0.599 | â | â | â |
| Hunt & Reffert | 2023 | 131.515 | -46.992 | 0.598 | -7.022 | 4.013 | 34.844 |
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] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 1.635 | 0.89 | 0.98 | 126 | -0.095 | 127 | â | â |
| Liu et al. | 2025 | 2.32 | 0.36 | â | 98 | â | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.200(5) | â | â | â |
| Hunt & Reffert | 2024 | 1.58 | 0.89 | 0.98 | 126 | â | 127(1) | â | â |
| Cavallo et al. | 2024 | 1.69 | 0.96 | â | 562 | 0.010 | â | â | â |
| Hunt & Reffert | 2023 | 1.58 | 0.89 | 0.98 | 126 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 221 along with Theia_1742, and of multiple system 63 along with UBC_1621 and Theia_1742.
Palma et al. (2025)
Part of multiple system G139, along with Theia_1742 and UBC_1621.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).