Theia 903
0.15
UTI
0.26
CN
0.13
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
22.4 [arcmin]
- CN 0.26 Poorly populated
- Cdens 0.13 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
Theia 903 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 moderate 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
Moderate 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 | 215.209 | -58.081 | 1.034 | -1.959 | -3.836 | 10.729 |
| Hu & Soubiran | 2025 | 214.915 | -58.021 | â | â | â | â |
| Cavallo et al. | 2024 | 214.914 | -58.021 | 1.029 | â | â | â |
| Hunt & Reffert | 2023 | 215.242 | -58.075 | 1.026 | -1.915 | -3.793 | 4.476 |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Hu & Soubiran | 2025 | â | â | â | â | -0.250* | â | â | â |
| Cavallo et al. | 2024 | 0.87 | 1.35 | â | 589 | -0.710 | â | â | â |
| Hunt & Reffert | 2023 | 0.91 | 0.80 | 1.36 | 113 | 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.