Theia 236
0.15
UTI
0.0
CN
0.11
Cdens
0.5
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
2.5 [pc], 0.5 [pc-2]
- CN 0.0 Sparse
- Cdens 0.11 Very loose
- CC3 0.5 Intermediate 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 236 is a sparse, very loose object of intermediate 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, young cluster, but with a large variance across recent sources for the distance and age 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 | 287.278 | 13.368 | 2.924 | 1.203 | -9.824 | -12.583 |
| Cavallo et al. | 2024 | 287.596 | 13.536 | 2.91 | â | â | â |
| Hunt & Reffert | 2023 | 287.374 | 13.511 | 2.922 | 1.154 | -9.802 | -9.097 |
| Kounkel & Covey | 2019 | 286.106 | 12.472 | 2.536 | â | â | 21.323 |
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 | 0.4 | 0.685 | 0.43 | 63 | 0.400 | â | â | â |
| Liu et al. | 2025 | 1.19 | 0.66 | â | 8 | â | â | â | â |
| Cavallo et al. | 2024 | 0.36 | 0.99 | â | 47 | 0.400 | â | â | â |
| Hunt & Reffert | 2023 | 0.34 | 0.71 | 0.43 | 79 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.44 | 0.54 | â | 84 | â | â | â | â |
Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 329 along with PHOC_40.
Palma et al. (2025)
Classified as optical pair P563, along with PHOC_40.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.96 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.96 (50th percentile).