HSC 381
0.31
UTI
0.27
CN
0.08
Cdens
0.75
CC3
0.25
Clit
0.96
Cdup
Nm (P>50%)
27
Core radius and density
2.5 [pc], 0.4 [pc-2]
- CN 0.27 Poorly populated
- Cdens 0.08 Very loose
- CC3 0.75 High quality
- Clit 0.25 Poorly studied
- Cdup 0.96 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 381 is a poorly populated, very loose object of high 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, young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It was recently reported in the literature.
Note: This is a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 270.961 | 19.467 | 3.227 | -1.162 | -8.033 | -16.73 |
| Yang et al. | 2025 | 271.386 | 17.771 | â | â | â | â |
| Zhang et al. | 2024 | 271.386 | 17.771 | â | â | â | â |
| Swiggum et al. | 2024 | 271.386 | 17.771 | 3.161 | -1.036 | -8.11 | -17.463 |
| Cavallo et al. | 2024 | 270.773 | 19.135 | 3.178 | â | â | â |
| Hunt & Reffert | 2023 | 271.386 | 17.771 | 3.161 | -1.036 | -8.11 | -17.045 |
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 | 0.315 | 0.21 | 0.83 | 31 | -0.050 | 296 | â | â |
| Liu et al. | 2025 | 0.33 | 0.06 | â | 41 | â | â | â | â |
| Yang et al. | 2025 | â | â | â | 31 | -0.160(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.034(1) | â | â | â |
| Swiggum et al. | 2024 | 0.31 | â | â | 31 | â | 296 | â | â |
| Cavallo et al. | 2024 | 0.32 | 0.66 | â | 17 | -0.050 | â | â | â |
| Hunt & Reffert | 2023 | 0.31 | 0.21 | 0.83 | 31 | 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 168 along with HSC_415.
Palma et al. (2025)
Classified as genetic pair P614, along with HSC_415.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.96 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).