Theia 455
0.09
UTI
0.0
CN
0.09
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Stellar density (N50/rad)
0.4 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.09 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
Theia 455 is a sparse, very loose object of low C3 quality. Its parallax locates it at a very close distance, near 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 age and metallicity parameters (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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 138.644 | -44.187 | 2.208 | -7.042 | -0.21 | 30.042 |
| Hu & Soubiran | 2025 | 138.833 | -44.083 | â | â | â | â |
| Cavallo et al. | 2024 | 138.833 | -44.083 | 2.198 | â | â | â |
| Hunt & Reffert | 2023 | 138.306 | -44.186 | 2.198 | -7.17 | -0.049 | 28.667 |
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] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 0.455 | 0.255 | 0.56 | 493 | 0.025 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.340(5) | â | â | â |
| Cavallo et al. | 2024 | 0.47 | 0.40 | â | 813 | 0.390 | â | â | â |
| Hunt & Reffert | 2023 | 0.44 | 0.11 | 0.56 | 173 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.