Theia 411
0.11
UTI
0.0
CN
0.18
Cdens
0.25
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
19
Core radius and density
1.2 [pc], 0.9 [pc-2]
- CN 0.0 Sparse
- Cdens 0.18 Very loose
- CC3 0.25 Low quality
- Clit 0.06 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 411 is a sparse, 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, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is rarely studied 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 | 155.207 | -60.749 | 1.409 | -9.91 | 6.263 | 0.248 |
| Hu & Soubiran | 2025 | 155.311 | -60.691 | â | â | â | â |
| Cavallo et al. | 2024 | 155.311 | -60.691 | 1.432 | â | â | â |
| Hunt & Reffert | 2023 | 155.234 | -60.684 | 1.434 | -9.83 | 6.31 | -2.751 |
| Kounkel & Covey | 2019 | 154.806 | -60.209 | 1.323 | â | â | -11.481 |
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 | 0.71 | 0.25 | 1.0 | 127 | 0.225 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.260(5) | â | â | â |
| Cavallo et al. | 2024 | 0.71 | 0.00 | â | 550 | 0.710 | â | â | â |
| Hunt & Reffert | 2023 | 0.66 | 0.25 | 1.00 | 97 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.76 | 0.33 | â | 127 | 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 moving group. CMD class: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).