HSC 1021
0.26
UTI
0.28
CN
0.02
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
28
Core radius and density
6.8 [pc], 0.1 [pc-2]
- CN 0.28 Poorly populated
- Cdens 0.02 Very loose
- CC3 0.75 High quality
- Clit 0.13 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 1021 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It was recently reported in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
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 | 20.544 | 57.237 | 0.256 | -2.117 | -1.091 | -62.619 |
| Hu & Soubiran | 2025 | 20.546 | 57.249 | â | â | â | â |
| Yang et al. | 2025 | 20.674 | 57.221 | â | â | â | â |
| Zhang et al. | 2024 | 20.674 | 57.221 | â | â | â | â |
| Hunt & Reffert | 2024 | 20.674 | 57.221 | 0.258 | -2.08 | -1.097 | -55.353 |
| Cavallo et al. | 2024 | 20.546 | 57.249 | 0.255 | â | â | â |
| Hunt & Reffert | 2023 | 20.674 | 57.221 | 0.258 | -2.08 | -1.097 | -55.353 |
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 | 3.43 | 1.25 | 1.68 | 469 | -0.140 | 130 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.170(5) | â | â | â |
| Yang et al. | 2025 | â | â | â | 468 | -0.110(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.254(1) | â | â | â |
| Hunt & Reffert | 2024 | 3.43 | 1.25 | 1.68 | 469 | â | 130(1) | â | â |
| Cavallo et al. | 2024 | 3.08 | 1.19 | â | 617 | 0.030 | â | â | â |
| Hunt & Reffert | 2023 | 3.43 | 1.25 | 1.68 | 469 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.96 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).