HSC 638
0.19
UTI
0.32
CN
0.11
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
32
Core radius and density
1.9 [pc], 0.6 [pc-2]
- CN 0.32 Poorly populated
- Cdens 0.11 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 638 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near 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 | 310.422 | 41.707 | 0.968 | 2.528 | -2.582 | -11.22 |
| Zhang et al. | 2024 | 310.356 | 41.665 | â | â | â | â |
| Hunt & Reffert | 2024 | 310.357 | 41.665 | 0.979 | 2.499 | -2.567 | -19.113 |
| Cavallo et al. | 2024 | 310.346 | 41.792 | 0.971 | â | â | â |
| Hunt & Reffert | 2023 | 310.357 | 41.665 | 0.979 | 2.499 | -2.567 | -19.113 |
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 | 1.0 | 3.11 | 1.91 | 136 | -0.198 | 54 | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.035(1) | â | â | â |
| Hunt & Reffert | 2024 | 1.00 | 3.11 | 1.91 | 136 | â | 54(1) | â | â |
| Cavallo et al. | 2024 | 1.05 | 3.25 | â | 105 | -0.360 | â | â | â |
| Hunt & Reffert | 2023 | 1.00 | 3.11 | 1.91 | 136 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Silver sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.33 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.33 (50th percentile).