Theia 618
0.10
UTI
0.0
CN
0.24
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Stellar density (N50/rad)
1.2 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.24 Very loose
- CC3 0.25 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 618 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, below 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 4.97 | 55.705 | 1.386 | 0.187 | -4.939 | -12.884 |
| Hu & Soubiran | 2025 | 4.992 | 55.58 | â | â | â | â |
| Cavallo et al. | 2024 | 4.992 | 55.58 | 1.389 | â | â | â |
| Hunt & Reffert | 2023 | 5.286 | 55.784 | 1.382 | 0.192 | -5.079 | -7.607 |
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 | 0.695 | 0.645 | 0.24 | 540 | -0.050 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.100(5) | â | â | â |
| Cavallo et al. | 2024 | 0.70 | 0.64 | â | 813 | 0.000 | â | â | â |
| Hunt & Reffert | 2023 | 0.69 | 0.65 | 0.24 | 266 | 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.