Theia 256
0.16
UTI
0.25
CN
0.19
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
32.2 [arcmin]
- CN 0.25 Poorly populated
- Cdens 0.19 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
Theia 256 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, above 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.
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 | 123.788 | 7.189 | 1.821 | -8.191 | -1.281 | 18.11 |
| Zhang et al. | 2024 | 123.759 | 7.061 | â | â | â | â |
| Cavallo et al. | 2024 | 123.773 | 7.268 | 1.811 | â | â | â |
| Hunt & Reffert | 2023 | 123.759 | 7.061 | 1.814 | -8.13 | -1.303 | 30.697 |
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 | -0.104* | â | â | â |
| Cavallo et al. | 2024 | 0.56 | 0.08 | â | 129 | 0.280 | â | â | â |
| Hunt & Reffert | 2023 | 0.53 | 0.05 | 0.37 | 88 | 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.