HSC 446
0.12
UTI
0.0
CN
0.12
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
1.8 [pc], 0.6 [pc-2]
- CN 0.0 Sparse
- Cdens 0.12 Very loose
- CC3 0.38 Low quality
- Clit 0.06 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 446 is a sparse, very loose object of low 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 absorption 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 | 290.043 | 20.821 | 1.271 | -1.398 | -3.047 | -2.814 |
| Liu et al. | 2025 | 290.03 | 20.82 | 1.27 | -1.39 | -3.04 | -4.96 |
| Hunt & Reffert | 2024 | 290.026 | 20.823 | 1.269 | -1.388 | -3.039 | -4.957 |
| Cavallo et al. | 2024 | 290.051 | 20.795 | 1.262 | â | â | â |
| Hunt & Reffert | 2023 | 290.026 | 20.823 | 1.269 | -1.388 | -3.039 | -4.957 |
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 | 0.875 | 3.5 | 2.45 | 268 | 0.430 | 79 | â | â |
| Liu et al. | 2025 | 2.21 | 1.03 | â | 102 | â | â | â | â |
| Hunt & Reffert | 2024 | 0.78 | 3.50 | 2.45 | 296 | â | 79(1) | â | â |
| Cavallo et al. | 2024 | 0.97 | 4.51 | â | 240 | 0.430 | â | â | â |
| Hunt & Reffert | 2023 | 0.78 | 3.50 | 2.45 | 296 | 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 353 along with Theia_978, and of multiple system 81 along with UPK_65 and Theia_978.
Palma et al. (2025)
Part of multiple system G178, along with HSC_437, UPK_56, UPK_65 and Theia_978.
Cavallo et al. (2024)
Silver sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.80 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.80 (50th percentile).