HSC 640
0.48
UTI
0.81
CN
1.0
Cdens
0.75
CC3
0.25
Clit
0.78
Cdup
Radius (P>50% members)
7.4 [arcmin]
- CN 0.81 Rich
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.25 Poorly studied
- Cdup 0.78 Very likely unique
Overview
HSC 640 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.
Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.
Relatively close
High extinction
Massive
Near-solar metallicity
Very young
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 309.736 | 42.147 | 0.678 | -2.319 | -3.43 | 1.133 |
| Zhang et al. | 2024 | 309.774 | 42.12 | â | â | â | â |
| Hunt & Reffert | 2024 | 309.774 | 42.12 | 0.654 | -2.356 | -3.44 | 11.588 |
| Cavallo et al. | 2024 | 309.557 | 42.408 | 0.65 | â | â | â |
| Hunt & Reffert | 2023 | 309.774 | 42.12 | 0.654 | -2.356 | -3.44 | 11.588 |
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] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Zhang et al. | 2024 | â | â | â | â | -0.102* | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 1795* | â | â |
| Cavallo et al. | 2024 | 1.70 | 4.43 | â | 16 | 0.620 | â | â | â |
| Hunt & Reffert | 2023 | 1.49 | 5.05 | 3.09 | 14 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Wood sample.