HSC 921
0.16
UTI
0.0
CN
0.11
Cdens
0.5
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
1.9 [pc], 0.5 [pc-2]
- CN 0.0 Sparse
- Cdens 0.11 Very loose
- CC3 0.5 Intermediate 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 921 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (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 | 5.302 | 30.936 | 5.85 | 14.349 | -2.948 | 6.431 |
| Yang et al. | 2025 | 5.513 | 30.88 | â | â | â | â |
| Zhang et al. | 2024 | 5.514 | 30.88 | â | â | â | â |
| Swiggum et al. | 2024 | 5.514 | 30.88 | 5.755 | 14.005 | -2.698 | 5.084 |
| Cavallo et al. | 2024 | 3.965 | 31.658 | 5.78 | â | â | â |
| Hunt & Reffert | 2023 | 5.514 | 30.88 | 5.755 | 14.005 | -2.698 | 2.341 |
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 | 0.17 | 0.205 | 0.55 | 43 | 0.000 | 86 | â | â |
| Yang et al. | 2025 | â | â | â | 43 | 0.010(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.007(1) | â | â | â |
| Swiggum et al. | 2024 | 0.17 | â | â | 43 | â | 86 | â | â |
| Cavallo et al. | 2024 | 0.17 | 0.30 | â | 18 | 0.000 | â | â | â |
| Hunt & Reffert | 2023 | 0.17 | 0.11 | 0.55 | 43 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P526, along with HSC_778.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.54 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.54 (50th percentile).