HSC 1555
0.18
UTI
0.62
CN
0.05
Cdens
0.12
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
73
Core radius and density
6.5 [pc], 0.2 [pc-2]
- CN 0.62 Moderately populated
- Cdens 0.05 Very loose
- CC3 0.12 Very 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 1555 is a moderately populated, very loose object of very low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age 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 | 130.611 | 24.345 | 5.466 | -17.445 | -21.176 | 21.766 |
| Yang et al. | 2025 | 126.244 | 27.225 | â | â | â | â |
| Zhang et al. | 2024 | 126.244 | 27.225 | â | â | â | â |
| Cavallo et al. | 2024 | 128.944 | 25.539 | 5.568 | â | â | â |
| Hunt & Reffert | 2023 | 126.244 | 27.225 | 5.596 | -17.025 | -21.206 | 23.634 |
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 | 0.175 | 0.265 | 0.47 | 129 | 0.117 | â | â | â |
| Yang et al. | 2025 | â | â | â | 129 | 0.010(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.117(1) | â | â | â |
| Cavallo et al. | 2024 | 0.18 | 0.39 | â | 148 | 0.170 | â | â | â |
| Hunt & Reffert | 2023 | 0.17 | 0.14 | 0.47 | 128 | 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 P434, along with NGC_2632.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).