HSC 549
0.14
UTI
0.0
CN
0.08
Cdens
0.5
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
2.0 [pc], 0.4 [pc-2]
- CN 0.0 Sparse
- Cdens 0.08 Very loose
- CC3 0.5 Intermediate 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 549 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (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 | 300.59 | 31.591 | 0.222 | -2.389 | -5.455 | 5.585 |
| Hu & Soubiran | 2025 | 300.583 | 31.605 | â | â | â | â |
| Hunt & Reffert | 2024 | 300.578 | 31.597 | 0.229 | -2.382 | -5.444 | 13.226 |
| Cavallo et al. | 2024 | 300.583 | 31.605 | 0.226 | â | â | â |
| Hunt & Reffert | 2023 | 300.578 | 31.597 | 0.229 | -2.382 | -5.444 | 13.226 |
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 | 4.01 | 3.01 | 1.94 | 466 | -0.420 | 454 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.040(5) | â | â | â |
| Hunt & Reffert | 2024 | 4.01 | 3.01 | 1.94 | 466 | â | 454(1) | â | â |
| Cavallo et al. | 2024 | 4.74 | 3.07 | â | 501 | -0.800 | â | â | â |
| Hunt & Reffert | 2023 | 4.00 | 3.01 | 1.94 | 466 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.47 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.47 (50th percentile).