Theia 189
0.17
UTI
0.25
CN
0.21
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
18.1 [arcmin]
- CN 0.25 Poorly populated
- Cdens 0.21 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
Theia 189 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (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 | 97.828 | 5.423 | 1.087 | -1.673 | -3.376 | 22.844 |
| Zhang et al. | 2024 | 97.787 | 5.431 | â | â | â | â |
| Cavallo et al. | 2024 | 97.817 | 6.07 | 1.08 | â | â | â |
| Hunt & Reffert | 2023 | 97.787 | 5.431 | 1.079 | -1.586 | -3.408 | 20.861 |
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 | -0.091* | â | â | â |
| Cavallo et al. | 2024 | 0.84 | 0.64 | â | 219 | -0.320 | â | â | â |
| Hunt & Reffert | 2023 | 0.87 | 0.21 | 0.58 | 252 | 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.