Theia 222
0.30
UTI
0.62
CN
0.14
Cdens
0.62
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
73
Core radius and density
3.8 [pc], 0.7 [pc-2]
- CN 0.62 Moderately populated
- Cdens 0.14 Very loose
- CC3 0.62 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 222 is a moderately populated, 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, intermediate-age cluster (see Parameters). It is rarely studied in the literature.
Note: This object shares a significant percentage of members with a later 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 | 286.448 | -16.074 | 4.034 | 0.767 | -11.099 | -23.969 |
| Cavallo et al. | 2024 | 285.998 | -16.478 | 4.011 | â | â | â |
| Hunt & Reffert | 2023 | 286.569 | -15.608 | 4.022 | 0.668 | -11.246 | -25.718 |
| Kounkel & Covey | 2019 | 285.924 | -16.406 | 3.612 | â | â | -6.125 |
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 | 0.27 | 0.22 | 0.55 | 100 | 0.220 | â | â | â |
| Liu et al. | 2025 | 0.30 | 0.17 | â | 93 | â | â | â | â |
| Cavallo et al. | 2024 | 0.26 | 0.73 | â | 105 | 0.220 | â | â | â |
| Hunt & Reffert | 2023 | 0.25 | 0.19 | 0.55 | 142 | â | â | â | â |
| Kounkel & Covey | 2019 | 0.28 | 0.25 | â | 95 | â | â | â | â |
Liu et al. (2025)
Classified as primordial binary cluster 162 along with HSC_180.
Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P443, along with HSC_180.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).