Theia 818
0.04
UTI
0.0
CN
0.09
Cdens
0.12
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
61.9 [arcmin]
- CN 0.0 Sparse
- Cdens 0.09 Very loose
- CC3 0.12 Very low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
Theia 818 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young 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.
Very close
Moderate extinction
Near-solar metallicity
Young
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 74.085 | 13.917 | 2.464 | 5.451 | -4.101 | 10.153 |
| Zhang et al. | 2024 | 73.756 | 13.687 | â | â | â | â |
| Cavallo et al. | 2024 | 73.73 | 14.458 | 2.408 | â | â | â |
| Hunt & Reffert | 2023 | 73.756 | 13.687 | 2.425 | 5.459 | -4.187 | 10.297 |
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 | 0.011* | â | â | â |
| Cavallo et al. | 2024 | 0.43 | 1.36 | â | 37 | -0.350 | â | â | â |
| Hunt & Reffert | 2023 | 0.39 | 0.88 | 0.50 | 138 | 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.