HSC 2550
0.14
UTI
0.0
CN
0.17
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
1.1 [pc], 0.9 [pc-2]
- CN 0.0 Sparse
- Cdens 0.17 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 2550 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate 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 | 195.106 | -62.381 | 0.507 | -5.079 | -1.79 | â |
| Liu et al. | 2025 | 195.11 | -62.4 | 0.52 | -5.09 | -1.78 | â |
| Hunt & Reffert | 2024 | 195.108 | -62.397 | 0.516 | -5.092 | -1.784 | â |
| Cavallo et al. | 2024 | 195.089 | -62.405 | 0.514 | â | â | â |
| Hunt & Reffert | 2023 | 195.108 | -62.397 | 0.516 | -5.092 | -1.784 | â |
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 | 1.84 | 2.23 | 1.86 | 20 | -0.370 | 368 | â | â |
| Liu et al. | 2025 | 4.27 | 0.81 | â | 25 | â | â | â | â |
| Hunt & Reffert | 2024 | 1.84 | 2.23 | 1.86 | 15 | â | 368(1) | â | â |
| Cavallo et al. | 2024 | 1.70 | 2.49 | â | 37 | -0.370 | â | â | â |
| Hunt & Reffert | 2023 | 1.84 | 2.23 | 1.86 | 15 | 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 236 along with OC_0587, and of multiple system 27 along with OC_0587 and CWNU_490.
Palma et al. (2025)
Part of multiple system G159, along with CWNU_490 and OC_0587.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.93 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.93 (50th percentile).