Theia 833
0.11
UTI
0.0
CN
0.06
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
2.4 [pc], 0.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.06 Very loose
- CC3 0.38 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 833 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, above 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 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 | 297.323 | 38.593 | 1.428 | 1.132 | -0.012 | -18.952 |
| Hu & Soubiran | 2025 | 297.324 | 38.644 | â | â | â | â |
| Cavallo et al. | 2024 | 297.324 | 38.644 | 1.445 | â | â | â |
| Hunt & Reffert | 2023 | 297.39 | 38.569 | 1.43 | 1.094 | 0.005 | -21.067 |
| Kounkel & Covey | 2019 | 297.721 | 39.861 | 2.092 | â | â | -3.104 |
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 | 0.68 | 0.19 | 0.46 | 430 | 0.120 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.130(5) | â | â | â |
| Cavallo et al. | 2024 | 0.68 | 0.19 | â | 933 | 0.370 | â | â | â |
| Hunt & Reffert | 2023 | 0.68 | 0.15 | 0.46 | 169 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.48 | 0.29 | â | 430 | 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).