HSC 691
0.15
UTI
0.0
CN
0.23
Cdens
0.5
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
20.9 [arcmin]
- CN 0.0 Sparse
- Cdens 0.23 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 691 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low 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.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
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.
Close
Low extinction
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 324.355 | 40.445 | 1.409 | 1.518 | -2.374 | -2.502 |
| Zhang et al. | 2024 | 324.407 | 40.395 | â | â | â | â |
| Cavallo et al. | 2024 | 324.29 | 40.556 | 1.406 | â | â | â |
| Hunt & Reffert | 2023 | 324.407 | 40.395 | 1.398 | 1.555 | -2.383 | -3.194 |
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 | 0.031* | â | â | â |
| Cavallo et al. | 2024 | 0.75 | 0.49 | â | 214 | 0.450 | â | â | â |
| Hunt & Reffert | 2023 | 0.69 | 0.34 | 0.42 | 142 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.