Theia 366
0.36
UTI
0.64
CN
0.73
Cdens
0.75
CC3
0.3
Clit
0.67
Cdup
Stellar density (N50/rad)
3.7 [N/pc2]
- CN 0.64 Moderately populated
- Cdens 0.73 Moderately dense
- CC3 0.75 High quality
- Clit 0.3 Poorly studied
- Cdup 0.67 Likely 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 366 is a moderately populated, moderately dense object of high 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 age parameter (see Parameters). It is poorly studied in the literature.
Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 107.596 | -18.651 | 1.04 | -3.593 | 0.401 | 27.342 |
| Liu et al. | 2025 | 107.64 | -18.66 | 1.04 | -3.59 | 0.4 | 25.02 |
| Hunt & Reffert | 2024 | 107.642 | -18.66 | 1.04 | -3.588 | 0.404 | 25.023 |
| Cavallo et al. | 2024 | 107.59 | -18.638 | 1.039 | â | â | â |
| Hunt & Reffert | 2023 | 107.642 | -18.66 | 1.04 | -3.588 | 0.404 | 25.023 |
| He et al. | 2022 | 107.678 | -18.528 | 1.032 | -3.591 | 0.396 | â |
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 | 0.96 | 0.225 | 0.49 | 134 | 0.330 | 150 | â | â |
| Liu et al. | 2025 | 1.06 | 0.09 | â | 100 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 150(1) | â | â |
| Cavallo et al. | 2024 | 0.96 | 0.34 | â | 275 | 0.330 | â | â | â |
| Hunt & Reffert | 2023 | 0.91 | 0.11 | 0.49 | 168 | â | â | â | â |
| He et al. | 2022 | â | 0.40 | â | 56 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 209 along with HSC_1843, and as tidal capture (resonant trapping binary) 283 along with NGC_2358, and of multiple system 60 along with HSC_1843 and NGC_2358.
Palma et al. (2025)
Part of multiple system G215, along with HSC_1843 and NGC_2358.
Cavallo et al. (2024)
Gold sample.