Theia 224
0.12
UTI
0.25
CN
0.02
Cdens
0.12
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
25
Core radius and density
1.9 [pc], 0.08 [pc-2]
- CN 0.25 Poorly populated
- Cdens 0.02 Very loose
- CC3 0.12 Very low quality
- Clit 0.1 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 224 is a poorly populated, very loose object of very low C3 quality. Its parallax locates it at a very close distance, below 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 metallicity parameter (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 | 83.341 | 5.186 | 3.365 | -5.33 | -7.088 | 16.864 |
| Yang et al. | 2025 | 83.038 | 5.15 | â | â | â | â |
| Zhang et al. | 2024 | 83.038 | 5.15 | â | â | â | â |
| Cavallo et al. | 2024 | 84.115 | 5.762 | 3.351 | â | â | â |
| Hunt & Reffert | 2023 | 83.038 | 5.15 | 3.35 | -5.462 | -7.008 | 23.67 |
| Kounkel & Covey | 2019 | 84.185 | 5.689 | 3.473 | â | â | -1.218 |
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 | 0.29 | 0.16 | 0.44 | 154 | -0.008 | â | â | â |
| Yang et al. | 2025 | â | â | â | 155 | -0.070(3) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.008(1) | â | â | â |
| Cavallo et al. | 2024 | 0.31 | 0.58 | â | 224 | 0.240 | â | â | â |
| Hunt & Reffert | 2023 | 0.29 | 0.09 | 0.44 | 154 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.29 | 0.16 | â | 92 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair P617, along with CWNU_1142.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.90 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.90 (50th percentile).