HSC 618
0.11
UTI
0.0
CN
0.04
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
20
Core radius and density
1.2 [pc], 0.2 [pc-2]
- CN 0.0 Sparse
- Cdens 0.04 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 618 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the age and metallicity parameters (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 | 306.937 | 40.025 | 1.028 | -2.057 | -4.036 | -18.996 |
| Zhang et al. | 2024 | 306.745 | 40.053 | â | â | â | â |
| Hunt & Reffert | 2024 | 306.745 | 40.053 | 1.015 | -1.997 | -3.963 | -17.33 |
| Cavallo et al. | 2024 | 306.929 | 40.021 | 1.026 | â | â | â |
| Hunt & Reffert | 2023 | 306.745 | 40.053 | 1.015 | -1.997 | -3.963 | -17.33 |
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 | 0.95 | 1.66 | 1.96 | 6 | 0.021 | 87 | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.192(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.95 | 1.66 | 1.96 | 6 | â | 87(1) | â | â |
| Cavallo et al. | 2024 | 1.77 | 1.76 | â | 44 | -0.150 | â | â | â |
| Hunt & Reffert | 2023 | 0.95 | 1.66 | 1.96 | 6 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G185, along with HSC_616 and OC_0115.
Cavallo et al. (2024)
Wood sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.31 (50th percentile), true positive? (human-assigned).
Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.31 (50th percentile), true positive? (human-assigned).