HSC 1633
0.39
UTI
0.59
CN
1.0
Cdens
1.0
CC3
0.25
Clit
0.63
Cdup
Stellar density (N50/rad)
6.3 [N/pc2]
- CN 0.59 Moderately populated
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.25 Poorly studied
- Cdup 0.63 Likely 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 1633 is a moderately populated, very dense object of very high 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, very young cluster (see Parameters). It was recently reported in the literature.
Note: This is likely a unique object, which shares a moderate 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 | 80.923 | -4.497 | 2.627 | 1.876 | -1.054 | 21.379 |
| Liu et al. | 2025 | 80.75 | -4.58 | 2.63 | 1.84 | -1.04 | 14.8 |
| Zhang et al. | 2024 | 80.753 | -4.581 | â | â | â | â |
| Cavallo et al. | 2024 | 80.893 | -4.41 | 2.632 | â | â | â |
| Hunt & Reffert | 2023 | 80.753 | -4.581 | 2.634 | 1.845 | -1.041 | 14.802 |
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 | 0.39 | 0.32 | 0.89 | 6 | -0.146 | â | â | â |
| Liu et al. | 2025 | 0.41 | 0.16 | â | 12 | â | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.072(1) | â | â | â |
| Cavallo et al. | 2024 | 0.39 | 0.87 | â | 4 | -0.220 | â | â | â |
| Hunt & Reffert | 2023 | 0.37 | 0.32 | 0.89 | 6 | 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 202 along with NGC_1980, and as primordial binary cluster 319 along with OCSN_59, and of multiple system 57 along with NGC_1980 and OCSN_59.
Palma et al. (2025)
Part of multiple system G124, along with NGC_1980 and OCSN_59.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.